Drop in mpg after putting on OEM alloys
Member
Joined: Jan 2008
Posts: 4,371
From: NC USA
You need to do that. The calculation is simple but you can go to TireRack's specs and find the exact revs per mile difference.
The calc is section width xtwice the profile in 100th result divided by 25.4 and added to wheel diameter. Example for 195/55x15 tire:
{(195x1.1)/25.4}} + 15 = 23.44" which is spec but may not be exactly a given tire. Molding is not exact.
The calc is section width xtwice the profile in 100th result divided by 25.4 and added to wheel diameter. Example for 195/55x15 tire:
{(195x1.1)/25.4}} + 15 = 23.44" which is spec but may not be exactly a given tire. Molding is not exact.
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Member
Joined: Mar 2008
Posts: 587
From: Wash DC Metro
You need to do that. The calculation is simple but you can go to TireRack's specs and find the exact revs per mile difference.
The calc is section width xtwice the profile in 100th result divided by 25.4 and added to wheel diameter. Example for 195/55x15 tire:
{(195x1.1)/25.4}} + 15 = 23.44" which is spec but may not be exactly a given tire. Molding is not exact.
The calc is section width xtwice the profile in 100th result divided by 25.4 and added to wheel diameter. Example for 195/55x15 tire:
{(195x1.1)/25.4}} + 15 = 23.44" which is spec but may not be exactly a given tire. Molding is not exact.
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