The digital garage for cyclists.
Manage your bikes, organize your parts, plan complete builds, and know what fits before you buy.
Report · #00421
CompatibleINPUT A
Shimano 105 R7100 Rear Derailleur
12-speed · Max cog 36T · GS cage
INPUT B
Shimano CS-R7100 Cassette 11–34T
12-speed · HG-L2 freehub
Toolkit
Everything you need to run your workshop
Garage
Add the bikes you own. Record builds, service history, and keep everything organized in one place.
OpenParts bin
Track every part you own, where it lives, and what it is compatible with before your next upgrade.
OpenBuild planner
Spec a bike part-by-part with live compatibility across the whole build.
OpenCompatibility
Quick A + B verdict with reasoning and standards so you know what fits before you buy.
OpenCapabilities
Manage bicycles, parts, builds, and upgrades
Track the bikes you own
Keep a complete record of every bike, build, and spec in your stable.
Track the parts you own
Catalog every component with brand, model, and part number.
Build bikes digitally
Spec builds part-by-part and see the whole picture before you buy.
Plan upgrades
Compare options, check fit, and know what changes before you wrench.
Verify compatibility
Automatic standards-based checks keep mismatched parts out of your cart.
Save service history
Log work done, keep notes, and build a long-term record for every bike.