10 Bolt 70 Chevelle- Weld RT-S 18x10 Backspacing

[Shiner]

I am looking to put Weld RT-S S71 wheels on my 1970 Chevelle (2" drop) and 10 bolt rear end. The car will have Baer SS4 rear calipers.

I do not have a tool but I am wondering what my backspacing will be... I am not mini tubbed. I am wanting to do a 18x10 with a 315 tire but I am thinking of going with a 305/40 ET Street...


ALSO is anyone on here a Weld Dealer that I could get a good price on these wheels and tires?

Any advice?

[Shiner]

modifications in siganture

[Vince@Meanstreets]

It is best to measure for yourself since all cars are different.

From the cars we get in the shop the average is 5 3/4" to 6" back spacing. One was 5 1/2" but that was due to exhaust tailpipe routing.

[Shiner]

If I have 15x8 5.5" BS and I like the way the fill the wheel wells and I then want to put a 10" wheel would I need to get a 7.5" BS(to accommodate for the 2" wider wheel?

[Vince@Meanstreets]

Originally Posted by Shiner

If I have 15x8 5.5" BS and I like the way the fill the wheel wells and I then want to put a 10" wheel would I need to get a 7.5" BS(to accommodate for the 2" wider wheel?

So a 15x8 and a 5.5 BS will actually take more due to tire bulge. Im assuming you are running a 255 tire? 255 on an 8 is 3/8" average. The actual back space available would be 5 3/4" taking the tire bulge into account.

On an 18 or 17 wheel the tire bulge is less.

I would measure what you have then subract an 1" min for articulation room. For a 305 or 315 on a 10" wide you will need 12" of space. Average 70 Chevelle wheel tub is 14-14 1/2" wide. 1/2" to the outer and 1 1/2" to the inner should do.

Jack up the back and pull the wheels. Let see what you have?

[Shiner]

Wish you would just tell me, "Travis get the rears with 6" BS and the fronts with 5""

[Shiner]

Originally Posted by Vince@Meanstreets

So a 15x8 and a 5.5 BS will actually take more due to tire bulge. Im assuming you are running a 255 tire? 255 on an 8 is 3/8" average. The actual back space available would be 5 3/4" taking the tire bulge into account.

On an 18 or 17 wheel the tire bulge is less.

I would measure what you have then subract an 1" min for articulation room. For a 305 or 315 on a 10" wide you will need 12" of space. Average 70 Chevelle wheel tub is 14-14 1/2" wide. 1/2" to the outer and 1 1/2" to the inner should do.

Jack up the back and pull the wheels. Let see what you have?

Outer: 1"
Inner: 2"

Section Width 11"

Weld recommended I go with a 6.1 and run .25" spacers if I need to.