Online Bike Builder
Build a complete bike from the frame up. Add a frame, groupset, wheels and finishing kit, and the builder flags parts that do not fit and compares live prices as you go. Free to use, with no account needed to start. New here? See the full parts catalogue.
How the online bike builder works
The builder is a parts list you assemble one role at a time. Add a part to any slot and it drops straight into your build, with a running compatibility check and live prices beside every choice. Work top to bottom:
- Start with the frame. It sets the standards everything else has to match, such as the bottom bracket shell, headset and axle spacing.
- Add the drivetrain. Pick a chainset, cassette and derailleurs. The builder flags a speed or standard clash the moment it happens.
- Choose wheels and tyres. Hub, freehub and axle standards are checked against the frame you already picked.
- Finish the cockpit and contact points. Bars, stem, seatpost, saddle and brakes complete the bike.
Nothing is locked in. Swap any part at any time, and the compatibility banner and price total update as you go.
Why build your own bike?
A stock complete bike is a compromise the maker chose for you. Building your own puts three things back in your hands:
- Fit and preference. Pick the finishing kit, gearing range and brakes you actually want, rather than the spec that hit a price point.
- No wasted parts. Skip the upgrade-and-bin cycle where a new bike ships with components you replace in a month.
- Price transparency. Every part shows live prices from real retailers, so you see what the build costs before you commit to any of it.
The trade is time and research, and the compatibility checker is there to take the risk out of the research part.
Compatibility checked as you build
The hardest part of a custom build is knowing whether the parts actually fit together. As you add components, the builder compares their standards and shows an alert when two parts clash, for example a road cassette on a mountain bike freehub, or a chainset that does not match the frame's bottom bracket. A warning explains the conflict and points at the part causing it, so you can swap before you buy rather than after it arrives.
You can also research a single interface first through the compatibility guides, then bring what you learn back into the build.
Frequently asked questions
What is an online bike builder?
An online bike builder is a tool for assembling a complete bike from individual parts on a single page. You pick a frame, groupset, wheels and finishing kit, the tool checks the parts are compatible, and it shows live prices so you can see what the whole build costs before you buy anything.
What parts do I need to build a bike?
A complete bike needs a frame and fork, a wheelset with tyres, a drivetrain (chainset, cassette, chain, derailleurs and shifters), brakes, and finishing kit: handlebar, stem, seatpost and saddle. Some frames also need a matching bottom bracket and headset. The builder lists every role and shows what is still missing as you go, so nothing is forgotten.
Is the bike builder free to use?
Yes. Building a bike, checking compatibility and comparing prices are all free, with no account required to start.
Does the builder check if my parts are compatible?
Yes. As you add parts, the builder compares their standards and shows a warning when two components clash, such as a mismatched freehub, axle standard or bottom bracket. Each alert names the part causing the conflict so you can swap it before buying.
Do I need an account to build a bike?
No. You can build a bike straight away and your draft is kept in your browser. Creating a free account lets you save builds, come back to them on another device and share them.
Can I buy the parts I choose?
The builder does not sell parts itself. Each component links out to the retailers that stock it with their current price, so you buy each part from the shop of your choice.