If your child already rides a 20-inch bicycle, it’s reasonable to start with the same wheel size when shopping for an e-bike. But two bikes with 20-inch wheels can put the seat, handlebars, and brake levers in different places. Those differences matter when your child needs to get on, turn in a tight space, or put a foot down at a stop.
The Rundeer Prince has 20-inch wheels and a published rider height range of 4′3″ to 5′7″. Use that range to narrow your search. Then compare the Prince with a bike your child already handles comfortably.
Take two measurements at home
Standing height. With shoes off, have your child stand against a wall and look straight ahead. Measure from the floor to the top of their head. If they fall near either end of the Prince height range, their leg length and reach deserve a closer look.
Cycling inseam. With your child still standing in socks or bare feet, place a hardcover book between their legs, spine facing up. Raise it gently until it rests where a bicycle saddle would. Keep the book level and measure from the floor to the top of its spine. Repeat once to check the measurement.
The inseam is especially helpful for a step-over bike like the Prince. Ask for the frame’s standover height and where it was measured. That tells you how high the frame sits where the rider stands over it. Seat height is a separate measurement and answers a different question.
Use their current bike as a reference
Suppose two children are both 4′8″. One can comfortably straddle their current bike but has to stretch to reach the grips. The other reaches the bars easily but struggles to step over the frame. Their standing height is identical, yet the dimensions you need to investigate are different.
With your child’s current bike upright on level ground, note three things:
| On the current bike | What to compare on the Prince |
|---|---|
| Where your child stands when getting on and off | Frame height at the corresponding standover point |
| How far they reach from their normal seated position | Distance from the seat to the grips, measured the same way on both bikes |
| Whether they can operate each brake lever while holding the grip | Lever reach and available adjustments on the exact version you’re considering |
When ordering online, send Rundeer your child’s height, inseam, and the concern you want to resolve. “Their bike fits at the seat, but the brake levers are hard to reach” gives the support team a more specific question than height alone.
What to check during an in-person fit
Start with the power off. Can your child mount and dismount without catching a leg on the frame? While seated and supported, can they turn the bars in both directions with relaxed shoulders and operate the brakes without shifting their hands off the grips?
Next, have them walk the bike a few steps, turn it, and bring it to a stop. Pay attention to how they manage its weight when it leans slightly. A rider who feels comfortable once seated may still find the bike difficult to maneuver through a gate or around a parked car.
If your child is between sizes
Choose for the rider they are today. If your child needs to stretch for the brakes or relies on an adult to hold the bike at every stop, give them more time or consider a different fit. If mounting, control reach, and handling all look comfortable, you have a clearer basis for deciding whether the Prince belongs on your shortlist.
Before buying, also check rider eligibility and the rules for the places your family plans to ride. View the Rundeer Prince sizing and product details.
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