The difference between 170, 172,5, and 175, for the averge hieghted person is pretty small in reality. As a shortarse my ideal crank length is 161mm I think. So I ride 165mm on everything. Definitely feel like I'm over extending on 175s. Which I use on the SS 29er for leverage. But the fact that I dont mind them despite them being in theory 14mm too long. Shows the insignificance of the 2,5mm difference between the standard sizes.
The difference between 170, 172,5, and 175, for the averge hieghted person is pretty small in reality. As a shortarse my ideal crank length is 161mm I think. So I ride 165mm on everything. Definitely feel like I'm over extending on 175s. Which I use on the SS 29er for leverage. But the fact that I dont mind them despite them being in theory 14mm too long. Shows the insignificance of the 2,5mm difference between the standard sizes.