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Proportional Response™
Armrest Stack: The minimum is 58
eliminating the absolute need for a heavy chain guide
or environmental responsibility
ethirteen Helix Plus Cassette 12s Steel Cogs 9-36T Code:FWS20-117 Proportional Response™e*thirteen Helix 12 Speed Steel Cogs 9 36T for 9 50T Cassette Black Helix Plus cassettes have replaceable gear clusters. That means ongoing service and replacement costs will be less than half that of SRAM cassettes. As an added bonus, Helix 12s clusters are backward compatible with and can be used to upgrade your existing TRS+ 9 50 cassette. When installing the Helix Plus cassette, as with any cassette, we recommend checking chain wear. If your chain
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