: Directional tires



usslasalle
06-26-13, 12:26 PM
I have an 2011 CTS AWD and is it true that you cant rotate this tires being the straight factory tires that came with car and they're directional tires.

tinman
06-26-13, 01:40 PM
Not sure what tires you have, but if they are directional they should have an arrow showing the rotation. If they are directional they can only go from the front to the rear and vice-versa, no X pattern like the old days.

jghiller
06-26-13, 03:31 PM
Dont know of any CTS's with directional Michelins. If you have a coupe of course you can only rotate from side to side.

tinman
06-26-13, 03:37 PM
Dont know of any CTS's with directional Michelins. If you have a coupe of course you can only rotate from side to side.

Side to side? Or front to back? If they are directional then it is only front to back/back to front, never side to side. If they are not directional then any which way but loose!

gohawks63
06-26-13, 08:49 PM
Side to side? Or front to back? If they are directional then it is only front to back/back to front, never side to side. If they are not directional then any which way but loose!

The coupe has staggered tires. Rear wheels wider than the front.

So for the coupe if you don't have directional tires (like the OEM Michelins) you can only go side to side. If you replaced them with directional tires you can't rotate them at all.

usslasalle
06-26-13, 10:14 PM
I have the 0EM mich tires that came with it..back is wider then the front..so that being said you can't rotate them

00 ss
06-27-13, 12:02 AM
You can if you have them dismounted, flipped over and switch sides. I'm not recommending this, just saying it's possible.

Oz Sr
06-28-13, 04:25 PM
My 2013 Coupe came with:
Michelin-Pilor HX MXM4 Directional Tires size -P235/50R18" on the front & P265/45R18" on the rear... no rotating here.

RAB
06-28-13, 05:10 PM
My 2013 Coupe came with:
Michelin-Pilor HX MXM4 Directional Tires size -P235/50R18" on the front & P265/45R18" on the rear... no rotating here.

Oz Sr, that's interesting. On your '13 Coupe you have a different/specific Michelin part number tire at every wheel. Are replacement tires for your car more pricey than the regular bi-directional tires (size for size)?

C "T" ess
06-29-13, 09:56 AM
RAB, I'm not sure what you are referring to when you say that each tire on a 2013 coupe has a different/specific part number. They may have different identifiers as required by Fed Law which relates the tire to each particular car (due to massive tire recalls in recent years) but a tire is a tire.

RAB
06-29-13, 06:23 PM
C "T" ess, I get what you're saying about different identifiers on tires... but what I was getting at related to what Oz Sr stated his 2013 Coupe came with, that being Michelin-Pilot HX MXM4 directional Tires, size P235/50R18" on the front and size P265/45R18" on the rear, where none of his tires can be rotated. This essentially means:

-The front left directional P235/50R18 tire, designed to turn counter-clockwise when the car is going forward, designates a given Michelin model type & part number.
-The front right directional P235/50R18 tire, designed to turn clockwise when the car is going forward, designates a different Michelin model type & part number.
-The rear left directional P265/45R18 tire, designed to turn counter-clockwise when the car is going forward, designates a different Michelin model type & part number.
-The rear right directional P265/45R18 tire, designed to turn clockwise when the car is going forward, designates a different Michelin model type & part number.

When I need to buy new 19" all-season non-directional OE tires for my '11 CTS4 Sedan I'll be buying 4 identical tires, likely at preferred pricing for purchasing 4 of them. When Oz Sr and others buy new tires for their cars they will need to buy 4 different model type/part number directional tires. I was thinking there could be a price penalty for single tire purchases of specific size/model directional tires, where each of the 4 tires being different from the other. I guess another concern I'd have is any-day nationwide availability of a given size directional tire, and that in itself could cause the price to be higher.

dreiloft
06-29-13, 08:02 PM
RAB:

I think you are incorrect. You just flip the tire when mounting the tire on the rim, so the direction coincides when mounting on the left or the right side of the vehicle. He would only need two different sets of tires, a set for the front an another for the rear.

arw1510
06-29-13, 08:16 PM
RAB:

I think you are incorrect. You just flip the tire when mounting the tire on the rim, so the direction coincides when mounting on the left or the right side of the vehicle. He would only need two different sets of tires, a set for the front an another for the rear.

