Tuesday, 21 January 2020

Bike chain gap gauge

For the setup of the 12 speed gears on Shelley's and Dean's bikes, it was necessary to adjust the chain 'B' gap closer than that recommended by SRAM.


I ended up drawing an additional curved line on the SRAM guide.  During a spare few minutes, in the evening, I created my own variation and 3D printed it.



My version has steps for 5mm, 10mm and the SRAM suggested 15mm. All of our bikes worked best closer to 10mm.


The tool fits the SRAM 50mm chain guide cog and it works the same way as the SRAM guide. With the chain in the lowest gear, on the largest sprocket, the tool is held by hand round the upper cog of the derailleur and aligned with the tip of the nearest tooth of the largest gear. The B-tension screw is rotated to change the gap to the desired distance.


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Download 3D models:
Chain gap gauge, Fusion 360, STEP and STL (Zip)
Licence attribution - small business exception

My designs in the Fusion 360 Gallery.
My models in the GrabCAD library.
My designs on YouMagine.com

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