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Tire Rack's Tires, Wheels, Brakes & Suspension
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Old 07-01-2003, 08:04 AM
KU Ned's Avatar
KU Ned KU Ned is offline
Location: Kansas City
Join Date: Apr 2003
Posts: 521
Mein Auto: 330i ZHP
Tire sizes

I just purchased two 235/40 Kuhmo Ecsta V700's to use on the track and auto X. I already have three slightly used 225/45's that I am going to put on the front. I mounted the tires on 17X8 wheels.

Last night I put on the new rear tires (235/40). They are only about 1/2 inch (or less) narrower than the stock 255/35-18's that came on the car. Do the different tire manufacturers have different measurements?

I will post pictures later today or tommorow of the two different tires lying flat next to each other.
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Old 07-01-2003, 08:06 AM
Nick325xiT 5spd's Avatar
Nick325xiT 5spd Nick325xiT 5spd is offline
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Location: Bethesda, MD
Join Date: Dec 2001
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Mein Auto: M3 & 323i/999 KP

R tires, and tires like Azenis Sports and S-03s tend to run wide for their putative sizes.
2006 GMC Sierra 2500HD 4WD Duramax LBZ/Allison 6-speed
2002 BMW M3 Alpinweiß/Black
1999 323i KP/GTS2 Alpinweiß
1990 325is Brilliantrot/Tan
1989 325is S50B30US Alpinweiß/Black
1989 M3 Alpinweiß/Black S50B32 (321hp, ITBs)

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Old 07-01-2003, 08:08 AM
AF AF is offline
Here since day one
Location: Long Island, NY
Join Date: Dec 2001
Posts: 7,087
Mein Auto: 550ix, GL450, 991S, R8
Yes, all tires have different size footprints . . . but 1/2" difference is very close to what it should be . . isn't 20mm difference about 3/4 of an inch roughly !?

A good example is looking at a Bridgestone SO3 . . . that tire has a very big footprint . . .
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Old 07-01-2003, 08:11 AM
Gary@Tirerack's Avatar
Gary@Tirerack Gary@Tirerack is offline
Location: South Bend, IN
Join Date: Jun 2003
Posts: 4,286
Mein Auto: 1995 BMW M3
Yes. 1inch =about 25mm
Refer to 'Gary/Bimmerfest' as your previous contact when you order online. Credit Bimmerfest.com by ordering through the sig link.

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Old 07-01-2003, 07:51 PM
Ashe too's Avatar
Ashe too Ashe too is offline
Common Sense, isn't
Location: Charlotte NC
Join Date: Dec 2001
Posts: 214
Mein Auto: '04 330i ZHP
actual tire sizes vary slightly from one manufacturer to another. in fact, even different tires by the same manufacturer are slightly different. for example, in a size in 225/45/17, the potenza s03 is 9" section width and a potenza re750 is 8.9" section width and a michelin pilot sport is 8.8" section width. Tread widths vary differently too as some tires are more square shouldered than others. check out the specs for each tire on the tire rack website or on the manufacturers website.



pilot sport

2004 330i | zhp | 6-speed manual
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