I don't think so. Say your left tire has tread pattern ABCDE with the arrow pointing forward. If you flip the tire when mounted, wouldn't the arrow point the other way, and the tread pattern now be EDCBA? If the tread pattern was symmetrical say ABCBA, then you could buy pairs

Does that sound right? It's tough to visualize, I just did it with a water bottle top and put an arrow and simulated tread pattern and didn't get it to match up by just flipping it

al williams
06-29-13, 08:18 PM
I can't find any indication that the Michelin-Pilot HX MXM4 is directional, even on the Michelin web site. There are many statements that they are NOT directional. Directional tires have two triangles on the sidewall pointing in the direction that the tire is to rotate. If there are no triangles, the tire is not directional. There are many assymetrical tires (the two sides of the tread are different) that are marked which side should of the tire should be out when mounted. Those are not directional unless they also have arrows marking the direction of rotation.

dreiloft
06-29-13, 08:53 PM
I don't think so. Say your left tire has tread pattern ABCDE with the arrow pointing forward. If you flip the tire when mounted, wouldn't the arrow point the other way, and the tread pattern now be EDCBA? If the tread pattern was symmetrical say ABCBA, then you could buy pairs

Does that sound right? It's tough to visualize, I just did it with a water bottle top and put an arrow and simulated tread pattern and didn't get it to match up by just flipping it

I googled this after I posted my last post.

A directional (also called a unidirectional) tread pattern is designed to roll in only one direction. It features lateral grooves on both sides of the tire’s centerline that point in the same direction and result in v-shaped tread blocks. These grooves increase hydroplaning resistance at high speeds by pumping water more efficiently through the tread pattern. Unless they're dismounted and remounted on their wheels to accommodate use on the other side of the vehicle, directional tires are to be installed

ctspremium
06-29-13, 08:57 PM
RAB:

I think you are incorrect. You just flip the tire when mounting the tire on the rim, so the direction coincides when mounting on the left or the right side of the vehicle. He would only need two different sets of tires, a set for the front an another for the rear.

Dreiloft, Of course you are quite correct. I own a 2013 CTS coupe and because of a problem on the road I had to replace the two rear tires. My DIC informed me of a loss in psi for the RR tire. Long story short: The tire picked up a 3" wood screw, we applied air & sealant, but I knew I had to change the two rear tires because I had over 10K on the car and you just do not drive with uneven tires on the same position. I replaced the two rear tires and although they cost over $320.00 per tire, they are worth it.

Relating to your reply, One DOES NOT ROTATE TIRES ON THIS TYPE OF VEHICLE.

Front tires are: 245/45ZR 19
Rear tires are: 275/40R. 19 101V
Tire Pressure: 35 psi for all each.

dreiloft
06-29-13, 09:19 PM
Dreiloft, Of course you are quite correct. I own a 2013 CTS coupe and because of a problem on the road I had to replace the two rear tires. My DIC informed me of a loss in psi for the RR tire. Long story short: The tire picked up a 3" wood screw, we applied air & sealant, but I knew I had to change the two rear tires because I had over 10K on the car and you just do not drive with uneven tires on the same position. I replaced the two rear tires and although they cost over $320.00 per tire, they are worth it.

Relating to your reply, One DOES NOT ROTATE TIRES ON THIS TYPE OF VEHICLE.

Front tires are: 245/45ZR 19
Rear tires are: 275/40R. 19 101V
Tire Pressure: 35 psi for all each.

I have the 19" summer tire package on my 2012 coupe which are non directional and when I took it in for service they just rotated left to right.

RAB
06-29-13, 10:26 PM
RAB:
I think you are incorrect. You just flip the tire when mounting the tire on the rim, so the direction coincides when mounting on the left or the right side of the vehicle. He would only need two different sets of tires, a set for the front an another for the rear.
Doh!!:duh: What was I thinking?! Yes, of course, with blackwall tires you just flip the tire over on the rim and you're good to go. For some reason I was thinking a uni-directional tire could be mounted on the rim in one orientation only.. a thought pattern left over in my head from the days of whitewall and raised white letter tires. :nono: