Team Camaro Tech banner

1 - 8 of 8 Posts

·
Registered
Joined
·
511 Posts
Discussion Starter #1 (Edited)
I am getting ready for the power tour and have a set of 17 x 7 with 4" bs and 17x8 also with 4" bs.T he tires are 245/45/17s front and rear. I would like a slightly taller tire on the rear. Should I go with a 255/50/17 on the rear?How about a 255/45/17? Need help quick! Need to get them right away . By the the way this is for a 67 RS.
 

·
Premium Member
Joined
·
2,411 Posts
I would go with the P255/45/17. Here is why and I will use my car for an example. I have P235/60R15 all the way around. That size is pretty close to what the factory used on First Gen's. P235/60/R15 was also used to replace P215/65/R15's on 1982-1987 Z28's and 1985-1990 IROC-Z's with 15" wheels.

Ok so now lets compare overall diameter shall we

P255/50/R17 = 27.03 Inches
P255/45/R17 = 26.03 Inches
P235/60R15 = 26.10 Inches

As you can see the P255/45/R17 is very close to what I have in diameter. That should clear based on what you have. I believe the standard backspacing on my 15x7 Rally's is 4.25" Most places will try to sell you a Z speed rating or higher. Unless your are trying to keep up with F1 Ferrari's or Indy Cars you don't need Z speed rating. The first or or second gen Camaro was never designed with that type of suspension. All you need is an S or T speed rating and you will be fine. But in a 17" tire it's usally H or better. The higher the speed rating the stiffer the sidewall which generally will improve your handling. Be careful though Z Rated tires never were known much for wet traction. Now the highest speed rating is Y. If you like the Power Tour and want a 17" tire and one that should clear--- Go with an H speed rated P255/45/17. Most places want to sell you the highest speed rating in a first or second gen. A 1967 RS or 1969 RS are not 1989 1LE IROC-Z's. They are not ZR1 Corvette's or Z06 Corvette's. High Speed Radials cost alot of money. Here is a cool link on tire speed ratings. http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35

The rest below I copied & pasted from this website. Cool tuff as you can compare tire sizes. Here is the link. Just eneter what you have or want. http://www.1010tires.com/TireSizeCalculator.asp?action=submit


Stock Tire >Search Tires Tire 1 - 255/50R17 >Search Tires Tire 2 - 255/45R17 >Search Tires Tire 3 - 235/60R15 >Search Tires
Section Width: - -
Section Width: 10.03 in 255 mm
Section Width: 10.03 in 255 mm
Section Width: 9.25 in 235 mm

Rim Diameter: - -
Rim Diameter: 17 in 431.8 mm
Rim Diameter: 17 in 431.8 mm
Rim Diameter: 15 in 381 mm

Rim Width Range:
Rim Width Range: 7 - 9 in
Rim Width Range: 8 - 9.5 in
Rim Width Range: 6.5 - 8.5 in

Overall Diameter: - -
Overall Diameter: 27.03 in 686.56 mm
Overall Diameter: 26.03 in 661.16 mm
Overall Diameter: 26.10 in 662.94 mm

Sidewall Height: - -
Sidewall Height: 5.01 in 127.25 mm
Sidewall Height: 4.51 in 114.55 mm
Sidewall Height: 5.55 in 140.97 mm

Radius: - -
Radius: 13.51 in 343.15 mm
Radius: 13.01 in 330.45 mm
Radius: 13.05 in 331.47 mm

Circumference: - -
Circumference: 84.91 in 2156.7 mm
Circumference: 81.77 in 2076.9 mm
Circumference: 81.99 in 2082.5 mm

Revs per Mile: -
Revs per Mile: 769.5
Revs per Mile: 799.0
Revs per Mile: 796.9

Speedometer1: mph km/h
Speedometer1: mph km/h
Speedometer1: mph km/h

Speedometer Difference: % Speedometer Difference: % Speedometer Difference: %
Diameter Difference: % Diameter Difference: % Diameter Difference: %


Good Luck!!
 

·
Registered
Joined
·
511 Posts
Discussion Starter #3
I also have 15x7 rallys with 235/60/15 tires front and rear. I may put them back on because the ride is much better.I dont enjoy driving my car when it shakes everything loose. We have bad roads in Ms.
 

·
Registered
Joined
·
511 Posts
Discussion Starter #4
Thanks for the info. Just dont think Im sold on 17" wheels for my 67.Love the looks, hate the ride . Got to be hard on ball joints , tie rods ,etc.
 

·
Premium Member
Joined
·
2,411 Posts
Yes, the real low profile skinny tires that are way to small for the car would eat ball joint & tires This was real common when kids would put P205/50/R15 on a 4x4 Chevy Blazer from the late 1980's or early 1990's that came with P235/75/R15 from the factory.

You will like the ride quality of the P235/60R15. If you are not sold on 17's, that is what I would go with (P235/60/R15)

P.S. The roads in Chicago & The surrounding Suburbs $*ck as well.
 

·
Registered
Joined
·
511 Posts
Discussion Starter #6
Put the rallys back on today with a new set of BFGs , 235/60 front 245/60 rear. Drives great. Putting the 17s on hold for now.
 

·
Registered
Joined
·
2,353 Posts
when ever you decide that you do want the 17" you need to get them with more than 4" of backspacing
and if I had a vote I would go with 17" the ride is not bad, you still have a 40 series tire, plenty of rubber
 

·
Registered
Joined
·
511 Posts
Discussion Starter #8
Thanks. 4" front and 4 3/4 rear is what american racing recomends. I will refer back to this site also. Good info.
 
1 - 8 of 8 Posts
Top