NovaCain383

iTrader: (8)

I am getting ready to get new wheels. Going to be narrowing the rear 3 inches on each side. I want to run a 17X11 on the rear. How much backspace for the 17X11's with the rear narrowed? Will I have to run offset bushings in the lower control arms?

May also be minitubbing it if it requires it.

Any help will be appreciated. Also post pictures if you are running a narrowed rear with 17's with the specs.

Thanks,

ripinLS1

iTrader: (1)

need too know the same i just order billet specialties street lite 17x11 4 1/2 bs rear and 17x9.5 for the front going to cut rear end 3" off each side tire front 275/40/17 rear315/35/17

NovaCain383

iTrader: (8)

may need to narrow the rear just a little more. Looks like most of the 17X11 with a stock width rear have 7.75 backspace.

I just want to make double sure before i put it under the knife.

ripinLS1

iTrader: (1)

cut the rear end 3 1/4''

NovaCain383

iTrader: (8)

That is my estimate.

sr71

iTrader: (17)

remember the fact that you are not moving the wheel and tire combo's position in the wheelwell. you are just moving the axle flange on the rear inboard 3" and the center of the wheel the same distance. the 7.75" back 17x11 fits like a glove with a 315 mt dr on a stock width rear end. it is a math equation that a 3rd grader could solve. if you take 3" out of each side of the rear, take 3" out of the backspacing on each side. 7.75 - 3 = 4.75".....see, simple. narrowing the rear has absolutely nothing to do with minitubbing. too much tire section width is what requires a minitub. you will NOT need offset control arms with a normal sized 315.

NovaCain383

iTrader: (8)

Thanks for all your help. I was unaware that 3rd graders could add and subtract.

I was not aware that every 17X11 that you can buy has the 7.75 backspace and fits perfectly with a normal 315 tire. Usually read about the BFH mod and having trouble with it rubbing. I wasn't sure that they even offer a BS wheel with 4.75 backspace. Usually they are in .5 sizes. And I never would have guessed that a tire with a wide section width (315) would require a minitub.

You have been the most help by far.

01SOMZ28

iTrader: (37)

sr71

iTrader: (17)

I did nothing at all to fit my 315's mt's and 17x11 tt2's. no bfh, no bumpstop mods, no fenderlip mods.....nothing. and my car is lowered on sportlines.

summit lists a part number for tt2's with a 4.75" back as well as 5" and 4.5" backs.

section widths of 315's vary greatly by brand. a 315 mt doesn't require a minitub to clear at full bottom where one of those massive 315 goodyears might.

oh, and glad I could help.

NovaCain383

iTrader: (8)

Thanks again.

SmokedOutZ28

iTrader: (35)

I would recommend measuring...... I did the "just subtract from the OE #" and ended up with a wheel that didn't sit in the same position as it did with the stock 10 bolt.

Wanna be safe? Measure it! Never know what may happen you order 3'' narrow it may come back 2.75

Here are my current 17x12 TT2's 5'' BS on a 2.25 narrowed rear (Each side)



Look how these tuck - 17x11 5.50 BS on same length rear



Stock Rear with Normal TT2's




BTW I did have to cut and shorten my E-brake cable bracket.

This is how tight it was on the passenger side with no cutting, Driver side had to be cut and trimmed.

01Blk*SS*

iTrader: (4)

OP, what backspacing did you end up going with and how do you like the fit?