Larger wheels= Lower milage?
#1
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Larger wheels= Lower milage?
Do having these wheels in this picture cause the odometer to read lower than actual mileage? Is the speedo effected? Any difference here between the analog display and the 89+ digital? I know the wheels are larger than stock but is the overall radius with the tire also larger? I would assume there are lower profile tires one can get to keep the actual radius the same as stock when using larger wheels, correct?
#3
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Yes, it's the rear tire diameter [EDIT: FRONT tires beginning in 91] that effects the speedometer and odometer reading, regardless of analog or digital. Stock tires are ABOUT 25". You can get all kinds of tire diameters depending on the profile you choose and the manufacturer, regardless of wheel size.
Last edited by Bill Ball; 01-26-2008 at 04:19 PM.
#4
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My rear tires are 6.7% taller than stock and 54lbs heavier than my 16" too..... My mileage is slightly down compared to the smaller less grippy 16" tires...maybe 1 mpg average......
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#7
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Stock 928 tires vary from 24.7-25" in diamter (by standard calculations, actual tires vary even more). I think it was DR that told me not to go over 26". Most of us run tires that are 24.7-25.6".
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#8
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Just checked, 25 in. all around so I guess I don't need to worry about incorrect readings. Thanks for the quick answers.
Iceman, 57 lbs heavier for all four so each wheel is 14+ lbs heavier than stock? What wheels do you have, and is that weight just the wheel or wheel with the tire on? It seems like a lot of weight but then again I am not all that knowledgeable about the subject.
Iceman, 57 lbs heavier for all four so each wheel is 14+ lbs heavier than stock? What wheels do you have, and is that weight just the wheel or wheel with the tire on? It seems like a lot of weight but then again I am not all that knowledgeable about the subject.
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Just checked, 25 in. all around so I guess I don't need to worry about incorrect readings. Thanks for the quick answers.
Iceman, 57 lbs heavier for all four so each wheel is 14+ lbs heavier than stock? What wheels do you have, and is that weight just the wheel or wheel with the tire on? It seems like a lot of weight but then again I am not all that knowledgeable about the subject.
Iceman, 57 lbs heavier for all four so each wheel is 14+ lbs heavier than stock? What wheels do you have, and is that weight just the wheel or wheel with the tire on? It seems like a lot of weight but then again I am not all that knowledgeable about the subject.
#12
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oops I was off on the weight #'s.......I meant 24lbs.....1lb for each front wheel-tire and 11lbs for each rear wheel-tire..... The stock forged wheels are VERY light...well under 20lbs....
#13
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but then 1mpg is 5% less, and that matches how much further you traveled, so its a wash.
mk
mk
#14
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25 to 28 Lbs is for the copy C2 wheels, and that is very heavy. you right
my kinesis 18s, 9.5" wheels are a very light 19lbs and the rear 11" rims are 20lbs (very light for such a big rim. the tires can range from 25lbs to 30lbs depending on now much steel are in them.)
mk
my kinesis 18s, 9.5" wheels are a very light 19lbs and the rear 11" rims are 20lbs (very light for such a big rim. the tires can range from 25lbs to 30lbs depending on now much steel are in them.)
mk
#15
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actually, im now at 26.2" rear tire diameter. interesting, ive been clocked by radar at exactly 60mph when the indicator reads 60mph. for some reason, maybe safety margin, the stock wheel will indicate faster than you really are.
mk
mk