What works today
Know which Roth path works for your bike now.
Use brand-neutral sizing across common bike styles today. Free video fits currently support adult road, gravel, and indoor setups; later tools stay clearly separated below.
Fit-first bike sizing
Start with a size that matches your body.
Get a brand-neutral starting range before comparing road, gravel, commuter, mountain, fat-tire, or electric bikes.
01Choose your bike styleElectric assist is included without changing body sizing.
02Measure height and inseamSimple body measurements—not technical bike numbers.
03Get your starting rangeGeneral size, common frame range, and what to compare next.
Illustrative result. The calculator uses your own answers.
Everyday riders
Size an e-bike now. Video-fit support comes later.
The free size calculator already supports electric bikes. The current video-fit program accepts eligible adult road, gravel, and supported indoor-bike setups; e-bike video fitting is not available yet.
Generated visual concept · unbranded e-bikeStart with the bike you actually own.
Upright bars, a step-through frame, and everyday riding clothes should feel normal—not like an exception.
Generated visual concept · unbranded fat-tire e-bikeEveryday riders deserve a useful fit.
Future e-bike video guidance should work for comfort, errands, confidence, and fun—not only athletes on race bikes.
Generated visual concept · unbranded e-bikeClear guidance should not require a race setup.
Future e-bike video support should keep the room, phone, and next-step instructions simple and readable.
Bike weight, motor location, axle hardware, tire width, trainer rating, adjustable parts, and manufacturer instructions must all be checked before Roth can offer an electric-bike fit.
Ready to stop guessing at your fit?
Start with three setup questions, then continue with your free bike fit.