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The wide Q is because they traditionally have to package 3 chainrings and a fat tyre into a small space, and something has to give. The 175 tradition dates from the 90s delusion that there was some advantage from long cranks which could not equally have been achieved (and on an MTB with corollary benefits in terms of ground clearance) by using lower gears and shorter cranks.
gbj_tester
@Jonny69
Is there a good reason why mtb cranks are almost always 175 and mega wide Q?