30, 35, or 40/18?
Thread Starter
TECH Regular
Joined: Jun 2006
Posts: 440
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From: Alamo Heights, Texas
30, 35, or 40/18? I want traction, and will be getting drag radials between 305-315 for my 10.5 inch wheels. Now I need to decide if I should get 30, 35, or 40 height. My car has 3.23's in a 6 speed(roll race only car), I will not launch this car prolly ever(At least on this rear end), but there will be alot of spirited driving including in first gear. Will the smaller side wall of a 30 make much difference? How much does each tire size change the final drive ratio?
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I want traction, and will be getting drag radials between 305-315 for my 10.5 inch wheels. Now I need to decide if I should get 30, 35, or 40 height. My car has 3.23's in a 6 speed(roll race only car), I will not launch this car prolly ever(At least on this rear end), but there will be alot of spirited driving including in first gear. Will the smaller side wall of a 30 make much difference? How much does each tire size change the final drive ratio?
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Joined: Apr 2003
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From: here, ny
the height goes up because its a percentage of the width... thats y u lower the ratio when u goto a larger diameter... 275/40, the height is 40% of the width... 275/35, the height is 35% of the width... 305/35, the height is 35% of the width, and 305 is larger than 275...
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From: Bay Area, CA
Thread Starter
TECH Regular
Joined: Jun 2006
Posts: 440
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From: Alamo Heights, Texas
My car is a 6 speed(with 3.23's, swapped rear). It's already modded(hammered/rolled) to run 345 slicks, so not worried about any of that really. The car will be at about 425 to the wheels on motor, with a 150 shot soon after the wheels get on it.
I've been seeing some pictures of a 335 on a 10.5 inch wheel and it actually looks nice, wondering how safe it is for cornering though.
I've been seeing some pictures of a 335 on a 10.5 inch wheel and it actually looks nice, wondering how safe it is for cornering though.
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Joined: May 2009
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From: Honolulu, HI
Tire height will matter because of 2 reasons
1. You gear ratios WILL change/ (in a good way or bad), speedo will be off without proper tuning,
2. lower profile tires= less side wall flex= better handling, but less hooking traction.
1. You gear ratios WILL change/ (in a good way or bad), speedo will be off without proper tuning,
2. lower profile tires= less side wall flex= better handling, but less hooking traction.
