TIL #3: Drivetrain ‘Trim’

Bikes are simple.  They have two wheels and a chain, a derailleur that moves said chain from gear to gear, allowing you, the rider, an easy (or easier) time when riding your favorite routes.  As technology continues to evolve in the industry, improvements such as expansion of the drivetrain has occurred.  With this in mind, chainline, or the angle in which the chain is at from a cog on the cassette to a chainring on the crankset, has begun to experience some changes.  While some gear combinations are not the best for the bike, namely, the large chainring and largest cog on the back, or the dreaded small and small combo, the rider may need to put the bike into these combinations during times of peril.  In addition to a speedier means of wearing out the drivetrain, these combinations and others showing a similar chain angle, tend to make some noise…the solution, mostly found on ‘road bikes’ is the ability to ‘trim’ the front derailleur, these half-shifts allow the front derailleur to be best placed in relation to where the chain is lined up on the cassette. Continue reading “TIL #3: Drivetrain ‘Trim’”