Re:
i have two bikes with Spin.. one with the regular rim brake and i'm very paranoid of braking hard like you mentioned before.. but on the other hand was able to purchase an almost new unused wheel set and the front had the disc hub version.. still waiting to get some long screws from ebay since the traditional M5-10mm didn't worked for those old hub version.. i needed at least a 18mm long screw.. i'll post photos when i'll finish.