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wheel size questions
#55328 August 30th 2004 3:42 pm
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hey guys... im just wondering, would i get away with 20's on my 75 g-20? or would i have to a few wheel-well mods? also... how badly would this affect the speedometer? how can i adjust the speedometer so that the speed shown is somewhat accurate?
thanks!

Re: wheel size questions
#55329 August 30th 2004 4:43 pm
Joined: Nov 2001
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pooh-bah
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The wheel wells on the older vans aren't quite as wide as the new ones. Take out a tape measure and see how wide your's is, and plan accordingly.

You can keep your speedo accurate by buying tires that are the same diameter as the ones on your van now, only the rim diameter would change.

Re: wheel size questions
#55330 August 30th 2004 4:52 pm
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pooh-bah
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I used to have a link to an upsize chart, gave people rim and tire aspect ratio's if they wanted to go larger.
235/70 R15
245/60 R16
255/50 R17

Re: wheel size questions
#55331 August 31st 2004 12:44 am
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Here's a neat little calculator that will help you find out potential discrpencies in your speedo.

http://www.miata.net/garage/tirecalc.html

Re: wheel size questions
#55332 August 31st 2004 1:56 am
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i knew about matching tire diameter... but 20's? thats gonna be nothing for tires... and plus, dont you need some kind of tires for the weight of a van?
lets say.. IF the tire was bigger in the end how would i correct my speedometer?

Re: wheel size questions
#55333 August 31st 2004 5:39 am
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pooh-bah
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You go to the dealership, tell them your combo (engine, trans, rear end, and tire diameter), and they sell you a new gear for your speedo cable.

As far as tha matching, my dad matched his 20s to the stock diameter, I'll have to check, but I think his are like 275-50-20s


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