The Relaxed Body Recumbent E-Trike, Measured: A Complete Guide to Its Fit, Dimensions, and Design

Numbers rarely make for exciting reading, yet on a three-wheeled electric trike they tell you nearly everything you need to know before you ever throw a leg over the frame. Seat height decides whether you can plant both feet flat at a stoplight. Step-over height decides whether mounting is a smooth glide or an awkward climb. The distance between the saddle and the handlebar grips decides whether your back stays relaxed for an hour or whether you spend the whole ride reaching. On the new Relaxed Body recumbent electric trike from sixthreezero, those measurements were not an afterthought — they were the entire point of the design.

In a recent walkthrough, sixthreezero CEO Dustin measured the trike from nose to tail, showing exactly how its dimensions translate into real-world fit. What emerged was a portrait of an unusually flexible machine: one that can genuinely accommodate a rider who stands four-foot-ten just as comfortably as a rider who stands six-foot-five. That range is rare in the world of recumbent e-trikes, and it comes down to a handful of deliberate engineering choices. This guide breaks down each of those measurements, explains why they matter, and shows how they add up to a ride that feels tailored rather than tolerated.

Before diving into the specifics, it is worth pausing on why fit deserves this much attention in the first place. A trike that fits well disappears beneath you. You stop thinking about the machine and start thinking about the ride — the breeze, the route, the destination. A trike that fits poorly does the opposite. It nags at you: a knee that aches after a mile, a lower back that tightens on the way home, a reach to the bars that leaves your shoulders tense. The frustrating part is that these problems are almost always solvable with the right adjustments, yet most trikes simply do not offer enough range to solve them. The Relaxed Body was built to be the exception, and understanding its measurements is the fastest way to see how.

Think of the sections that follow as a tour of the trike conducted through its numbers. Each measurement answers a practical question a real rider would ask: Can I get on it easily? Can I put my feet down? Will my legs reach the pedals comfortably? Will my back stay relaxed? Can I store it, transport it, and carry my things on it? By the end, you will have a complete sense of whether this trike suits your body and your life — and, just as importantly, why.

A Different Kind of Electric Trike

Most electric trikes ask you to sit upright and pedal directly beneath your body, the same posture you would find on a traditional bicycle. The Relaxed Body takes a different path. It uses an elongated frame and a forward-pedaling layout, which means the pedals sit out in front of you rather than below you. This is the defining trait of a recumbent — or, more precisely, a semi-recumbent — design, and it changes the entire character of the ride. Instead of hunching forward over the bars, you settle back into a low, relaxed seating position with your legs extended ahead of you.

That posture does more than look comfortable. Extending your legs forward allows for a fuller, more natural range of motion through each pedal stroke while keeping you lower to the ground. The result is reduced pressure on the knees and hips, a lower center of gravity, and a seating position that many riders find far kinder to the back than a conventional upright trike. It is the kind of geometry that makes cycling feel accessible again for people who had started to think their riding days were behind them.

The forward pedaling design is also the secret behind the trike's remarkable fit range. Because the pedals live ahead of the seat rather than under it, leg length is accommodated by how the seat and handlebars adjust along the frame rather than by a single fixed relationship between saddle and crank. That flexibility is what lets one frame serve such a broad spread of riders, and it is a big reason the Relaxed Body sits comfortably alongside the most comfort-focused electric trikes in the lineup.

Recumbent Versus Upright: What Actually Changes

It helps to compare the two riding styles directly. On an upright trike, your weight presses down through your seat and, to a lesser extent, your hands on the bars. Your spine is roughly vertical, and your legs pump up and down beneath you. This position is familiar and works well for short trips, but over longer rides it concentrates pressure on a small area of the saddle and keeps the back and shoulders engaged the entire time.

On the Relaxed Body's semi-recumbent layout, your weight distributes across a broader seating area as you lean back slightly, and your legs drive forward rather than straight down. The spine relaxes into a more natural angle. The shoulders drop because you are no longer leaning onto the bars to hold yourself up. And because the pedals are ahead of you, the knees track through a gentler arc that many riders with joint sensitivity find noticeably more comfortable. None of this makes the upright style wrong — it simply serves a different rider and a different kind of ride. For anyone who values comfort over the entire length of an outing, the recumbent approach has a clear edge.

There is also a psychological dimension worth mentioning. Sitting low and leaning back feels secure in a way that perching up high does not. Riders who have felt unsteady on other trikes often describe the recumbent position as calming — there is simply less distance to the ground and less sense of being balanced atop the machine. That reassurance can be the quiet difference between a trike that gathers dust and one that gets ridden every week.

