Wheel/Tire sizing question. Opinions wanted

[rusch49]

I have a 77 c-10 lwb.  Currently stock ride height, but considering 2"/4" drop.   I would like to run corvette/camaro rally wheels with BFG radial t/a's.  I was originally thinking 15x8's (4" backspacing) with 275/60's all the way around, but realized the rear axle is 2" narrower than the front end.   Couldn't find 15x8 with 3" backspacing, so I was thinking that going to a 15x10 in the rear with 4.5" backspacing should just about be right.   Thoughts?  I guess my biggest question is... would the tire profile change much when mounting the same tire on a 15x8 vs. 15x10?  I don't want it to look like I have a shorter tire on the back.  Does that make sense?   Any advice/feedback would be appreciated. 

[Da67goatman]

I'm pretty sure only the 4x4 had narrower front than rear.  I know my 2wd 'burban is just about exactly even front to rear.  Have you measured?  You could always get some spacers to push out the rear if necessary.

[rusch49]

I'm pretty sure the rear is narrower.  I can tell by looking at it from the rear, so I took some rough measurements and appeared to be about 2" overall.  Also, not really interested in the spacer idea.  I've heard too many negatives about that.  Thanks.

[Da67goatman]

I've ran spacers both slip on and bolt on and never had a single issue.  I am totally opposed to staggering wheels, its impractical.  Usually you can run the same wheel/tire combo on both axles.  I say pick either the 8" or 10" and run em all round.

[Captkaos]

All rear axles were narrow by GM design for steering purposes.
You can mount 275 wide tires on either 8 or 10" with the same tire, I wouldn't go wider than that as it will look strange on the thinner wheel and isn't recommended.

[rusch49]

Thanks for the advice.  Still not sure which way to go.  I like the idea of wider tires on the back, but also good having all the same size for rotation purposes.  Decisions, decisions....