I have a pair of BFG drag radials 315//40/17 on 17x10.5 rims. The tires just barely clear my exhaust pipes. So when taking particular turns or driving over bumps I will get a slight rub. I am unfamiliar with wheel spacers but was wondering if these could help me out. I probably would only need about a 1/4 in. spacer. What are different types of spacers and what are some common concerns I should be aware of when using these. Thanks a lot.