Minimum Seat Height vs Rider Height on an E-Bike

Minimum seat height and rider height solve two different problems, and confusing them is what causes most online sizing mistakes. The seat's lowest setting has to let a rider reach the ground when stopped, but it also has to leave room to raise the saddle high enough for correct pedaling extension — and those two positions are not the same height. A bike that lets your feet touch flat at a stop can leave your knees bent too sharply while pedaling, and a bike set correctly for pedaling can require a toe-down or one-foot-down stop instead of both feet flat. Before buying online, separate these two questions and test both, rather than judging fit from a single height number.

How Minimum Seat Height Is Actually Measured

Minimum seat height refers to the lowest position the saddle can occupy on its post, typically measured from the ground to the top of the saddle when the seatpost is dropped to its lowest marked or safe insertion point. TST's current model comparison page does not publish a separate minimum-saddle-height figure for each model; it lists a recommended rider height range instead — for example, 5'2" to 6'4" for the Mega-torque and Dual-Battery variants, and 4'11" to 6'4" for the Folding and Folding Pro models. Because the published range is a rider-height recommendation rather than a direct seat-height measurement, treat it as a starting filter and confirm the actual minimum and maximum saddle-post extension from the product's specification tab or manual before you buy, especially if you are near either end of the listed range.

Independent bike-fit references define the pedaling-specific number you actually need: saddle height, measured from the center of the bottom bracket (or crank axle) straight up the seat tube to the top of the saddle, using an inseam-based formula such as inseam times 0.883 as a starting point, then fine-tuned to a knee bend of about 25 to 35 degrees at the bottom of the pedal stroke. This is a different measurement, using a different reference point, than "distance from the ground with the seat all the way down," and the two numbers should not be treated as interchangeable when you're deciding whether a bike will work for you.

Do Both Feet Need to Touch the Ground?

Not while pedaling, and not as a universal rule for every rider — but manufacturer guidance is specific about what should happen when the bike is stopped. Motorcycle- and e-bike-style owner's manuals commonly instruct riders to apply the brakes and keep both feet on the ground when stopped, warning that resting a foot on the pedal at a stop can unintentionally engage pedal-assist and cause a loss of control. That instruction is about the stopped state, not the pedaling state, and it should not be read as a requirement that the saddle sit low enough for flat feet while seated and pedaling.

While pedaling, a saddle set low enough to plant both feet flat on the ground typically leaves too much knee bend through the stroke, which reduces pedaling efficiency and can increase strain over a full ride. Bike-fit references consistently target a slight knee bend, not a flat-footed seated position, as the correct pedaling setup — the seat is expected to sit at a height where your feet reach the ground only by tilting the bike slightly or standing on your toes when you stop, not while you're seated and pedaling normally. This is a documented and normal part of correct bike fit, not a compromise, and it will feel unfamiliar if your only frame of reference is a bicycle-style seat you're used to sizing for flat-footed comfort. This article does not address whether a flat-footed stop is necessary for a rider's individual balance, mobility, or medical needs — that judgment depends on factors specific to each rider and is outside the scope of a general fit explanation.

Balancing Stop Confidence With Correct Pedaling Fit

The practical fix is to test the bike in two separate states rather than judging it from one seated position. Set the saddle first for pedaling: sit on the bike, place your heel on the pedal at its lowest point with the crank in line with the seat tube, and raise the seat until your leg is almost straight; when you shift to the ball of your foot for normal pedaling, this should leave the correct slight knee bend. Once that height is set, separately test your stop technique: bring the bike to a full stop, apply both brakes, and check that you can confidently plant at least one foot solidly on the ground — either by leaning the bike slightly to one side at the hips, sliding forward off the saddle onto the top tube, or stepping down with the dominant leg — without feeling unstable or needing to catch your balance.

If a bike's minimum saddle height still leaves you unable to reach the ground confidently in that stopped, leaned position — not just when seated fully upright and pedaling — that is a genuine geometry mismatch, not something to solve by permanently riding with the saddle too low. Lowering the seat below the pedaling-correct height to guarantee flat feet at every stop changes both your pedaling mechanics and, on a bike with a cadence sensor or torque-based pedal assist, potentially how predictably the motor responds to your pedal stroke. A frame with a lower standover and a shorter minimum seat-tube length, such as a step-through model, is often the more direct fix for a rider who cannot comfortably combine correct pedaling height with a confident stop, rather than accepting a compromise setting on a mismatched frame.

Running the Two-State Test After Delivery

Once the bike arrives and is fully assembled per the manual, work through both states in a flat, low-traffic area such as a driveway before committing to regular riding:

1. Set the saddle to the pedaling-correct height using the heel-on-pedal method, then pedal a short distance and confirm your knee holds a slight bend, not a lock, at the bottom of each stroke.

2. Come to a complete stop, apply both brakes, and check that you can plant a foot solidly on the ground by leaning the bike slightly or sliding forward off the saddle, without last-second wobbling or needing to grab something for balance.

3. Repeat the stop check at a slightly different lean angle and on a very slight incline if one is available, since a flat driveway does not fully represent every real stopping situation.

4. If either state fails — the knee bend is wrong even after adjusting saddle height within its published range, or the stop still feels unstable at the lowest saddle setting — treat that as a fit mismatch for this frame, not a technique problem to push through.

TST's published return and refund terms allow a full refund within 14 days of delivery on an unused bike, with a 20% restocking fee applying between 15 and 30 days, and no returns accepted once a bike has been ridden past 30 days from delivery. Run this two-state test inside that window, and if the mismatch is a frame-geometry issue rather than an adjustment issue, compare a step-through or lower-standover model against the same rider-height range on the current comparison and specification page before deciding whether to exchange or return.