I used to have one and then sold it to get a normal spaced one. Worst mistake ever, especially with me being left footed. With the mod stocks u can smash down on chain stays and it takes it. Where as on my rex (135 spacing) it either broke my mech or when i took it off, it always made the chain tension loose. Im going to get another mod stock. Soon. Just run zoo hubs or any deng hubs or profiles with them though. Alot of strain goes into the back hub etc... So you want a beut of a back hub in.( The back cassettes arnt weak. I ran a zoo! hub and my mate runs a profile and nothings happened too them so far. Been and was amazing) Abdab...