Minimalist chain keeper
thingiverse
This tool should work for a variety of frame/chainring combinations. You can adjust the keeper's position around the mount to fit different chainring sizes. Customizable with the following settings: * Chainline: 50 mm is the default setting * SeatTubeDia: 34.9 mm is the default measurement Adjust these two parameters to get an accurate stickout distance from your frame to the chainring. It's recommended that you take manual measurements (see Sheldon Brown).
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