Rear Wheel Offset?

[BABY BOEING]

I'm about to order my rear wheels and have a couple of questions. On a 15*8 wheel is 4in. of backspacing ideal for clearence on the fender lip and frame? Also can a 15*9 fit and if soo with what backspacing? Thanks in advance for any help. Jon

 

[BABY BOEING]

Any advise guys.

 

[Roger]

I'd go with 4.25" backspace. Original TR wheels are 3.75" with 7" rim. Divide the difference between 8" & 7" by 2 - 8 - 7 = 1 divided by 2 for 1/2". Add that 1/2" to the original bs of 3.75" to get 4.25" & you'll have the same amount of frame clearance as you started with. The tire assembly will move out about the 1/2" you added to the bs - plenty of clearance to the wheell well.

 

[azgn]

you sorta got that calculation backwards....4" BS works "ok" with 8" wheels, but if you want to run big tires, 3.5-3.75 will keep you off the frame

for example, 275 X 60 X 15 Drag radials work fine on 4" BS (8" rim).......275X50 will rub the frame

28X9 slicks will fit with 4" BS......28X10 will not

 

[GNVAIR]

I agree with Woody. The 3.5-3.75" inch works best on 8" rims.

 

[BABY BOEING]

Thanks for the advise guys. I'm kinda screwed in the fact that the wheels I'm getting only come in 3,4,or5in. backspacing. Is it possible that going to a 15*9 wheel with 4in. of backspacing allow me to run 28*10 slicks or should I just go with the 15*8 and hope for the best? Thanks Jon

 

[CPAKCP]

Wheel BS

Will the 3.5" backspacing on an 8" rim give good clearance for a 28X10.50 drag slick?? Or are you better with the 3.75" backspacing?

Thanks in advance

 

[azgn]

either one will work.......may have to roll the fender lip with 3.5...may hit the frame with 3.75...pay your nickle, take your chance...unless your car is low 10's, a 28X9 is MORE than enough slick....and they fit just fine on a 4" BS and 8" wheel

 

[toofastforyou]

Rear wheel offset reply...

On a 8" wide wheel you definitely want no more that 3 1/2"!!! More than that will have your tires to touch the frame for sure!!! I know, that's what I have on my GN. I had special 8" wide "stock" GN wheels made so I could keep the factory appearance but with 8" instead of the stock 7", and I specified a 3 1/2" rear spacing and it looks factory, without any spacers, and with NO tire touching the frame. So 3 1/2" is what you need! I can e-mail a few pics if you want...
'Bye, Claude.