![]() ![]() Shimano’s 12 speed drivetrain was designed to use a much longer chain than older drivetrains. ![]() I just made that mistake, and I had to buy a new chain to remedy the situation. just consider that for the past million years, every bike mechanic was trained to use one of two methods for sizing a chain, neither of which are correct for these new 12 speed Shimano drivetrains. Even if you had a bike shop install it you might want to double check. In fact, if you're having shifting problems on your new XTR M9100, XT M8100 or SLX M7100 drivetrain, incorrect chain length cold be the issue. It will definitely give you the incorrect chain length on the new Shimano 12 speed systems. Many people are familiar with the old "reference pin plus two" method for calculating chain length. ![]()
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