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02-25-2013, 04:14 PM
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#1 | | nuggets mod
Join Date: Feb 2002 Location: richmond
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| Is a 1/2" smaller overall diameter ok?
My stock wheels/tires are: 255/45/17, total diameter of 26.03"
What would be the negative effects of replacing these with:
front: 235/35/19, total diameter of 25.47"
rear: 265/30/19, total diameter of 25.25"
For reference, stock 19s for my car come in:
front: 255/35/19, total diameter of 26.02"
rear: 285/30/19, total diameter of 25.73"
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02-25-2013, 08:29 PM
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#2 | | I contribute to threads in the offtopic forum
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It'll be like having slightly deeper gears giving you slightly quicker acceleration and your speedo will read slightly faster then you are going.
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02-26-2013, 10:03 AM
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#3 | | nuggets mod
Join Date: Feb 2002 Location: richmond
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| Quote:
Originally Posted by Phil@rise  It'll be like having slightly deeper gears giving you slightly quicker acceleration and your speedo will read slightly faster then you are going. | Thanks! So there will be no long (or short) term negative impact on the car?
If it's just the speedo reading off by a few kmph, that's fine with me..
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02-26-2013, 06:48 PM
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#4 | | Wunder? Wonder?? Wander???
Join Date: Oct 2011 Location: vancouver
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since ur 265 30 19 is smaller than 255 45 17 by 3% or so, when u accelerate hard u will activate ur abs and tcs if u have it. that can screw up gears like rear diff and tranny coz its spinning too fast according to ur gear ratio.
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02-28-2013, 11:39 PM
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#5 | | I STILL don't get it
Join Date: Mar 2011 Location: Burnaby
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| Quote:
Originally Posted by gc200 since ur 265 30 19 is smaller than 255 45 17 by 3% or so, when u accelerate hard u will activate ur abs and tcs if u have it. that can screw up gears like rear diff and tranny coz its spinning too fast according to ur gear ratio. |  curious how that works...tcs is usually set up to detect difference in wheel speed between all four wheels. if he's replacing one tire on one side with the 3% bigger tire then yeh maybe his tcs would kick in
by replacing all 4 tires, he'll be decreasing all 4 tires at the same time, making the sensors see the wheels move at the same rate, causing no tcs/abs/broken gears. just like what phil said, it'll just be accelerating 3% faster, and showing a speedo difference of 3%
more so, his car's stock 19s front-to-rear difference on his car is 1.1% (26.02/25.73), going to his chosen tires would be 0.9% (25.47/25.25). 0.2% is most likely under the parameters for TCS/abs to kick in if it's set up to expect a certain front-to-rear wheel speed difference
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03-01-2013, 07:33 AM
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#6 | | Wunder? Wonder?? Wander???
Join Date: Oct 2011 Location: vancouver
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just telling what i xperienced. OP can always ignore my post but let us know.
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