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Suspension Questions Chassis, Brakes, Springs, Shocks, Swaybars, Tire, Rims Etc Suspension Questions Chassis, Brakes, Springs, Shocks, Swaybars, Tire, Rims Etc


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Old 03-22-2019, 09:33 AM
BigDaddy65 BigDaddy65 is offline
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Location: Knoxville TN
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Default 15 inch tire sizes???

Hi all...

Looking for some tire sizes for my 64 stepside...ive got the rally 15x8 6 lug wheels. Will different tire sizes affect anything while driving?...Not going to use my truck for any racing. Ive got stock 4.11 gears and new disk all around..

And yes ive tried researching tire sizes but im getting old!!!

thanks in advance

Duane
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Old 03-27-2019, 10:11 PM
Evan's C10 Evan's C10 is offline
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Duane,
While I don't know for sure what you are asking about the different tire sizes affecting anything while driving I can tell you how tire sizing works. With a tire size, 235/75R15 the 235 is the width of the tread face in millimeters. The 75 is the is the ratio of the sidewall height to the tread face, in this case it is 75%, the R is radial and the 15 is the rim size. So, for that tire, the sidewall is 176.25 mm tall. If you were to go to a 215, for the same sidewall size you would have to have a 215/82R15. But tires are only manufactured in increments of 5 such as XXX/65, XXX/70, XXX/75, etc. From geometry we know that when you increase the sidewall height for the same rim size you increase the overall diameter , radius and circumference.
So when you change tire sizes you will change the circumference and thus the number to times it rotates per mile and thus the speedometer calibration. For example, if you go from a 245/75R15 to a 215/75R15 you will be off by about 6%. Not major, but some. This is not as important as changing rear gear ratios.

Or as another example, my daily driver Colorado Centennial Edition came with 265/60/18 tires. For next winter I plan to get the 16" steel rims to take off the polished aluminum rims. The factory tire size for the steel rims are 265/70R16. As unbelievable as it seems, the two tire circumferences are less than 1% different even though the rim sizes are 2" apart.

I hope that helps out a little bit.
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Old 03-28-2019, 09:13 AM
1968C10 1968C10 is offline
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Quote:
Originally Posted by BigDaddy65 View Post
Hi all...

Looking for some tire sizes for my 64 stepside...ive got the rally 15x8 6 lug wheels. Will different tire sizes affect anything while driving?...Not going to use my truck for any racing. Ive got stock 4.11 gears and new disk all around..

And yes ive tried researching tire sizes but im getting old!!!

thanks in advance

Duane
Duane, I just installed Cooper Discoverer AT3s on my '68 C10 (255/70R15) and they drive and look great. Not too aggressive appearance but still a period look. Good luck
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Old 03-30-2019, 04:06 PM
BigDaddy65 BigDaddy65 is offline
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Location: Knoxville TN
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Oh cool....yes that does make a little more sense now. The only thing I'm still confused about is the rear end gear ratio?? I have the 4.11 gears on my truck currently. So I need a size tire that has low revolutions per mile to offset my high gear ratio?


235/75R15 has 699 revolutions per mile...or 255/70R15 has 694 revolutions per mile. I figure either will work as I have the 350/turbo 350 combo!!!!!


Thanks guys I really needed the help!!!

Duane
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