ROTHBIKE FIT
Request a free fitStart free bike fit

All bike fits are free for a limited time.

When your bike feels off,know what to try next.

Roth helps you move from uncertainty to one measured, reversible adjustment—then check it on the rides that matter to you.

Start my free bike fit See how Roth helps
Free for a limited time One clear change at a time Your starting setup stays saved
Concept image of a road cyclist riding indoors on rollers while a phone on a tripod records from the side.
CancelFirst side1 / 3
Almost readyMove the phone a little farther back.Keep the whole rider and both wheels visible.
Guided fit preview

What you need to start

Your bike Trainer or rollers Phone and mount Room for the full view

From uncertainty to a clear next step

One change you understand. One way back.

Start with clear recordings, see why one adjustment comes first, then use real rides to decide whether to keep it, change it, or go back.

Concept image of a cyclist riding on a direct-drive indoor trainer while a phone records the full side view.Visual concept · app overlay shown for demonstration
  1. 01
    Set up

    Know the room is ready.

    Start only when your bike, trainer or rollers, phone, light, and full-bike view are ready.

  2. 02
    Record

    Follow one direction at a time.

    Record the first side, repeat the same setup, then finish with a guided front view.

  3. 03
    Adjust

    Make one clear change.

    See what comes first, why it matters, how much to test, and the exact setup you can return to.

  4. 04
    Ride

    Learn from real rides.

    Check the change indoors, then record what happens on a short, medium, and normal ride.

See the full fit journey

Screens show sample information, not customer results. Private results remain limited to approved supported cases. Public account creation is not enabled in this release. You can still check your setup and request a free bike fit.

Free for a limited time

Your bike fit is free for a limited time.

Get one guided Roth bike fit at no cost during this limited-time launch offer. Your optional feedback helps make every step clearer and more useful.

01 · LIVECheck your setup $0Answer three quick questions about your bike, indoor support, and recording space.02 · LIVELimited-time free bike fit $0Approved riders receive one guided bike fit at no charge during the launch offer.
Available now

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.

Open the free size calculator
R
BIKE SIZINGYour starting range
Example result
GENERAL SIZEM · 54–56 cm
ASTART HEREMediumCompare standover and reach before buying
BBETWEEN SIZESCompare smallChoose by control, clearance, and riding position
Find my size

Illustrative result. The calculator uses your own answers.

ROTH BIKE FIT

Ready to stop guessing at your fit?

Start with three setup questions. If your bike is eligible, request your free bike fit.

Start my free bike fit