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Have you converted your bike to 1X in the past 5 years? If so, your chainline could be causing premature drivetrain wear.
Find out how to optimize your setup and save money.
What is chainline?
Chainline is the distance between the centerline of your frame and the average centerline of your chainring(s). For 1X this is easy – If the center of your chainring teeth is 49mm from the centerline of your frame then your chainline is 49mm. It gets slightly more difficult if you have multiple front chainrings. A 2X crank with tooth centerlines that are located at 45mm (smaller ring) and 53mm (larger ring) would have a 49mm 2X chainline. Unfortunately, if you were to remove these rings and install a standard narrow-wide ring the resulting 1X chainline would be about 52mm. This is 3mm wider than the ideal 49mm 1X chainline but makes up the vast majority of all 1X conversions. At OneUp Components we're 100% focused on 1X drivetrains. Below is a detailed guide to help you get perfect chainline.
Bicycle chainline is one of the most overlooked aspects of drivetrain setup for 1X systems. This is understandable since before 2009 mountain cranksets were a pretty standardized piece of equipment. As such we haven't been conditioned to think about it - That has all changed.
Symptoms of poor 1X chainline
So what is Boost 148
Boost 148 was created to give frame makers more design freedom for tire and front derailleur clearance. From a drivetrain perspective it moves the cassette 3mm away from the frame centerline. The new ideal chainline for Boost bikes is 51-53mm.
What do I need to do to setup my Chainline Correctly?
OneUp is the only chainring manufacturer to provide shims with our rings to tune your chainline based on your components.
Follow the chart below to get the best possible performance out of your 1X setup.