The bicycle drivetrain and crankset compatibility guide
Almost every drivetrain question comes down to four things: the bottom bracket shell your frame has, the spindle your crank runs, where the chainring sits across the frame, and how many speeds the rest of the drivetrain is built for. Get those straight and the rest — chainring size, crank length, 1x or 2x — is a choice rather than a gamble.
Each guide below is a complete job or a complete standard, written to be read on its own. Where a part is named, it comes from our catalog; where a figure is quoted, it comes from the manufacturer’s own documentation or from the study it is drawn from, linked so you can check it.
Guides
- How to fix BB30 and press-fit bottom bracket creak without replacing bearingsPress-fit and BB30 creaking is micro-movement in the frame shell, not worn bearings. Degrease, bond the outer race with retaining compound, reassemble to spec.
- Solving SRAM 1x chainline offset and inner chainstay rubChainring-to-chainstay rub on a SRAM Rival 1x is a chainline problem, not a clearance one. Measure the chainline, fit the right spacers, and it goes away.
- Gravel crank length: what actually changes when you go shorterShorter cranks do not cost you power. They change joint range, ground clearance and your power meter reading — and your saddle height has to move with them.
- 2x to 1x conversion: chainline, spacers and narrow-wide setupConverting a 2x crank to 1x leaves the chainring outboard of where it should sit. Find your target chainline, correct the bias, and set up chain retention.
- Threaded vs press-fit bottom brackets: BSA, T47, PF30 and DUB explainedEvery common bottom bracket standard: shell dimensions, thread spec, the spindle each takes, and why press-fit shells creak when threaded ones do not.
- Chainring wear and chain suck: how to spot it before it costs you a drivetrainA worn chain is what wears your chainring. Replace the chain at 0.5% and the rings last for years; miss it and you buy ring, cassette and chain together.
- Crank-based vs spindle power meters: frame clearance and compatibilityWhether a left-arm power meter fits comes down to the gap between crank arm and chainstay. How to measure it, and which spindle standards rule the swap out.
- Can you run an 11-speed crankset on a 12-speed drivetrain?Often yes, but it depends which 12-speed chain. Shimano road moves the chainline 1 mm, Hyperglide+ needs matching rings, and SRAM rules out Eagle on 11-speed.
- How to repair stripped pedal threads: tap, bushing, or replaceDamaged pedal threads can be chased with a tap; stripped ones need an oversize bushing kit. Carbon and hollow arms cannot be repaired this way — how to tell.
Straight answers
35 questions answered one page at a time — will this cassette fit, does that derailleur handle a 51-tooth cog, can I put a tapered fork in this frame.
Browse all 35 answers