Power on Demand: The 750-Watt Rear-Mounted Motor

At the heart of the Relaxed Body is a 750-watt rear-mounted motor. Placing the motor at the rear keeps the weight low and centered over the two back wheels, which reinforces the trike's stability rather than working against it. For the rider, the practical takeaway is straightforward: this is a motor with enough torque to carry you up hills and hold a comfortable cruising speed without asking your legs to do the heavy lifting.

The motor can be engaged two ways. You can pedal and let the assist add power to your own effort, choosing how much help you want, or you can simply twist the throttle and let the motor do all the work while your legs rest. That second option matters more than it might sound. On a longer ride, being able to switch to throttle-only power lets you catch your breath, ease the strain on tired knees, and take in your surroundings without stopping. It turns the trike into something you can rely on for a full outing rather than a machine that only rewards the fit and the young.

Together, the forward-pedaling comfort and the on-demand motor make the Relaxed Body an unusually forgiving ride. You set your own level of effort, moment to moment, and the trike adapts to it.

There is a broader point here about how electric assistance changes the calculus of riding. For many people, the decision to ride at all comes down to a quiet worry: what happens if I get tired, or if the hill on the way home is more than I bargained for? A capable motor removes that worry. It means you can set out on a longer loop, explore an unfamiliar route, or simply ride farther than you would dare on an unpowered trike, always knowing that a twist of the throttle will carry you home. That confidence is worth as much as the raw power itself, and it is a large part of what makes an electric trike so freeing for riders who had begun to limit where they would go.

Stability by Design: Why This Trike Feels Planted

If there is one quality Dustin returns to again and again, it is stability. Having ridden a great many electric trikes, he places the Relaxed Body at or near the top of the list for how planted it feels — and the reasons are built into its measurements.

The first factor is the elongated frame. A longer wheelbase spreads the trike's contact points farther apart, which resists the tipping sensation that can make some three-wheelers feel nervous through corners. The second factor is how low the whole machine sits to the ground. A low center of gravity is the single most important ingredient in a stable trike, and the Relaxed Body keeps its seat, rider, and mass close to the pavement where they belong.

The third factor is the tire setup, which is where the engineering gets clever. The trike runs a 24-inch by 3-inch tire up front and a pair of 20-inch by 3-inch tires in the rear. That is a deliberate choice: setting the smaller wheels at the back lowers the rear of the frame, dropping the seat and the rider's weight even closer to the ground. The wider three-inch tires add a broad, confident footprint that grips the road. The combination — long frame, low rear, generous rubber — is what gives the Relaxed Body its reassuring, glued-down feel. Riders who prioritize that kind of grip often gravitate toward fat tire electric trikes, and the Relaxed Body delivers much of that same confidence in a lower, more relaxed package.

Getting On and Off: The 16-Inch Step-Over

For many riders, the hardest part of any bike or trike is simply getting on it. The Relaxed Body addresses this head-on with a step-over height of just 16 inches. There is no high top tube to swing a leg over and no balancing act required. You step through the low frame and slide down onto the seat in one easy motion. That kind of accessibility is precisely what riders look for in easy-to-mount, low step-through e-trikes, and it is one of the features that makes this trike so approachable for anyone with limited mobility.

This is also where the low rear geometry pays a second dividend. Because the frame sits low, the seat is close to the ground, and settling into it feels more like sitting down in a chair than climbing aboard a vehicle. For riders who worry about balance, or who have grown cautious about mounting a traditional bike, that difference can be the deciding factor between riding and not riding at all.

Seat Height and the Remarkable Fit Range

The seat is where the Relaxed Body's adjustability really begins. In its lowest position, the top of the seat sits at 30.5 inches. Loosen the seat clamp and slide it upward, and it rises all the way to 38 inches at its highest mark, which is the upper limit the frame is designed for. That is a substantial span of travel, and it is the foundation of the trike's headline claim: a comfortable fit for riders from 4'10" all the way up to 6'5".

Very few single machines can honestly make that claim. It works here because the seat height range is paired with the forward-pedaling geometry and, as we will see, an exceptionally adjustable handlebar setup. A shorter rider lowers the seat, plants both feet flat, and reaches the grips without stretching. A taller rider raises the seat, extends the legs fully into the forward pedal position, and moves the bars out to match a longer torso and longer arms. The same frame, tuned two very different ways, fits both.

