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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCHTires Very Noisy
Leading reported evidence
Use on one vehicle may be
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In other words a front used on one vehicle may be used as a rear on another application.
Leading evidence: 'Use on one vehicle may be' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace fronts not' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Most guys would suggest you replace the fronts not because of the noise but because they don't match your new rears
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Suggestion
Many cars use different sizes for the front and rear and some even different diameters.
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Suggestion
Hell, if you are using your rear MC brake for much more than holding you at stop on a hill you're not using enough front brake.
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Suggestion
Motorcycles use tires made specifically for steering and braking on the front and power application on the rear.
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I have Bridgestone Potenzas on the front and Michelin Pilots (new) on the rear. Am getting a lot of road noise, but can't tell if it is the front tires only. Before the rear tires were put on, the Porsche mechanic suggested putting better tires on the car since he noticed road noise.
This is the way I purchased the car. Everything else on the car was above average according to the mechanic who did my PPI.
Can you explain why you shouldn't mix tires on a Porsche or any other vehicle?
I will agree left to right, but front to rear should be fine. Many cars use different sizes for the front and rear and some even different diameters. The reason is it enhances performance. In most automotive applications there are very few front or rear specific tires. In other words a front used on one vehicle may be used as a rear on another application.
Motorcycles use tires made specifically for steering and braking on the front and power application on the rear. These tires are made differently, with the overlap on the butt splice directional depending upon rotation, hence the arrow on the sidewall. