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There's nothing about 12-speed SRAM mountain groups that would preclude them from working on a typical 8-speed era MTB frame. Because your bike is non-Boost, you need to make sure to get the non-boost version or configuration of whatever crank you're getting. One potential stumbling block depending on the bike is that the 49mm chainline of most non-Boost ...


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Your frame most likely has rear hub width of 135 mm for 10 mm QR-axles. 12-speed groupsets are likely to only be compatible with through-axle hubs of widths 148 mm (boost), and 142 mm (non-boost) and diameter 12 mm. However, some of 142 mm hubs can be converted to accept 135 mm QR-axles by means of end caps swap. And cheaper 12-speed groupsets such as Sram ...


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