Within the next week, I hope to be picking up a set of 2000 Camaro SS 17x9 10 spoke rims. From what I can find on TGO, I will need (2) 5x4.75 2" adapters for the rear and (2) 2.25" adapters for the front. I will also need a set of 275/40r17 all around to keep the speedo in check. Does everything here sound right and make sense? Please give me some insight, as this is the first time I have played around with different wheels.

 

Deleted

 

TTT

 

Nobody?

 

Yes, sounds right.

I have stock Vette wheels on my car, about 97 or so; stock tire sizes for that car, which I can't recall exactly off the top of my head; same basic fitment (offset/backspacing) and similar tire size; 2" is what I used.

No significant effect on speedo, their OD is essentially the same as the stock sizes for our cars.

 

All 3rd gen stock tire height is close to 26" here is the math.

Using P245 50 R16 tire simply means sidewall is 50% the tread width in mm..

so converting to inches... you get 245/25.4 = 9.65" tread width

9.65 X .50 = 4.83 sidewall...

SO 16" wheel + 4.83 + 4.83 = 25.66 tire height..


checking P275 40 R 17 you have...

275 / 25.4 = 10.83 sidewall X .40 = 4.33

17+ 4.33 +4.33 = 25.66 tire height.

NO CHANGE FROM STOCK TIRE HEIGHT

 

i had the same setup on my ride for a couple years, 2002 ss wheels 285/40/17 on rear 245/45 front. pics in sig link

 

The 1st number on tires (245 or whatever) is NOT "tread width".

It's "section width". Which is, the width across the widest place, at nominal inflation and load; usually somewhere in the middle of the sidewall.

Tread is ALWAYS narrower than that.

Since no 2 tires are designed the same even from the same mfr, let alone different mfrs, all that "calculation" based on the advertised "trade size" has HHHHHHUUUUUUUUUUJJJJJJJJJJJJJJJE errors in it. Take it as a crude approximation AT BEST.

That said, 25½ - 26½" ACTUAL MEASURED OD is what these cars need; as long as whatever tires you end up with are about that OD, life will be fine. (and of course, the wheel spacing...)

1" out of 25" is a 4% error in the speedo: around 2½ mph at 60, 1¼ mph at 30, 5 mph at 120, etc. Not worth worrying about. You can pick out the "perfect" tire, "perfect" speedo gears, "perfect" everything; and end up with that much error just from underinflation, tread wear, and a bunch of new stereo equipment. And, considering that the increments on a 5-spd are even COARSER THAN THAT (tooth count is in the 19 - 22 kind of range, meaning, that's the finest adjustment you can possibly make), as long as you stay in that general ACTUAL MEASURED (NOT "calculated") tire OD, you'll be in good shape.

Did I mention about ACTUAL MEASURED enough? A tape measure is your friend.

 

He asked for someone to double check his math which I did, and you want to quibble about semantics. perhaps now that he knows how to do it

section width, tread width.. big deal... THE MATH IS STILL CORRECT

 

http://www.michelinman.com/tires-101...-sidewall.page

 

So what.

Doesn't make it actually mean anything.

Garbage in, garbage out.

(yes I'm a math teacher in my spare time; university business statistics to be specific)

 

actually it does mean something: it means the new tire is the same height as the old one..




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