1971 Riviera tire size options.

Thanks for the offer, I just use http://www.tacomaworld.com/forum/tirecalc.php

 

I got sick of doing it one at a time and trying to remember

A year ago 275/60/15 rears & 225/70/15 front:


Yesterday 275/55/17 & 235/55/17:


Found out v8buick hates excel but loves pdfs
View attachment Tire Size.pdf

 

Nice looking wheels and tires!

 

crazyjackcsa,
Can you repost a picture of what this ended up looking like if you still have the pic. I just bought a 71 and looking to put new tires on. Thanks!

 

I know this is an old thread, but I'm glad the Tax Man has revived it. I have a '71 Riviera. The original 6" rims have 215/75R15 tires, and there is a lot of room in the wheel wells. I'm now switching to some early 1980s 15x7 rallys. I am thinking of putting 255/70R15 tires on the rear, and 235/70R15s on the front. Does anyone think that would be a problem in terms of the width of the 7" rims or space in the wheel wells? Will there be any issues with the 4.25" or 4.5" backspacing on the 7" rims?

Thanks very much for any thoughts.
Dave

 

No problems at all, but did you check the bolt patern on those 80's Rallye wheels?
Only wagons and Electras (LeSabre: only sedans with the HD package) came with the 5 x 5 rims.

 

Yup, I know the problem, because the first set I got did NOT fit--but these do. Thanks!
Dave

 

15x7 with 235/70r15 on the front. 15x8 with 255/70r15 on the back.

 

Jerrit, that looks awesome! And I think my '71 is almost the same color.

One question: I have 4 15x7" rallys. Do you see any problem putting the 255s on a 7" rim in the rear?

Thanks.
Dave

 

255's are 25.5 cm wide.
7J = 7 inches = 17.78 cm

So the tires are 7.72 cm wider than the rim.
That's 3.86 cm on each side of the rim, or 1,51 inch.
That will not really cause the "balloon-effect".

 

Got it, thanks very much!

 

I don't think you'll have any issues with the 7 inch rims. Looks like Nailhead already gave you a good explanation.

 

Yup, he did. Thanks.