Tire Wear
Thread Starter
5th Gear
Joined: Oct 2006
Posts: 5
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From: bowleys quarters maryland
Tire Wear
Good morning.
I have a 99 C5 and am about to put the second set of tires on it. Ive order the Kumho Run Flats. I have two questions maybe someone can help me with. First, I dont seem to get any better that 20 to 25K out of a set of run flats, is that normal. Second, my passengers side rear tire is almost bald while the other rear tire has considerable tread left on it and both fronts have a really good amount of tread left. Im curious as to why the passenger rear only wore out so bad. Another question, can I leave the fronts on which have a lot of tread left and mix them (Firestone Firehawks) with new Kumhos on the back.
Thanks
Bluslvr in Bowleys Quarters
Bluslvr@comcast.net
I have a 99 C5 and am about to put the second set of tires on it. Ive order the Kumho Run Flats. I have two questions maybe someone can help me with. First, I dont seem to get any better that 20 to 25K out of a set of run flats, is that normal. Second, my passengers side rear tire is almost bald while the other rear tire has considerable tread left on it and both fronts have a really good amount of tread left. Im curious as to why the passenger rear only wore out so bad. Another question, can I leave the fronts on which have a lot of tread left and mix them (Firestone Firehawks) with new Kumhos on the back.
Thanks
Bluslvr in Bowleys Quarters
Bluslvr@comcast.net
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
I and many others consistently get 40K plus ( in my case K ) out of a set of Good year run flats.. tire pressure and alignment are the biggest factors..
Many here subscribe to 30 psi cold... which is ok... but 30 psi HOT is much much better. In climates that see 30 degree from cold to hot in 24 hots.. setting tire pressure cold...leads to + 4 or 5 psi when hot.. tires at 35 psi will wear prematurely, cause a center high condition, reduce lateral foot print. 45,000 miles can be done... and still have fun with the car... I had 4/32 left on the fronts and 3/32 left on the rears when I hit 43,000 miles. Tire wear was even.
Kumo's will not wear as well as the Firestone's.
People may tell you you can do it, even the tire store... they will say anything to make a sale... many people just think it is OK because they are the same type of tire... many people have mixed tires all their life and think run flats are like regular tires. Be careful who you listen to here..many will encourage you to do what they have done...it doesn't make it right or safe. It just gives them peace of mind to encourage other to do what they have done. Be it right or wrong.
Run flat technology varies greatly from one manufacturer to another... the side wall design is very different... I would Not mix two different manufacturer's run flats, handling will suffer, and safety could be an issue when in a panic condition ( like swerving to avoid a deer ) active handling will not correct for different side wall deflection..
Hope this helps
Bill aka ET
There is no problem with a non run flat tire mix... But Run flats have very focused sidewall design... and they are not the same...
Many here subscribe to 30 psi cold... which is ok... but 30 psi HOT is much much better. In climates that see 30 degree from cold to hot in 24 hots.. setting tire pressure cold...leads to + 4 or 5 psi when hot.. tires at 35 psi will wear prematurely, cause a center high condition, reduce lateral foot print. 45,000 miles can be done... and still have fun with the car... I had 4/32 left on the fronts and 3/32 left on the rears when I hit 43,000 miles. Tire wear was even.
Kumo's will not wear as well as the Firestone's.
People may tell you you can do it, even the tire store... they will say anything to make a sale... many people just think it is OK because they are the same type of tire... many people have mixed tires all their life and think run flats are like regular tires. Be careful who you listen to here..many will encourage you to do what they have done...it doesn't make it right or safe. It just gives them peace of mind to encourage other to do what they have done. Be it right or wrong.
Run flat technology varies greatly from one manufacturer to another... the side wall design is very different... I would Not mix two different manufacturer's run flats, handling will suffer, and safety could be an issue when in a panic condition ( like swerving to avoid a deer ) active handling will not correct for different side wall deflection..
Hope this helps
Bill aka ET
There is no problem with a non run flat tire mix... But Run flats have very focused sidewall design... and they are not the same...
Last edited by Evil-Twin; Oct 30, 2006 at 05:17 PM.
Melting Slicks
Joined: Jul 2006
Posts: 2,332
Likes: 31
From: Silver Spring MD
run flats
Michelin says run the ZP Pilot Sports at 5# of pressure ABOVE the recommended pressure and check treadwear once a month across the entire tread. Don't know why they want more air but they do.
BIGHANK
BIGHANK
Drifting
Joined: May 2005
Posts: 1,566
Likes: 52
From: Colorado Springs CO
Welcome back Bill! Good to hear from you.
I, too, load mine up to about 27psi cold which brings them to 30 psi hot and I have gotten great wear out of my OEM run flats.
I would not mix run flats or any other kind of tire on the car only because the tread pattern varies so much from type to type it would look ridiculous.
Glen
I, too, load mine up to about 27psi cold which brings them to 30 psi hot and I have gotten great wear out of my OEM run flats.
I would not mix run flats or any other kind of tire on the car only because the tread pattern varies so much from type to type it would look ridiculous.
Glen
