Bike Builder

New: Help Me Choose ranks frames that fit your body and shows its work — plus 70+ real complete bikes and a 6-build compare. 700+ parts, free during early access.

Build your perfect ride.

Bike Builder helps you spec a bike part-by-part — frame, drivetrain, wheels, components — with live weight + price totals and real-time compatibility checks. Catch the mismatches before you place an order, not after.

New: Help Me Choose. Not sure where to start? Tell Bike Builder how you ride and a couple of body measurements, and it ranks frames that fit YOUR geometry — matching stack and reach, then showing you exactly why each frame made the list. The fit estimate comes from your height, so it's a starting point to confirm with a fitter, not a final answer. And nothing is pay-to-rank: Western premium and Chinese direct-to-consumer frames are judged on the same axes.

New: Complete Bikes. Browse 70+ real, manufacturer-spec'd complete bikes — road, gravel, and all-road — and compare them side-by-side against the builds you've spec'd yourself. See "buy it complete" and "build it yourself" pricing together, so you know what you're really trading. Every bike opens straight into an editable build: start from the real spec, then make it yours.

New: Compare 2.0. Put up to six builds head-to-head — with photos, total weight, total price, and full geometry. Bike Builder highlights the best number in each row, spells out the gap to it, and charts weight and cost so the trade-offs are obvious at a glance. Fit numbers (stack, reach, head angle) show side by side with no "winner," because fit is personal.

28 compatibility checks. As you swap parts, Bike Builder runs its checks behind the scenes: freehub standards, brake types, rotor sizes, tire clearance, tire width on wide rims, hookless rim safety, speed counts, chainring BCD, cassette range vs. your derailleur, bottom bracket shells and spindles, axle standards, cable routing, integrated cockpits, proprietary seatposts, and more. You'll see plain-language warnings the moment something won't work — and exactly why. A starting point. Your local mechanic still has the last word.

Built openly. Growing weekly. Bike Builder launched in May 2026 and the catalog grows every week — 700+ parts across 100+ brands and 16 categories, with Western premium and Chinese direct-to-consumer carbon on the same screen, no hidden hierarchy. The catalog updates over the air, so new brands land without waiting for an app update. Made by a builder who got sick of his own spreadsheet. Don't see a brand you want? Email bikebuilder.hq@gmail.com or tag @bikebuilderhq and we'll add it.

Real prices. Real shopping list. See real prices from real retailers as you build. When you're done, Bike Builder generates a shopping checklist with direct links to where each part is in stock — so you can compare totals before you click "buy."

Built for builders. Whether it's your first build or your fifth, Bike Builder is the spreadsheet you don't have to maintain. Plan it. Compare up to six builds side by side. Share your build card to Reddit, Instagram, or WhatsApp. Then ride it.