scot w.
GNSperformance.com
- Joined
- Feb 19, 2005
- Messages
- 8,810
Something rarely mentioned or even noticed is "Diameter Difference"
On my set of Toyo Proxy T1R's I had someone recommend the sizes I have on now and even though they fit fine there was one thing that I found WAY off. That is the difference in Diameter! The diameter difference is recommended by Most manufactures to be +or- 2.5% as the MAXIMUM difference in diameters. Well with that said and according to the tire sizes on my car the diameter difference is a whopping 7.7% !! And that is where the "Rake" look comes into play with my car...
After speaking to Richard Winchester @ BFG they also recommend the +/- 2.5% MAX.
So with lowering a car like we did to my white T and to avoid rubbing issues the front tire needs to stay under or just at 25" tall so the front tire will stay 255/35-18 resulting in a 25.03" tall tire.
The rear will now be a 295/30-18 resulting in a 24.97" tall tire giving me a Much better diameter difference of only -o.31 which will also get rid of the 80's "Rake" look!
Once I have my new tires with the new sizes I will post a few pictures....
Here is what I use to size tires properly. Use the TOP portion as your "Front" size and the bottom one as your "Rear" size and you will see the diameter difference... http://www.boosttown.com/wheels_tyres/tyre_size_calculator.php
Here is a better visible comparison of my old tire sizes vs the new.
OLD:
255/35-18 = 25.03" Tall
285/40-18 = 26.98" Tall resulting is a + 7.7% Dia. difference = 1.95" height difference
NEW:
255/35-18 = 25.03'' Tall
295/30-18 = 24.97" Tall Resulting in a - 0.31% Dia. difference = 0.06" Height difference
.
On my set of Toyo Proxy T1R's I had someone recommend the sizes I have on now and even though they fit fine there was one thing that I found WAY off. That is the difference in Diameter! The diameter difference is recommended by Most manufactures to be +or- 2.5% as the MAXIMUM difference in diameters. Well with that said and according to the tire sizes on my car the diameter difference is a whopping 7.7% !! And that is where the "Rake" look comes into play with my car...
After speaking to Richard Winchester @ BFG they also recommend the +/- 2.5% MAX.
So with lowering a car like we did to my white T and to avoid rubbing issues the front tire needs to stay under or just at 25" tall so the front tire will stay 255/35-18 resulting in a 25.03" tall tire.
The rear will now be a 295/30-18 resulting in a 24.97" tall tire giving me a Much better diameter difference of only -o.31 which will also get rid of the 80's "Rake" look!
Once I have my new tires with the new sizes I will post a few pictures....
Here is what I use to size tires properly. Use the TOP portion as your "Front" size and the bottom one as your "Rear" size and you will see the diameter difference... http://www.boosttown.com/wheels_tyres/tyre_size_calculator.php
Here is a better visible comparison of my old tire sizes vs the new.
OLD:
255/35-18 = 25.03" Tall
285/40-18 = 26.98" Tall resulting is a + 7.7% Dia. difference = 1.95" height difference
NEW:
255/35-18 = 25.03'' Tall
295/30-18 = 24.97" Tall Resulting in a - 0.31% Dia. difference = 0.06" Height difference
.