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A Simple Formula for OD of tires UPSIZING FORMULA

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 Post subject: A Simple Formula for OD of tires UPSIZING FORMULA
PostPosted: Fri Dec 17, 2010 11:59 am 
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I sprinkle rubber on my Cherios
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Joined: Mon Oct 25, 2010 11:09 am
Posts: 319
Location: Belmont Shore
My Audis (A4Q and V8Q) Both have aftermarket wheels and tires, and I have been in the tire industry for years, so I wanted to pass this information on to you all. I haven't gone through the thread that far back, so I hope this post isn't an exhibition of redundancy.

V8Q tire size:
215/60-15 215(section width) x .6(aspect ratio) / 25.4(mm to inches) x 2(sidewalls) + 15 (wheel diameter) = 25.15 OD

UPSIZE TO 17"
235 X .45 / 25.4 X 2 + 17= 25.32

UPSIZE TO 18"

235 X .40 / 25.4 X 2 + 18= 25.4

Hope this helps

_________________
90 V8Q 3.6L MAGNAFLOW, H&R, KYB, GIRLING CONVERSION, FALKEN
01 A6 4.2L SPORT. STOCK. FOR NOW.
88 90Q 2.3 10V BONE FKN STOCK. *SOLD GOING TO ALBUQUERQUE
69 MERCURY COUGAR ELIMINATOR 351 SOLD TO MOM. *TRADED FOR CAR BELOW +CASH LOL
00 A6Q 2.8 30v AVANT RUNNING FANTASTICALLY *TRADED FOR CAR ABOVE
99 A4TQ 1.8T EVOMS GIAC, MAGNAFLOW,SAMCO, EIBACH, AXIS, TOYO *SOLD
08 CAD CTS *SOLD.


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 Post subject: Re: A Simple Formula for OD of tires UPSIZING FORMULA
PostPosted: Fri Dec 17, 2010 12:16 pm 
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I sprinkle rubber on my Cherios

Joined: Thu Dec 31, 2009 11:42 pm
Posts: 202
Location: Junction City, KS
http://www.miata.net/garage/tirecalc.html

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VW SLC TDI

Audi 200 20vtq


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