Re: Tires - inside outside directional - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Tires - inside outside directional
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Posted by Snowmobile [Email] (#686) [Profile/Gallery] (more from Snowmobile) on Fri, 8 Mar 2019 19:03:13 Share Post by Email
In Reply to: Tires - inside outside directional, GFW3pedals [Profile/Gallery] , Fri, 8 Mar 2019 08:45:37
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Modern tires can be symmetric or asymmetric and directional or non-directional.

I prefer directional symmetric tires because they are usually fairly good at expelling water (or snow). They can be flipped over the rim if you get uneven wear inside to outside, but they do have to always rotate the right way... so tire rotation (not flipping over the rim) is same side, front to back to front... Here is an example:



Most ultra high performance tires now have tread blocks optimized for inside or outside of the tire and so can not be flipped over the rim. they are asymmetric. However, almost all asymetric tires are not directional. If they were, you would need to buy left and right tires. The catch is, many asymmetric tires *look* like they should be directional... but they apparently are not. Imho they look really bizarre rolling "backwards" but that is what is intended. Here is an example:



I personally like the look of asymetrics that don't look so "directional", ie few slanted channels. I had Pilot Super Sports at one point. Nice tires (but wear fast, as one would expect):



With any of these, you can rotate them back to front to back or rotate them diagonally across the car (probably better in terms of wear?).

Then there are symmetric nondirectionals which are really popular as typical general purpose all season tires. They can be rotated any way (diagonal, front to back, etc) and they can be flipped over the rim because the tread is rotationally symmetric. They are the most versatile, but usually more comfort/ fuel economy/ long lasting oriented rather than ultimate performance... I've never really had a pair I liked, but my biases are towards wet weather performance (and performance over comfort, noise, fuel economy, longevity etc)...



Not sure which generals you have. I have a couple sets of AS-03's and they are directional. The Altimax RT43 (above) is symmetric non-directional, though it's predecessor was directional. The AS-05 from general (replaces the AS-03) is now asymmetric non-directional. I think in general, at the bleeding edge of dry road performance, you want different tread blocks inside vs outside the tire, so that is currently the trend for those types of tires.
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