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Tire Rack's Tires, Wheels, Brakes & Suspension
Discuss everything about wheels, tires, suspension and brakes for your BMW.

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  #1  
Old 07-01-2003, 08:04 AM
KU Ned's Avatar
KU Ned KU Ned is offline
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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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  #2  
Old 07-01-2003, 08:06 AM
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Nick325xiT 5spd Nick325xiT 5spd is offline
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Mein Auto: M3 & 323i/999 KP
Yes.

R tires, and tires like Azenis Sports and S-03s tend to run wide for their putative sizes.
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  #3  
Old 07-01-2003, 08:08 AM
AF AF is offline
Here since day one
Location: Long Island, NY
 
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Posts: 7,072
Mein Auto: 535ix, GL450, 991S
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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  #4  
Old 07-01-2003, 08:11 AM
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Gary@Tirerack Gary@Tirerack is offline
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Location: South Bend, IN
 
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Mein Auto: 1995 BMW M3
Yes. 1inch =about 25mm
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Old 07-01-2003, 07:51 PM
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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.

s03
http://www.tirerack.com/tires/Spec.j...+Pole+Position

re750
http://www.tirerack.com/tires/Spec.j...=Potenza+RE750

pilot sport
http://www.tirerack.com/tires/Spec.j...el=Pilot+Sport
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