Discussion:
Why new tires don't look as the original tires on my IS350?
(too old to reply)
Visa Inquirer
2008-09-20 05:53:32 UTC
Permalink
I changed 2 front tires on my IS350.
Bridgestone 225/40R18 88Y changed for Michelin 225/50ZR18 88Y

Same type but they look different. The original tire was kinda
thinning towards the outer edge of the wheel.
The new one is like all other ones.

Why tire shapes are so different?
Ray O
2008-09-20 06:03:16 UTC
Permalink
Post by Visa Inquirer
I changed 2 front tires on my IS350.
Bridgestone 225/40R18 88Y changed for Michelin 225/50ZR18 88Y
Same type but they look different. The original tire was kinda
thinning towards the outer edge of the wheel.
The new one is like all other ones.
Why tire shapes are so different?
The Bridgestone tires are a different size (lower profile) than the
Michelins, which have a slightly taller sidewall. Tread patterns differ
from manufacturer to manufacturer.
--
Ray O
(correct punctuation to reply)
Jay Somerset
2008-09-21 23:25:13 UTC
Permalink
On Fri, 19 Sep 2008 22:53:32 -0700 (PDT), Visa Inquirer
Post by Visa Inquirer
I changed 2 front tires on my IS350.
Bridgestone 225/40R18 88Y changed for Michelin 225/50ZR18 88Y
Same type but they look different. The original tire was kinda
thinning towards the outer edge of the wheel.
The new one is like all other ones.
Why tire shapes are so different?
Why would you put a different size tire on the front? The Michelins
are NOT the same size as your old Bridgestones -- 50R18 instead of
40R18. Good thing you don't have all wheel drive, or you would be in
a bit of trouble.

Also, your speedometer/odometer readings will also be off by a
considerable amount with this change. If you change the
width/diameter ration, you have to also change the diameter to keep
the same tire circumpherence.

Unless your 50R18 is just a typo. :-)
--
Jay (remove dashes for legal email address)
Jay Somerset
2008-09-23 02:27:03 UTC
Permalink
On Fri, 19 Sep 2008 22:53:32 -0700 (PDT), Visa Inquirer
Post by Visa Inquirer
I changed 2 front tires on my IS350.
Bridgestone 225/40R18 88Y changed for Michelin 225/50ZR18 88Y
Same type but they look different. The original tire was kinda
thinning towards the outer edge of the wheel.
The new one is like all other ones.
Why tire shapes are so different?
Why would you put a different size tire on the front? The Michelins
are NOT the same size as your old Bridgestones -- 50R18 instead of
40R18. Good thing you don't have all wheel drive, or you would be in
a bit of trouble.

Also, your speedometer/odometer readings will also be off by a
considerable amount with this change. If you change the
width/diameter ration, you have to also change the diameter to keep
the same tire circumpherence.

Unless your 50R18 is just a typo. :-)
--
Jay (remove dashes for legal email address)
j***@hotmail.com
2008-09-27 18:01:02 UTC
Permalink
First of all, Michelins are much better tires than the Bridgestones
you replaced. Like others said, these are taller profile (50) tires
than the typical 40 you replaced.

According to the Michelin website, the "standard" is the 225/40R18
(88Y front / 95Y rear). Your specific model year may allow the 225/50
if the manual says so; otherwise you have the wrong tires on there.
I'd use only the specified geometry but others may differ.

Who put those tires on there?

http://www.michelinman.com/action/tires/find-by-vehicle/?make=Lexus&model=IS350&year=2007&option=RWD+18+Inch+Tire+Option
Post by Visa Inquirer
I changed 2 front tires on my IS350.
Bridgestone 225/40R18 88Y changed for Michelin 225/50ZR18 88Y
Same type but they look different. The original tire was kinda
thinning towards the outer edge of the wheel.
The new one is like all other ones.
Why tire shapes are so different?
Loading...