Using the XD-Driver standard, SRAM’s 10-42t cassettes have found immense popularity in mountain biking. Both the XX1 and X01 cassettes feature ten steel cogs, with the largest 42t made of a lighter (but faster-wearing) aluminium. Given the 11-speed cassettes are one of the more expensive transmission items, aftermarket big cog options have arisen to extend the life of these parts.
To our knowledge, Italian component manufacturer Ari were the first to offer such a replacement, and they now have 39, 42 and 44t options for those grinding away their granny cogs.
Fitting one of these cogs requires you prying the stock 42t cog off your XX1 or X01 cassette with a flat blade screwdriver. It’s the same procedure as using similar aftermarket cogs from the likes of OneUp or Wolf Tooth. Cheaper X1 or GX cassettes are pinned together, and so cannot be used with any of these upgrade cogs.
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SRAM introduced its Rival 1 and Force 1 groupsets earlier in the year, and many 2016 cyclocross bikes are showing the group’s popularity. However, cassette choice remains limited, with either a 11-36t or 10-42t to choose from.
While many seek a wider range than 11-36t, the 10-42t is perhaps a little too wide for many racing cyclocross or gravel riding, especially given the jump from 36t to 42t between the first and second gear. With this, Ari recently released a 39t aftermarket cog.
You can read more at BikeRadar.com
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