Need help with wheel spacer sizing

[clifperry]

I got the GT500 brake kit. I started the install only to find out that my 20" 1995 Cobra R replica wheels hit the front of the caliper (go figure!). Anyway, I measured the gap between the wheel and the rotor as the wheel is touching the caliper and it is 8mm. So, how much clearance to I need? Will a 15mm spacer (7mm of clearance) be sufficient? Or should I go up to 20mm (12mm of clearance)?

Your expertise and guidance is appreciated.

 

[GT in Detroit]

I wouldn’t think you even need that much, I put on 18*10 billits in the rear and my caliper is maybe 2 or 3mm from the rim, caliper should be stationary so any clearance is enough..


Tks
Jim