[Stephenwz968]

<img src="/forum/images/smilies/968/cool.gif" class="smilie" alt="" />

Partial Post: Please Login or Register to read the full post.

[saxman]

what is the recommended tire size for the 18x9"s in the back?

Partial Post: Please Login or Register to read the full post.

[flash]

the bridgestone RE-050 255/35-18 will fit nicely back there and the 225/40-18 will fit nicely on the 7.5" front

Partial Post: Please Login or Register to read the full post.

[saxman]

[quote name='flash' post='43913' date='Nov 22 2007, 01:41 PM']the bridgestone RE-050 255/35-18 will fit nicely back there and the 225/40-18 will fit nicely on the 7.5" front[/quote]

front already has some 225/40's on 'em... just the rears need tires





so 255/35 is the magic number



thanks!

Partial Post: Please Login or Register to read the full post.

[flash]

yes



if the tires you have are a decent model for your needs, then it's best to match the rear tires - weird things happen when you have one pair on one end, and something different on the other



if not, then dump them and get a matched set - you'll be happier in the end

Partial Post: Please Login or Register to read the full post.

[saxman]

[quote name='flash' post='43921' date='Nov 23 2007, 08:03 AM']yes



if the tires you have are a decent model for your needs, then it's best to match the rear tires - weird things happen when you have one pair on one end, and something different on the other



if not, then dump them and get a matched set - you'll be happier in the end[/quote]

you know, I've heard this statement made many times, and I can't for the life of me figure out what magical situation occurs that causes weird handling issues. There's a thread over on the 993 forum on rennlist where about half the people seem to think this makes the car an instant recipe for death(of course, the other half of the people think the first half is crazy).





I can understand that it would handle differently than if they were all the same tire, and if I drive the car expecting the handling at the limit to be the same, it could bite me in the ass, but I shouldn't be driving like that on the street, and the handling should be expected to be different than what I'm used to anyway.







Basically, for a track car, where you want things to be consistent at the limit always, I can understand the difference... for a street car, I just don't get what physical thing occurs, especially as long as you're using tires that offer a similar level of grip.





If you know something I don't here, I'd love some more insight.

Partial Post: Please Login or Register to read the full post.

[flash]

different tread patterns make for different responses to things in the road - different sidewall constructions make VERY large differences in bump response



it's a lot like understeer/oversteer - you want to seek a balance



you really want the front and rear responding the same way to the same conditions



a quick way to get the point is to go and either let 10-15 lbs of air out of one end of the car, or bump the other end up 10lbs, and then go drive it - you won't like it, but it will illustrate the point of how the ends want to be the same

Partial Post: Please Login or Register to read the full post.

[saxman]

the car has had mismatched tires on it since I purchased it... never noticed any weird issues...

Partial Post: Please Login or Register to read the full post.

[bob blackwell]

I have not experienced any problem handling from using different tires on either end of the car. Problem handling has been noticed when unmatched tires are used on the same end of the car but different from side to side. Of course the ideal is to use the same brand and style all around. Sometimes it is not practical to do this on a daily driver since the front tires and the rear tires always wear out at different rates. Good luck, Bob Blackwell.

Partial Post: Please Login or Register to read the full post.

[968gene]

Handling issues may be related to the age of the tires as well. The old pair might have more side wall flex due to fatigue, age, heat cycling etc. This could happen even with matched sets that have different ages.

Partial Post: Please Login or Register to read the full post.

[saxman]

well, got them on the car today







didn't get the same tires in the rear as up front... although when the fronts wear down, I'll probably replace them with the same thing that's on the rears

Partial Post: Please Login or Register to read the full post.

[flash]

no offense, but not noticing something is frequently just not knowing any better - all it means to date is that you haven't had the pleasure of having them matched - it is different



i can even tell when the tread is thin on a pair of matched tires - i have that problem now on the denali - the tread is a bit thinner back there, and consequently it rides a bit harsher



again, how much different it is depends on how different the tires are in construction, design, and condition

Partial Post: Please Login or Register to read the full post.

[saxman]

[quote name='flash' post='43979' date='Nov 25 2007, 08:25 AM']no offense, but not noticing something is frequently just not knowing any better - all it means to date is that you haven't had the pleasure of having them matched - it is different



i can even tell when the tread is thin on a pair of matched tires - i have that problem now on the denali - the tread is a bit thinner back there, and consequently it rides a bit harsher



again, how much different it is depends on how different the tires are in construction, design, and condition[/quote]

while it may not be ideal, most of the people talking about running mismatched tires talk about how it's a recipe for death. There's a big difference between subtle differences in handling and the car spontaneously erupting into flames because of mismatched tires.

Partial Post: Please Login or Register to read the full post.

[bob blackwell]

Looks beautiful Saxman! Just confirms what I thought about those wheels on my Midnight Blue 968 - those will be the ones I get next for sure. Good luck, Bob Blackwell.

Partial Post: Please Login or Register to read the full post.

[flash]

lol - yeah, not a recipe for death, at least certainly not on the street



however, even on my "street car" any noticeable difference would bug me enough to run right out and change them



but once again, it's all about how different the tires are

Partial Post: Please Login or Register to read the full post.

[saxman]

just stopped by the gas station to use to check tire pressures and such...



had a few surprises...



tire pressure was set at 44 psi in the rear, 42 psi up front... good job tire guys...





and it seems I bumped a curb a little on the rear passenger side... already marked it up. I feel like an idiot.



Shouldn't be too hard to repair though.

Partial Post: Please Login or Register to read the full post.

[flash]

remember that generally speaking you want to run 35 series a bit higher than 40 series, but only a couple of pounds



also, the sidewall construction plays heavily into the pressure setting - soft sidewall tires should be about 2lbs higher than a stiff sidewall tire



for soft sidewall 35 series, i would start at 38 minimum for street



for stiff sidewall 35 series, i would start at 36 minimum for street



drop a pound or two for 40 series

Partial Post: Please Login or Register to read the full post.