what is the minimum clearance required between the caliper in the inside of the wheel? I have a set of 3 piece modular wheels in 16" dia, and bolted one up to my SorT 13" disc brakes. There is some very minor interference between the outside brake pad locating tab and the inside of the rim that I could take care of with a little grinder work. The wheels are Eplison 3 piece modulars, cast mesh centers and a forged rim. They have black centers and a polished rim. Sort of a BBS knock off.