That flexibility is exactly why the Relaxed Body appeals so strongly to households where more than one person wants to ride, and to riders who fall outside the average range that most trikes are built around. It is a natural fit for the kind of shopper browsing electric trikes for seniors who needs confidence that the machine will actually suit their body rather than forcing them to adapt to it.

The Forward Pedal Position

On a conventional trike, the pedals sit more or less directly below the seat. On the Relaxed Body, they are moved forward by 12.5 inches. That single measurement is what defines the recumbent riding position and delivers its comfort benefits.

Pushing the pedals ahead of the body lets you extend your legs out in front rather than driving them straight down. The motion is gentler on the knee joint, the seating angle is more relaxed, and the whole posture invites you to sit back rather than lean forward. It is a small number with an outsized effect on how the trike feels over a long ride, and it is the reason the machine earns its recumbent — or semi-recumbent — label.

The Standout Feature: Handlebars That Adjust to You

If the frame and seat set the stage, the handlebars are where the Relaxed Body truly earns its keep. The adjustability here is extensive, and it is the feature most likely to convince a rider that the trike can be dialed in to their exact body.

Start with the range of distance between the grips and the nose of the saddle. In one comfortable middle setting, the grips sit about 19 inches from the front of the seat. Loosen a pair of bolts on the front of the bar assembly and the possibilities open up dramatically. You can bring the grips in as close as 14 inches from the saddle nose — an ideal setting for shorter riders with shorter reach — or extend them out to 26 inches for taller riders with longer arms. Tilt the bars into a lower, laid-back angle and the reach stretches to 27.5 inches for a relaxed, cruiser-style posture.

That is a span of more than a foot of adjustment in reach alone, achieved without any special tools beyond the trike's own hardware. The bars can be rotated, tilted, brought closer to the body, or pushed farther away, which means the same cockpit can suit an upright, hands-close position for a petite rider and a stretched-out, arms-forward position for a tall one. Between the seat travel and the handlebar range, the number of viable fit combinations is genuinely large.

This matters because handlebar reach is one of the most overlooked contributors to comfort. Bars set too far away pull the shoulders forward and strain the lower back; bars set too close cramp the arms and crowd the torso. By making reach so freely adjustable, the Relaxed Body lets each rider find the position where the shoulders relax, the elbows soften, and the hands fall naturally onto the grips. It is the difference between a trike you tolerate and one you actually want to ride.

How to Dial In Your Ideal Fit

With so much adjustment available, it helps to have a simple approach to finding your position. The goal is to arrive at a setup where you can plant your feet at a stop, reach the pedals through their full stroke, and hold the grips with relaxed, slightly bent arms. Here is a straightforward way to get there.

• Start with the seat. Set the seat height so that when you are seated with a foot on the ground, you feel stable and can support the trike comfortably. Shorter riders will want the seat closer to the 30.5-inch low position; taller riders will slide it up toward the 38-inch mark. Remember that the seat cannot go above the marked limit on the post — that line is there for safety.

• Check your leg extension. Because the pedals sit 12.5 inches forward, your legs should extend comfortably ahead of you without locking out at full stroke or feeling cramped at the top. Adjust the seat position until that extension feels natural and easy on the knees.

• Set the handlebar reach. Loosen the front bolts and slide the grips to a distance that lets you hold them with a slight bend in the elbows. Shorter riders may land near the 14-to-15-inch range; taller riders will push out toward 26 inches. There is no single correct number — only the one that lets your shoulders relax.

• Fine-tune the angle. Tilt the bars up for a more upright, hands-close feel or down toward the chopper-style position for a laid-back cruise. Rotate them in or out to match your arm length and preferred posture.

• Lock everything down. Once the position feels right, tighten the seat clamp and handlebar bolts securely so nothing shifts while you ride. A quick check that the seat does not slip under your weight is always worth the extra minute.

The beauty of this process is that it takes only a few minutes and requires no specialized tools. If more than one person will ride the trike, each rider can note their preferred settings and reset them quickly. That kind of shared usability is uncommon on trikes, and it flows directly from how much range the Relaxed Body builds into its frame, seat, and bars.

Footprint and Overall Dimensions

Knowing how much space a trike occupies is essential, both for storage and for transport. The Relaxed Body measures 78.25 inches from the front of the tire to the very back of the frame with the front wheel pointed straight ahead. Turn the front wheel, and that length shortens to 74 inches — a useful figure to keep in mind if you plan to load the trike into a pickup bed or the back of an SUV, where the angle of the wheel can make the difference between fitting and not.

Across the rear, the trike measures 29.5 inches at its widest point, taken from the outside edges of the fenders. That width is worth noting for doorways, garage storage, and bike paths, and it reflects the stable, planted stance that comes from setting the rear wheels comfortably apart.

