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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Brakes, Suspension, Wheels and Tires > Tires

Tires Tires

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  #1  
Old 02-18-2010, 09:27 PM
tb747 tb747 is offline
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tire rotation

ok so i got new tires for my 06trailblazer (2wd) a while back and everytime ive brought it in to get the tires rotated (after 6000k on the new tires then 10k now 15k) all 3 times the guys at the walmart tire place say they dont need to be rotated cause the fronts suppose to have more tread and simply keep tellin me to just come back at the next oil change.?!? So now the rear tires are almost halfway gone and the front ones are pratically brand new. Shouldnt they be indeed rotated??
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  #2  
Old 02-18-2010, 09:54 PM
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Michblaze02 Michblaze02 is offline
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Quote:
Originally Posted by tb747 View Post
ok so i got new tires for my 06trailblazer (2wd) a while back and everytime ive brought it in to get the tires rotated (after 6000k on the new tires then 10k now 15k) all 3 times the guys at the walmart tire place say they dont need to be rotated cause the fronts suppose to have more tread and simply keep tellin me to just come back at the next oil change.?!? So now the rear tires are almost halfway gone and the front ones are pratically brand new. Shouldnt they be indeed rotated??
Did you just buy two? Either way that really doesn't make sense not to rotate. I rotate as much as possible so they wear evenly, this is why I go to a tire shop. Its all they do, and they get me in and out in less then 5 mins usually when rotating.

The only time Ive heard of not rotating was on a grand prix gxp front wheel drive car, which had a larger tire/rim in front and smaller in the rear. So, basically you just keep replacing the fronts.
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Old 02-19-2010, 01:16 AM
WOOLUF1952 WOOLUF1952 is offline
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Quote:
Originally Posted by tb747 View Post
ok so i got new tires for my 06trailblazer (2wd) a while back and everytime ive brought it in to get the tires rotated (after 6000k on the new tires then 10k now 15k) all 3 times the guys at the walmart tire place say they dont need to be rotated cause the fronts suppose to have more tread and simply keep tellin me to just come back at the next oil change.?!? So now the rear tires are almost halfway gone and the front ones are pratically brand new. Shouldnt they be indeed rotated??

I've always been told to put the best tires in the rear. You can't steer the rear.

If the tires are all the same size, they should be rotated.
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Old 02-19-2010, 12:50 PM
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Better tires go in the rear.

Why? Generally speaking, deeper tread means greater traction, especially in snow and rain. In a turn, when the rear loses traction before the front, the result is oversteer, where the back end tries to switch places with the front (a spin, basically).

In a turn, if the front tires lose traction before the rear, the result is understeer, or plowing, which is generally considered to be "safer".

FWD are more prone to understeer and RWD are more prone to oversteer. Why? Consider traction to be a pie that's eaten by three things: acceleration, deceleration, and steering. As a vehicle moves, it places varying demands on those three things.

If you need maximum acceleration, you drive straight since the tires will break loose if they're turned. The same goes for cornering/turning - if you're taking a hard turn at a high rate of speed, you're asking your tires for 100% steering. If you ask them to accelerate too, they'll lose traction. Anyone who has driven a RWD car with a lot of power is probably familiar with this: power oversteer. Since there's less traction available in the snow and rain, it's much easier to kick the rear end out under those conditions.


(Yes, this is a gross oversimplification of vehicle dynamics.)
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Old 02-19-2010, 02:03 PM
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It's actually a pretty GOOD simplification of vehicle dynamics!

Good job!

We got into this a bit when one of our members complained that his mechanic had swapped out his girlfriend's brand new tires from the front of her front-wheel-drive car to the rear. I stated that this was exactly the CORRECT thing to do. If there is a difference in traction, the best tires should always go on the rear.

I still see people putting winter tires only on the front of front-wheel-drive cars and I shudder for two reasons:
- they are way more likely to lose traction in the rear, spin out on the highway some day and hit me or my wife head on, killing us all; and,
- winter tires should ALWAYS be installed on all four wheels to properly maintain vehicle balance and dynamics.

The other issue with not rotating tires on a four-wheel-drive vehicle is that they wear to slightly different diameters.

We all know the issue if we have two different diameters on the same axle: one tire constantly turns faster than the other, and without a differential, the rear axle would quickly break. With the differential though, it now means the internal cage that is designed to rotate only when going around corners is now constantly rotating, causing undue wear.

Now picture a four-wheel-drive vehicle in 4Hi with two different diameters front and rear. This adds undue wear and a HUGE strain to the driveline parts. (Remember that we don't have a center differential in our vehicles.)

Now in most cases, we only use 4Hi on slippery surfaces, so the surface slip takes away the strain, but it is still adding some undue strain. This is why, if one reads their owner's manual, they would find tire rotations should be done more often on four-wheel-drive vehicles than on two-wheel-drive.
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Old 03-05-2010, 05:52 PM
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Michblaze02 Michblaze02 is offline
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What is the best way to rotate our tires. I was just told that cross rotating isn't the best thing to do, and that they typically rotate front to back. His analogy was if you have a wire brush which only rotates in one direction, then if you were to change the direction, parts of the wires would start to break off. He said that can be somewhat similar to what happens with tires since they have metal wire in them.

I don't know, what do you think.
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Old 03-05-2010, 11:37 PM
BTMinn BTMinn is offline
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Our owners manual recommends a modified cross rotating rear tires straight to the front and the front tires to the opposite rear corners.

A search of on-line tire sellers turns up a recommendation to rotate front to rear only for tires with directional tread.

Something to think about is if you do not rotate the tires they will wear out in pairs which means you do not have to pay for four tire all at once.
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Old 03-06-2010, 10:05 AM
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Quote:
Originally Posted by BTMinn View Post
Our owners manual recommends a modified cross rotating rear tires straight to the front and the front tires to the opposite rear corners.

A search of on-line tire sellers turns up a recommendation to rotate front to rear only for tires with directional tread.

Something to think about is if you do not rotate the tires they will wear out in pairs which means you do not have to pay for four tire all at once.
I rotate as much as I can so they last as long as possible. I didnt rotate once and only got 30k out of a 50k tire .

How do you know what tires have "directional tread".
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Old 03-06-2010, 03:07 PM
BTMinn BTMinn is offline
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Directional Tires, also titled as unidirectional, have one of two sidewall markings. A direction of rotation arrow or a label saying "This Side Out".

The tire tread has a V tread design with a definite direction.

Link to a Tire Rack web page showing the Goodyear Eagle F1 GS-D3 and Bridgestone Potenza 960AS PP directional tire treads.

http://blog.tirerack.com/blog/tire/0...ip-john-hughes
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Old 03-06-2010, 03:20 PM
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Quote:
Originally Posted by BTMinn View Post
... a label saying "This Side Out".
actually thats for assymetricl tires. Those can only be mounted on the rim one way no matter what side of the car they are one.

A directional tire will illustrate direction of rotation or the sidewalls will say "Left" and "Right" on each side of the tire. Left side faces out to go on the driver side and right faces up to go on the passenager side.

Unless specifically otherwise by my customers we rotate front to rear. AWD being the exception. When buying tires from Sears you get free rotate and balance so they take advantage of it and do it religiously.
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