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Bash rings
and carbon fiber
See compatibility above
Fits 110 BCD asymmetric 4-bolt cranks
From the highest peaks to the
40T GC Cog for Shimano Black:(1) Black Bash rings40T GC Cog for Shimano The GC line of cassette extender cogs allow you to modify your 10 speed cassette into a wide range cassette. To achieve the optimal shifting, the GCs are optimized for Shimano or SRAM cassette. Compatibility: Compatible with Shimano 10 speed cassettes listed on the GC tech page Compatible with all 10 speed rear derailleurs and chains Note that you may need a longer chain that you currently have your bike Chain stretch should be
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