Every car is different... - Team Camaro Tech
Wheels & Tires What fits what?

 
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post #1 of 4 (permalink) Old May 3rd, 12, 09:11 PM Thread Starter
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Dan
 
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Every car is different...

I've been reading a lot on the forum and else where about sizes and options but still need some help. Some common themes out there like the title of this post and "do a search...there's lot of information on this site". I would like to know how what is recommended by anyone here for my setup, but ultimately would like to know how to measure for the right combo for my application and end up with good performance and looks.

Here is I have:
68 Coupe
SPC UCA's (SC&C)
Hotchkis 2" lowering springs and LCA's
Baer Trak4 13" front brakes

Here is what I want:
Front- 18x8 245/40/18
Rear - 18x9 255-275/40/18
Foose Legends 4.5-5.5 back spacing
Also plan to use 1.5" lowering springs in the back
No plans to mini-tub

The sizes above are the numbers I have come across most often and seem to be recommended sizes. I pulled the entire front end off to start the project, so there aren't any wells or fenders to measure from (first timer & learning as I go...hopefully it won't end up costing me too much before its done). Should I just put these back on to measure? And I know I will have to ensure the brakes will fit whatever wheels I go with.

I read somewhere that the overall wheel height should be close to that of a stock wheel in order to get good performance. What is your take on this statement? Could I loose performance if I go too tall or short? Why?

What are the biggest issues with tire sizes? How big of a difference are 275's vice 255's?

-Dan
1968 Camaro (just getting started)
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post #2 of 4 (permalink) Old May 4th, 12, 04:36 AM
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Chuck
 
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Re: Every car is different...

Quote:
Originally Posted by danieldouglass View Post
I read somewhere that the overall wheel height should be close to that of a stock wheel in order to get good performance. What is your take on this statement? Could I loose performance if I go too tall or short? Why?

What are the biggest issues with tire sizes? How big of a difference are 275's vice 255's?
In my opinion, the most critical issue with regard to tire size selection for a driver or cruiser is maintaining adequate clearance for turning and normal driving. It will be difficult to assess the final fit without an actual mock-up of the suspension and body parts. It is possible that some helpful soul who has the same or a very similar combination will offer suggestions but, as you so accurately stated, every car is a bit different, even when similar components are selected. When you're changing either the diameter or the width of the tires on the car, unexpected complications with clearance are the order of the day.

Other than the obvious safety issues of having a tire that is physically capable of doing what you want to do (support the weight of the car, survive the ordinary demands of going around corners, and over speed bumps, normal highway speeds, etc., the diameter of the rear tire is an integral part of the vehicle's final drive gear ratio, i.e., when the diameter is increased beyond that of a stock tire, the numerical gear ratio is reduced. If the diameter of the drive tire is decreased beyond that of a stock tire, the effect is a numerically higher gear ratio. In cars that have had engine and/or gear modifications anyway and that are used strictly for street use, the most noticeable effect of a tire size change is that the speedometer and odometer become less accurate unless internal parts are changed accordingly to compensate.

Changing tire sizes in race cars produces a different finish line RPM, sometimes by only a few hundred numbers but enough to create observable differences on a time slip.
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post #3 of 4 (permalink) Old May 4th, 12, 08:28 AM
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Tom
 
Join Date: Jun 2001
Location: Rochester Mn
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Smile Re: Every car is different...

This post is a sticky in the Wheel and Tires section : https://www.camaros.net/forums/showthread.php?t=153193

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #4 of 4 (permalink) Old May 4th, 12, 05:02 PM Thread Starter
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Dan
 
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Re: Every car is different...

Quote:
Originally Posted by TJS69 View Post
This post is a sticky in the Wheel and Tires section : https://www.camaros.net/forums/showthread.php?t=153193
I meant to post is there. I reposted this in the wheel & tires section.

-Dan
1968 Camaro (just getting started)
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