Hi everyone, I'm building up a DJ bike from an old city bike wich no one is using anymore. The hub (On the rear) has no mounts to fix a brake rotor. And my rims are not suited for rim brakes. I would like to buy a hub where it's possible to mount a brake rotor and where i can keep my current spokes. Does anyone know if theres is a way or a website where you can calculate wich hub is needed ? btw, my spokes are a little too long right now so if the hub is a little smaller there would be no problem. Cheers & ride on !