Meet Bikebook Wrench Log — Offline bike + chain wear log

Health And Fitness

Bikebook Wrench Log

Offline bike + chain wear log

What Bikebook Wrench Log does

Bikebook is the offline maintenance logbook for cyclists who actually wrench their own bikes. Build a garage of every bike you own, then track each component — chain, cassette, chainrings, brake pads, tires, cables, bottom bracket, sealant — by its own mileage and install date. The killer feature: a chain-wear calculator that turns your measured 0.5/0.75/1.0% stretch into a clear “replace now / X miles left” verdict, so a $30 chain never grinds away your $400 cassette. Log a ride or a quick odometer bump in one tap and Bikebook rolls the miles onto every fitted part. Set service intervals (lube every 150mi, bleed brakes every 1500mi, full service every 2000mi) and get on-device reminders before things wear out. When you swap a part you can retire it, see its full lifespan, and move a component to another bike without losing its history — something even Strava can’t do. Every receipt, torque spec, and service note lives in a parts log you own. No account, no Strava connection, no subscription, no cloud — 100% on your iPhone, even mid-ride with no signal. Buy once, wrench forever. Download Bikebook and stop guessing when to replace your chain.

A look inside

Tap any screenshot to open the full-resolution version.

What's inside

• Multi-bike garage — Add every bike with a name, type, photo, and current odometer; switch between bikes and see each one's component health at a glance.
• Per-component mileage tracking — Attach components (chain, cassette, chainrings, pads, tires, cables, BB, sealant) each with install date and own accumulated miles, updated whenever you log a ride on that bike.
• Chain-wear calculator — Enter your chain-checker reading (0.25/0.5/0.75/1.0%) and drivetrain speed; get a clear replace-now / good / monitor verdict plus projected miles remaining based on your wear rate.
• One-tap ride / mileage logging — Log a ride or bump the odometer in one tap; miles roll onto every fitted component automatically, no GPS or network needed.
• Service-interval reminders — Set intervals by miles or time (lube chain, bleed brakes, full service, tubeless top-up) and get on-device local notifications before a part is due.
• Component transfer & retire — Move a component to another bike keeping its mileage history, or retire a worn part to the archive and see its full lifespan and cost-per-mile.

Why we built it

Cyclists have no good offline way to track per-component mileage and chain wear across multiple bikes; Strava tracks rides but not component wear thresholds, and every dedicated tracker (ProBikeGarage, Componentry, Geer, mainTrack) is a subscription that leans on ride-sync.

What makes it different

A buy-once, fully-offline garage that turns a measured chain-stretch reading (0.5/0.75/1.0%) into a replace-now verdict and tracks every component's own mileage — including moving a part to another bike with its history intact — with no account, no Strava, and no subscription, the exact features the top trackers paywa…

Who it's for

Anyone who wants honest tracking without a coach, a subscription, or a streak guilting them at 11pm.

In one line: Offline bike + chain wear log

Try it

See the Bikebook Wrench Log app page for the full feature list, the info table, and support links.

Use Bikebook Wrench Log, found a bug, or have a feature request? Comments are open below — anonymous is fine.