A few more reference points round out the picture. The top of the front fender sits at 23 inches, and the top of the front wheel, including its fender, reaches 26.2 inches. From the head tube to the crank measures 21.2 inches. The distance from the ground to the bottom bracket is 11 inches, and at their lowest point in the pedal stroke, the pedals sit 5 inches off the ground. These are the kinds of details that rarely make it into a spec sheet but that riders concerned about ground clearance, curb heights, and daily practicality genuinely want to know.

Transporting the Relaxed Body

One of the more thoughtful aspects of the design reveals itself when it is time to move the trike. Because the seat lifts out and the handlebars can be removed, the Relaxed Body can be broken down into a surprisingly low profile for transport. With the bars off, the height from the ground to the top of the stem is just 33 inches — the tallest remaining point on the trike.

Drop that number against the cargo opening of your vehicle and the possibilities become clear. Remove the seat, take out the handlebars, and the low profile that remains can slide into the back of an SUV, a pickup truck, or even a hatchback, depending on how much length the rear of the vehicle offers. Combined with the 74-inch length achievable with the wheel turned, this makes the Relaxed Body far more travel-friendly than its long frame might first suggest. For riders who want to bring their trike to a park, a trail, or a family gathering, that flexibility is a real advantage.

The Rear Cargo Basket: Practical and Well-Built

A trike earns much of its everyday value from its ability to carry things, and the Relaxed Body comes with a genuinely useful rear cargo basket. The top of the basket sits 26 inches from the ground, and the interior measures 16.5 inches by 20.5 inches by 9 inches deep — ample room for groceries, a bag, a jacket, or the odds and ends of a day out. Riders who prioritize hauling capacity will find it stands comfortably among electric tricycles with a large basket.

What sets this basket apart is a detail that is easy to miss until you need it: the basket is lined with a fine metal mesh rather than the widely spaced bars found on many trikes. On those other designs, the gaps between the bars are large enough that small items fall straight through, forcing you to drop a bag inside before you can carry anything loose. The Relaxed Body's mesh solves that problem. You can set small items directly into the basket without worrying about losing them, or you can add one of the custom bags shaped to fit the basket if you prefer. The choice is yours, and either way the cargo stays put.

It is a small piece of engineering, but it captures the design philosophy of the whole trike: anticipate how people will actually use the machine, and remove the little frustrations before they ever arise.

Built for Real, Everyday Riding

It is easy to focus on a trike's headline features and lose sight of how it performs in the ordinary rhythm of daily life. This is where the Relaxed Body's measurements quietly earn their keep. Consider a typical errand run. You step through the low frame and settle onto the seat without strain. You set off using pedal assist to warm up, then ease onto the throttle as you approach a hill, arriving at the top without a racing heart. You load the basket with a few bags at the store, confident that nothing will rattle loose through the mesh on the ride home. When you arrive, you park a stable, planted machine that will not tip as you unload it. Every step of that sequence was made easier by a specific design decision.

The same holds true for leisure riding. On a longer cruise through a park or along a waterfront path, the relaxed posture keeps your back and shoulders comfortable well past the point where an upright trike would start to nag. The wide tires and low stance smooth out the small imperfections in the pavement. And the ability to rest your legs on the throttle whenever you like means the ride ends when you decide it should, not when your stamina runs out. These are the qualities that turn a trike from an occasional novelty into a regular part of life.

That everyday practicality is exactly what draws so many riders to electric trikes in the first place. A trike removes the balance demands of a two-wheeler, the motor removes the fitness barrier, and a thoughtful design like the Relaxed Body removes the fit and comfort compromises that so often stand between a person and the freedom of riding.

Complete Measurement Reference

For readers who want the numbers in one place, the table below collects the key measurements from the Relaxed Body walkthrough. These figures are a helpful starting point whether you are checking fit, planning storage, or sizing up transport.

Who the Relaxed Body Is Built For

Pull all of these measurements together and a clear picture of the ideal rider emerges — or rather, several ideal riders, because the trike's whole reason for being is its breadth of fit.

Shorter and Petite Riders

Riders who have struggled to find a trike that fits without stretching will appreciate the 30.5-inch low seat setting, the 14-inch minimum grip-to-saddle reach, and the low 16-inch step-over. Everything on this trike can be brought in close and low, so a petite rider can plant both feet flat, reach the bars comfortably, and feel in complete control from the first pedal stroke.

