It seems so small and insignificant, yet it's so important. The BB30 Wave Spring Washer is the keystone in your bottom bracket assembly, providing compression for proper setup and bearing preload, while helping to maintain adjustment after it's dialed in just right. They're also quite easy to lose or damage, so grab a few while you're at it.
This is a MegaExo Left Crank Bolt for 19mm MegaExo Cranks. - M12 bolt
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