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I can only think that the 4" bs that hit the calipers was because of non stock calipers. I do know that aftermarket calipers can pose a problem with 4" bs.
Keep in mind you can order 3.75", 3.5" back spacing as well. Spacers are just not a good idea.
I canceled my order because now I need to do some more research.
4" back spacing should be perfect with a stock set up, but I am a little nervous since they are custom order.
The spokes on classic ss are flat in the back. Not sure why 4" will not work. I am hoping to find an old beat up unilug with 4-1/4 back spacing to test. If 4-1/4" works then 4" will for sure. If 4-1/4" does not work I will test with spacers until it works and that is the bs I need.
I can only think that the 4" bs that hit the calipers was because of non stock calipers. I do know that aftermarket calipers can pose a problem with 4" bs.
Keep in mind you can order 3.75", 3.5" back spacing as well. Spacers are just not a good idea.
I canceled my order because now I need to do some more research.
4" back spacing should be perfect with a stock set up, but I am a little nervous since they are custom order.
The spokes on classic ss are flat in the back. Not sure why 4" will not work. I am hoping to find an old beat up unilug with 4-1/4 back spacing to test. If 4-1/4" works then 4" will for sure. If 4-1/4" does not work I will test with spacers until it works and that is the bs I need.
Bill
Backspacing really has nothing to do with whether the wheel will hit the caliper or not. It is how the backside of the spokes are designed that matters. If the spokes come straight out from the hub surface, they will most likely hit the caliper. That is where you will need the spacer to push the wheel out. If the back side of the spokes arch out towards the front side, they will most likely clear. There are people on this forum that are running a 5.5" back space wheel (on the rear) with no problems of hitting the caliper. The drag racers who are running skinnies on the front most likely have a 2-2.5" back space and have no problems. Stock 15X8" aluminum wheels were 4" back space and didn't have problems.
Back spacing is the distance from the mounting surface to the back edge of the rim. The backspacing will effect how much clearance there is between the rim/tire and the frame, steering parts, trailing arm, and suspension parts.
A spacer shouldn't effect your alignment unless the two surfaces of the spacer are not parallel.
Backspacing really has nothing to do with whether the wheel will hit the caliper or not. It is how the backside of the spokes are designed that matters. If the spokes come straight out from the hub surface, they will most likely hit the caliper. That is where you will need the spacer to push the wheel out. If the back side of the spokes arch out towards the front side, they will most likely clear. There are people on this forum that are running a 5.5" back space wheel (on the rear) with no problems of hitting the caliper. The drag racers who are running skinnies on the front most likely have a 2-2.5" back space and have no problems. Stock 15X8" aluminum wheels were 4" back space and didn't have problems.
Back spacing is the distance from the mounting surface to the back edge of the rim. The backspacing will effect how much clearance there is between the rim/tire and the frame, steering parts, trailing arm, and suspension parts.
A spacer shouldn't effect your alignment unless the two surfaces of the spacer are not parallel.