42T GC Cog for Shimano Black:(1) Black Wolf Tooth Precision Headsets are

Wolf Tooth Precision Headsets are machined in the USA out of aircraft grade aluminum with superior sealing for protection against the elements

It can be attached under a saddle

Additional stress-relief gussets for Comfort

Light Action lever: The ReMote LA lever sits close to the bar

42T GC Cog for Shimano Black:(1) Black Wolf Tooth Precision Headsets are42T GC Cog for Shimano The GC42 cassette cog is so big that when machining the first batch, the machinist thought he made a mistake! 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 chains Note