I ask this because I'm considering a Middleburn Duo crankset for my bike (ISIS version), and I want a 108 mm spindle length to get the right chainline. SKF and Crank Bros. seem to be universally regarded as the best ISIS BBs you can get. But, the MTB versions don't come in spindle lengths less than 113 mm (the assumption probably being that most MTB drivetrains have triple chain rings, which is true).
Each of these companies sell road bike versions of their ISIS BB with 108 mm spindle length. Can anybody vouch for using these on an MTB for dry conditions XC/endurance riding? Presumably I would be invalidating the warranty, but in practice, do they hold up to XC use?
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