Wheel sizing vs. power question

daisuke149 · 03-18-2012, 09:27 AM

Quote:

Originally Posted by harman.khinda

Okay increasing diameter of the wheels will allow for bigger brakes, increase turn-in response, reduce acceleration but increase top speed.

Also well a 17inch rims and 18 inch rim may have the same rolling diameter (difference in sidewall height) and mass. Having more of the mass near the outside of the wheel will hurt performance compared to having more the mass near the center of the wheel. So going with a lighter weight tire helps a lot.

it wont increase top speed....

some of you guys are making generalizations without understanding how it works.

the overall diameter of the wheel + tire is the item your looking for + weight.

If the wheel weights more, even if its the same size as your OEM, it would slow you down. Whether or not you will feel it, would be determined by how much weight is added.

If you upsize your wheels, you can downsize the side wall ratio to keep the same overall OEM diameter and therefor your TOP speed / acceleration would not be altered DUE to the size. it would, most likely be altered due to the weight and the shifting of the weight load to the outer radius where it would sap the most power.

I went to a 20x12 wheel, with a 325/25/20.

Run the calculations on the overall diameter compared toa 275/35/19. You will find my overall diameter is shorter by about .17" which technically means i should accelerate faster. but since its a 20x12 wheel with massive rubber, i know it weighs more than the OEM and therefore realistically would slow me down. Can i feel it? not really. I dont go full throttle everytime i drive my car all day long and so i wasnt attuned to the oem vs these. the car is still quick as hell.

harman.khinda · 03-18-2012, 10:01 AM

Quote:

Originally Posted by daisuke149

it wont increase top speed....

some of you guys are making generalizations without understanding how it works.

the overall diameter of the wheel + tire is the item your looking for + weight.

If the wheel weights more, even if its the same size as your OEM, it would slow you down. Whether or not you will feel it, would be determined by how much weight is added.

If you upsize your wheels, you can downsize the side wall ratio to keep the same overall OEM diameter and therefor your TOP speed / acceleration would not be altered DUE to the size. it would, most likely be altered due to the weight and the shifting of the weight load to the outer radius where it would sap the most power.

I went to a 20x12 wheel, with a 325/25/20.

Run the calculations on the overall diameter compared toa 275/35/19. You will find my overall diameter is shorter by about .17" which technically means i should accelerate faster. but since its a 20x12 wheel with massive rubber, i know it weighs more than the OEM and therefore realistically would slow me down. Can i feel it? not really. I dont go full throttle everytime i drive my car all day long and so i wasnt attuned to the oem vs these. the car is still quick as hell.

I meant increasing overall diameter will increase top speed.

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