What constitutes "normal" tire wear? - Maserati Forum
 
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post #1 of 6 Old 05-19-2017, 05:34 PM Thread Starter
 
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What constitutes "normal" tire wear?

Hey guys, I have a 2008 QP Sport GT auto and I just had to replace my rear tires after about 10,000 miles. The fronts have the same amount of miles but didn't need replacing.

The fronts still have about 65 or 70% of the tread left, but each rear tire had about 45% tread remaining on the outside half and about 5% left on the inside half.

I do NOT spin the tires, so it's not abuse that's resulted in the strange wear pattern. Is this normal on the QP? Perhaps a result of some very aggressive camber settings that Maserati uses? Or is this a sign that the car needs a rear alignment?

Thanks! Tom in NH


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Tom - New Hampshire
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post #2 of 6 Old 05-19-2017, 06:58 PM
 
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Originally Posted by Dabo View Post
Hey guys, I have a 2008 QP Sport GT auto and I just had to replace my rear tires after about 10,000 miles. The fronts have the same amount of miles but didn't need replacing.

The fronts still have about 65 or 70% of the tread left, but each rear tire had about 45% tread remaining on the outside half and about 5% left on the inside half.

I do NOT spin the tires, so it's not abuse that's resulted in the strange wear pattern. Is this normal on the QP? Perhaps a result of some very aggressive camber settings that Maserati uses? Or is this a sign that the car needs a rear alignment?

Thanks! Tom in NH


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If you were able to get 10K on your rear tires, then you're doing well.

I also would say that the uneven wear pattern is typical of the QP in it's recommended setup. There are ways of adjusting the camber/tow to lessen the effect but I would stick with your current setup if you are getting that kind of mileage and your are happy with the handling.

Your front tires will get far more mileage. That, also, is normal. All of my friends with these cars state "my fronts never wear out!" I have experienced the same.

My rear tires get about 5,000 miles until replacement is necessary and my fronts about 12k-15k. I drive mine aggressively so this wear rate is expected.

Some points to keep in mind:

1. High performance tires typcally have a treadwear rating of 220-300. Goodyear makes a 285 35 R 19 that has a treadwear rating of 500! Definitely a help on the QP.

2. If you decide to get an alignment, be sure to have the work done PRIOR TO LIFTING THE CAR FROM THE FRAME. In other words, if you get new tires installed then drive directly over to the hunter rack for an alignment, your alignment parameters will not stick and you will quickly burn through your new set. This is because your car takes a few days/100 miles or so to settle to its typical ride height. During that time, your alignment will slowly drift out of spec slightly, often enough to affect tire wear.

So, if you get the alignment work, be sure to DO IT FIRST, then get the tires installed. This is a good rule of thumb for any car but I have seen the effects especially on the Porsches and Maseratis I have owned.

Erik Di Somma
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post #3 of 6 Old 05-19-2017, 08:44 PM Thread Starter
 
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Great information Eric! Thanks for chiming in. The car handles beautifully as-is, so I'll just keep things the way they are now. Good to know this is normal and there's nothing out-of-whack with my QP. Take care!


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Tom - New Hampshire
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post #4 of 6 Old 05-20-2017, 12:00 AM

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Erik's notes on the suspension loads prior to alignment are an important step in achieving an accurate and stable set of alignment specs. In addition, suspension loads DURING alignment is also a factor, as is the SEQUENTIAL ORDER in which alignment parameters are adjusted. Dealers and top-tier independents know this, but even great tire shops and alignment specialists may not.

Attachments show (a) the factory process; and (b) values from my latest alignment (2009 Base QP5), as an example of what can be achieved. Mine was done at a capable independent. Then I took it to a dealer for some other work and while there, had them check the alignment specs on their equipment. There wasn't enough difference in the readings to warrant any adjustments. This gave me enough confidence to keep using the independent going forward for alignment work. Be aware, though that there can be machine-to-machine variations, so sticking with the same equipment is a useful strategy if you want to change settings from nominal to something else for a specific purpose.

I haven't run through a set of tires yet, but my sense is that full attention to alignment specs and approved processes can lead to even wear on both axles. That doesn't necessarily mean that fronts and rears will reach the wear bars at the same time: the rears are the drive wheels, delivering lots of torque to the ground most of the time. If reality eventually refutes my impression, I will retract.

KTBD
Attached Files
File Type: pdf QP5 Alignment Specs.pdf (321.9 KB, 13 views)
File Type: pdf QP5 (My) Align Specs.pdf (341.7 KB, 13 views)

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post #5 of 6 Old 05-20-2017, 03:32 AM
 
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I must have missed something in the wheel alignment class..It was never that complicated...You guys make it sound like landing on the moon....It is not a race car and the car has rubber bushings all over....It is not that difficult with a modern alignment machine..Jason

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post #6 of 6 Old 05-20-2017, 05:30 AM

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Originally Posted by Jason@ Enzo`s Atlanta View Post
I must have missed something in the wheel alignment class..It was never that complicated...You guys make it sound like landing on the moon....It is not a race car and the car has rubber bushings all over....It is not that difficult with a modern alignment machine..Jason
LOL Jason, the moon landing was *faked* remember? NASA was actually preoccupied with doing a 4-wheel alignment on a Maserati...

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