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Trying to calculate 1% AWD difference. Help.
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10-12-2014, 08:36 PM | #1 |
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Trying to calculate 1% AWD difference. Help.
So, I'm trying to figure out how to use the calculator.. I think I'm obviously using it wrong
So, I'm thinking about getting new wheels and I'm trying to figure out if it's okay to be within these 2 options of specs.. Using these wheel specs: 19x9.5 +22 19x11 +25 My original specs that always worked was: 235/35/19 265/30/19 OPTION #1 225/35/19 265/30/19 OPTIONS #2 235/35/19 255/30/19 Will either option #1 or #2 work to stay within the 1%? I'll be using V12s. Thanks in advanced.
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10-12-2014, 09:29 PM | #2 | |
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Option 2: 1.8% - No Go And FYI, if you go to the wheels and tires forum, there is a calculator at the top of the page that will help you figure out future combinations. |
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10-13-2014, 08:04 AM | #3 | |
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My other option is to give it some stretch and go 225/35/18 & 255/30/18
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10-13-2014, 08:40 AM | #5 | |
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I guess I'm going to go with the 225/35 255/30 Lot's of poke
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10-13-2014, 10:18 AM | #7 |
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you can also look up revs per mile on Tire Rack's spec sheet
http://www.tirerack.com/tires/tires....entus+V12+evo2 if those are within 1% you're GTG, although obviously the closer the better. |
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10-13-2014, 10:23 AM | #8 | |
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10-13-2014, 10:57 AM | #9 |
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Using the revs per mile or actual diameter from tirerack will be a little more accurate because those numbers are based on the actual dimensions of the specific tire rather than the nominal dimensions for that size.
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10-16-2014, 01:17 PM | #10 |
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I would not recommend option 1 either. The front tire diameter needs to be equal to or larger than the diameter of the rears and then also within 1%. Stay away from smaller front tires.
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10-16-2014, 01:24 PM | #11 |
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You're the only one that didn't recommend optiopn #1. I don't know if everyone is doing the same math. Now I'm lost.
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10-16-2014, 05:22 PM | #12 |
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235/35/19 and 275/30/19 are basically the same diameter (only 0.077% difference).
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2007 335xi 6AT | Cobb Stage1+ | BMS DCI | VRSF 7" IC | FA 500 400#F/600#R | ARC8 17x9 et30 | RE-11a 255/40/17
Parting out car. For sale thread here: http://www.e90post.com/forums/showthread.php?t=1167583 |
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10-16-2014, 06:30 PM | #15 |
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10-17-2014, 06:03 AM | #17 |
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offsets dont matter when it comes to matching up tire diameter. What width are the rears? If its 10.5 or 11, your good to go. Tire stretching CAN affect diameter.
For example: 225/40/19 on 9.5 width VS 225/40/19 on 10,10.5, or 11 would not have same rolling diameter even though tires are same size. |
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10-17-2014, 08:26 AM | #18 | |
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10-17-2014, 08:34 AM | #19 | |
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http://www.willtheyfit.com/index.php...et2=25#content |
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10-17-2014, 02:52 PM | #20 | |
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While most problems were caused when the 1% rule was grossly ignored some were caused when the front diameter is less than the rear. Read my responses to one of the posts here. http://www.e90post.com/forums/showthread.php?t=995827 If you want to go with the 255/30-19 rear then 225/35-19 is the correct front sizing. As others have said 235/35 F with 265 or 275/30 rear are also common and safe options. |
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