does putting bigger rims change the calibration of your speedometer?
02-22-2002, 07:37 PM
#1
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does putting bigger rims change the calibration of your speedometer?
my friend says that the speedometer works off the revolutions of the rim of yoru car.........thats not true is it?
02-22-2002, 07:50 PM
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Re: does putting bigger rims change the calibration of your speedometer? (CrOmEdOmEcHaMbEr)
I believe it can affect the speedometer, but only if you do not maintain the overall diameter of the wheel/tire. Thats why when you get a larger diameter wheel (16" vs. 14") you compensate for it by getting tires with a lower profile. (less sidewall) As long as you follow the plus sizing rule, it should not be a problem.
02-22-2002, 10:18 PM
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Re: does putting bigger rims change the calibration of your speedometer? (CrOmEdOmEcHaMbEr)
just keep the overall diametre the same ... then it should be fine ...
run a lower profile tire when using larger rims ..
run a lower profile tire when using larger rims ..
02-23-2002, 08:13 AM
#5
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Re: does putting bigger rims change the calibration of your speedometer? (DragonCTR69)
15's will throw it slightly off? Thats odd, because the Si comes with 15's.
02-23-2002, 08:20 AM
#6
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Re: does putting bigger rims change the calibration of your speedometer? (piscorpio)
The SI's speedo is calibrated (as is any other speedo) for the rim/tires sizes the car comes with OE.
02-23-2002, 09:24 AM
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Re: does putting bigger rims change the calibration of your speedometer? (piscorpio)
15's will throw it slightly off? Thats odd, because the Si comes with 15's.
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02-23-2002, 02:01 PM
#9
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Re: does putting bigger rims change the calibration of your speedometer? (piscorpio)
yes of course it will but not to any degree worth worrying about.
02-26-2002, 12:22 PM
#12
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Re: does putting bigger rims change the calibration of your speedometer? (piscorpio)
it's not really the size...but the tires that suck....those michilens are complete ***.
02-26-2002, 04:31 PM
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Re: does putting bigger rims change the calibration of your speedometer? (DragonCTR69)
according to my calculations:
tire size
.d. in inches
185/60-14 =22.74
195/50-15 =22.68
205/50-15 =23.07
205/40-16 =22.46
205/45-16 =23.26
215/40-16 =22.78
205/40-17 =23.46
215/40-17 =23.77
formula is as follows; tire width(mm) x aspect ratio(percentage- example .5 or .45) divided by 12.7(converts to inches) + wheel size = overall diameter of tire.
[Modified by jgale, 8:33 PM 2/26/2002]
tire size
.d. in inches185/60-14 =22.74
195/50-15 =22.68
205/50-15 =23.07
205/40-16 =22.46
205/45-16 =23.26
215/40-16 =22.78
205/40-17 =23.46
215/40-17 =23.77
formula is as follows; tire width(mm) x aspect ratio(percentage- example .5 or .45) divided by 12.7(converts to inches) + wheel size = overall diameter of tire.
[Modified by jgale, 8:33 PM 2/26/2002]
02-26-2002, 07:41 PM
#15
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Re: does putting bigger rims change the calibration of your speedometer? (DragII)
whew, DRAG II, you scared me...I just ordered some 15"s assuming they would be better performance wise, and here you had me thinking I overlooked some weakness in the size or something. They'll be wrapped in Kuhmo's, Ive heard good and bad about the tires, but we'll see!
02-26-2002, 08:33 PM
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Re: does putting bigger rims change the calibration of your speedometer? (piscorpio)
my friend had some kumho's on his 01 CL-S, wore em like a bastard in 5 months
02-27-2002, 03:46 PM
#17
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Re: does putting bigger rims change the calibration of your speedometer? (kappy)
Well, it was a CL type S, was he doing alot of burnouts and fast starts?
I couldnt do a burn out or hard launch if I wanted to!
What I dont get is, the treadwear rating is the same on the Kuhmo's as my stock Dunlops, so why would the Kuhmo's wear faster?
I couldnt do a burn out or hard launch if I wanted to!
What I dont get is, the treadwear rating is the same on the Kuhmo's as my stock Dunlops, so why would the Kuhmo's wear faster?
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