Bike Builder
Build your perfect ride.
Free · Designed for iPad. Not verified for macOS.
New brands added weekly. Build your bike from 700+ real parts with 27 compatibility checks and real shopping prices — 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.
27 compatibility checks.
As you swap parts, Bike Builder runs 27 checks behind the scenes: freehub standards, brake types, rotor sizes, tire clearance, tire width on wide rims, hookless rim safety, speed counts, chainring BCD, 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 your builds side-by-side. Share your build card to Reddit, Instagram, or WhatsApp. Then ride it.
Fixes & sturdier plumbing.
• Compare Builds: the "+" button on the empty compare screen now opens the build picker (it was unresponsive — sorry!). There's also a big friendly Add a Build button right on the screen now.
• Chainring picker: rings are no longer incorrectly blocked on cranks whose BCD spec carries extra text (e.g. "110mm (4-bolt)" now matches "110mm" rings).
• New check: you'll see a heads-up when a standalone chainring's speed rating doesn't match your drivetrain.
• New check: tires measure wider than their label on wide rims — you'll get a heads-up when your combo is likely to run close to the frame's clearance limit.
• Added support for Cannondale's PF30-83 Ai bottom bracket shell (SuperSix EVO CX/SE).
• Under the hood: weekly catalog updates are much more resilient — a single unusual field in new catalog data can no longer hold up the whole refresh.
The catalog keeps growing — now 700+ parts across 100+ brands, updated weekly without app updates. Don't see a brand you want? Email bikebuilder.hq@gmail.com.
The developer, Regan Charles Lofgreen, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Regan Charles Lofgreen
- Size
- 23.2 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 26.4 or later.
- iPhone
Requires iOS 26.4 or later. - iPad
Requires iPadOS 26.4 or later. - Mac
Requires macOS 26.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.4 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Regan Charles Lofgreen