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Discussion Starter · #1 ·
Hi all, reconsidering my plans for 17's and am thinking of staying with my 15" rally wheels. I haven't had a chance to measure the B.S. on the wheel or what width the wheel itself is but I have 275/60/15 Protracs in the rear on there now(14+ years old!). I've read here about needing 5.5" B.S. to fit 295's. I doubt those wheels have that much, so my questions are... what would the minimum B.S. be to run 295's and more importantly, is there that much of a visual difference between 275 and 295 width tire? I'm not too familiar with the tire # meanings, would there be a 1/4" difference, 1/2"?, 3/4"?, 1"?(again, visually) Basically I'm not going to justify new wheels just to go to a slightly (visually) larger tire. Thanks for any info guys,

George
 

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SS468RATT said:
I have 275/60/15 Protracs in the rear on there now(14+ years old!)...

is there that much of a visual difference between 275 and 295 width tire? I'm not too familiar with the tire # meanings, would there be a 1/4" difference, 1/2"?, 3/4"?, 1"?(again, visually) Basically I'm not going to justify new wheels just to go to a slightly (visually) larger tire. Thanks for any info guys,

George
George,

The tire # (275, 295, etc) represent the width of the tire, in millimeters. So the 295 is 20 mm wider than the 275 (although it will vary between brands/lines/etc)...

so basically, the 295 will be about 3/4" wider overall than the 275... stick out 3/8" on each side compared to what you now have... Do you have 3/*" clearance to the outer wheelwell lip? If clearance is tight on the inside, you could run a small thin spacer, but on the outside, there's not much you can do without new rims...

Another thing to consider. Not totally sure, but aren't ProTracs going to be a tall tire? the 295s I have seen are usually lower profile (50s or 60s)...


You can go to most tire manufactures websites, and they will often have the specs for their tires (height and width, etc)...

Tire#: example; 295/50-15, 295 is width in mm, 50 means the sidewall is 50% of the width and the 15 is the rim size (diameter)...

for this example, the overall tire height will be approximately:
295 mm * 0.50 = 147.5 mm... 147.5 mm * 2 (for 2 sidewalls, top and bottom) = 295 mm = 11.61 inches...
11.61 + 15 = 26.61 inches = approximate height...
 

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Discussion Starter · #3 ·
Thanks Tony, I just ran out there and measured: I have 1" from outer edge of tire to the unrolled fender lip, about 1 1/2" between inner frame rail and inner edge of tire. You are right about the Pro-trac being "tallish" even though the size is 275 / 60. by my measurements and your advice it seems like I should have enough room for a 3/4" wider 295/50/15 tire, right? Right now I don't have any air in the air bags and the top of the tire is below the edge of the fender, so a lower sidewall like a 50 would provide me even more room for width. Next chance I get, I'll measure the BS, maybe it's larger than I thought?

Thanks, George
 

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I have 295/50 R15 on my 69. No issues. What is a good replacement tire. My tires are old and dry, no traction.
Is your Car lowered in the Back ?
Does it have the Stock Width Rearend in it ??
If so you may need a Wheel with a BackSpace of more than what I use on my Car !

I have run a set of these Tires on the Street for 6+ Years with good Traction on my 67 with a 60" Wide Rearend
& Ground to under Fender Lip = 26" // on a 15" x 8" Wheel with a 4.5" BackSpace //
M/T Sportsman S/R # 6641 28'' x 12''R x 15''LT TreadWidth 10.4"/ SWW 12.1"/Dia 28"
Mickey Thompson 6641: Sportsman S/R Radial 28X12R15LT | JEGS $ 267.us

710878

710879

710881


Now run a set of these Tires on the Street, but will not likely last more than 3 years and another set for the Track
on a 15" x 10" Wheel with a 5.5" BackSpace // that have very Soft Rubber Compound
M/T ET Street S/S # 3454 295/55/15 = 10.6” Tread Width / 12.2” SWW / 27.8” Dia.
Mickey Thompson 3454: ET Street S/S Radial Tire P295/55R15 | JEGS $ 238.us

710882

710883
 
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When you run the 295 it really like a 10 inch rim if you could fit it. On the 10 inch rim it will look a bigger than say a 275 on a 8 inch part is the 275 vs 295 the other part is the 10 inch rim really kicks out the sides. With 10 inch rim the 295-50-15 is like 12.4 inches while the 275-60-15 on an 8 inch rim is like 11-11.2 inches. Here is a 295-50-15 Avon AC Cobra tire on a 10 inch rim on Chevelle - it really plants the tread flat on the ground. These are 12.4 inches side to side.



avon1.jpg
 

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When you run the 295 it really like a 10 inch rim if you could fit it. On the 10 inch rim it will look a bigger than say a 275 on a 8 inch part is the 275 vs 295 the other part is the 10 inch rim really kicks out the sides. With 10 inch rim the 295-50-15 is like 12.4 inches while the 275-60-15 on an 8 inch rim is like 11-11.2 inches. Here is a 295-50-15 Avon AC Cobra tire on a 10 inch rim on Chevelle - it really plants the tread flat on the ground. These are 12.4 inches side to side.


Whats the offset on the wheels?
 

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6.25 inches backspacing - I could still do like 5.50-5.75 inches and be ok. On my 1965 Chevelle the rear fenders have been modified to with 1980 Grand Prix fender lips.

chevelle fender.jpg
chevelleside.jpg


chevelle fender.jpg
 
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