Taller Riders

At the other end of the spectrum, a rider up to 6'5" can raise the seat to its full 38-inch height, extend the bars out to 26 or 27.5 inches, and enjoy full leg extension through the forward pedal position. Tall riders are often forced to compromise on trikes built to average dimensions; the Relaxed Body gives them room to stretch out properly.

Seniors and Riders Seeking Comfort

The low center of gravity, the exceptional stability, the easy step-through, and the relaxed recumbent posture all speak directly to older riders and to anyone returning to cycling after time away. Add the throttle option for effort-free cruising and the generous cargo basket for errands, and the Relaxed Body becomes a practical daily companion. It is a natural choice for the shopper comparing electric trikes for seniors who wants stability and comfort without giving up capability.

First-Time and Returning Riders

For someone who feels uncertain about balance, the combination of three wheels, a low seat, a planted stance, and on-demand motor power lowers the barrier to entry considerably. There is far less to worry about and far more to enjoy, which makes this an encouraging trike for anyone easing back into riding.

Riders Managing Joint or Mobility Concerns

The recumbent geometry deserves special mention for riders dealing with knee, hip, or back sensitivity. The forward pedal position reduces the sharp downward pressure that upright pedaling places on the knees, and the reclined seating angle takes strain off the lower back. Paired with the effortless step-through and the option to let the motor do the work, the Relaxed Body offers a genuinely gentle way to stay active. It is the kind of machine that keeps riding possible when other trikes might feel like too much, which is why it resonates with the same riders who seek out easy-to-mount, low step-through e-trikes.

Frequently Asked Questions

What is the difference between a recumbent and a semi-recumbent trike?

The terms describe how far forward the pedals sit and how far back the rider reclines. A full recumbent places the rider in a deeply reclined position with the legs stretched well out in front. A semi-recumbent, like the Relaxed Body, offers a more moderate version — the pedals sit forward of the seat for a relaxed leg extension and lower posture, but the rider is not fully laid back. In practice, the Relaxed Body can reasonably be called either, and the label matters less than the comfort the geometry provides.

What height range does the Relaxed Body fit?

The trike is designed to fit riders from 4'10" to 6'5". That span is achieved through the combination of a seat that adjusts from 30.5 inches to 38 inches and handlebars that adjust in reach from roughly 14 inches to 27.5 inches from the nose of the saddle.

How stable is it compared with other electric trikes?

Very stable. The elongated frame, low center of gravity, lower-set rear end, and wide three-inch tires combine to create an exceptionally planted feel. In the walkthrough, it was rated among the most stable electric trikes tested, thanks specifically to how low it sits and how much rubber contacts the road.

Can I ride it without pedaling?

Yes. The 750-watt rear motor can be powered entirely by the twist throttle, letting you cruise without pedaling whenever you want to rest. You can also pedal with assist for a blend of exercise and help, and switch between the two at any point in your ride.

Will it fit in my vehicle?

In many cases, yes. With the front wheel turned, the overall length drops to 74 inches, and with the seat and handlebars removed, the tallest remaining point is just 33 inches. Broken down this way, the trike can slide into the back of many SUVs, pickup trucks, and even some hatchbacks, depending on the length of the cargo area.

How much can the basket hold?

The rear basket measures 16.5 by 20.5 inches and is 9 inches deep, with a fine mesh lining that keeps small items from falling through. It comfortably handles groceries, bags, and everyday essentials, and custom-shaped bags are available if you prefer. Riders who want maximum hauling room can also compare other electric tricycles with a large basket.

The Bottom Line

The Relaxed Body recumbent e-trike is a study in how thoughtful measurements create real-world comfort. Its elongated frame and low rear deliver stability you can feel. Its 16-inch step-over and low seat make getting on effortless. Its forward-pedaling geometry eases pressure on the knees and hips. And its wide-ranging seat and handlebar adjustments allow a single machine to fit a genuinely enormous span of riders, from 4'10" to 6'5". Layer on the 750-watt motor, the throttle-and-assist flexibility, and the practical mesh-lined basket, and you have a trike engineered around the rider rather than the other way around.

If the numbers in this guide have you picturing yourself in the saddle, the best next step is to see how the fit feels for your body. You can explore the full range of recumbent electric trikes and the wider lineup of electric trikes to compare options, and take advantage of the 30-day test ride to experience the Relaxed Body first-hand before you commit.

A note on measurements: all figures above are drawn from a hands-on walkthrough of the Relaxed Body recumbent e-trike and are provided as a practical reference. sixthreezero backs every trike with a 30-day test ride and a one-year warranty on parts and labor, and maintains an active rider community and companion app for tracking rides.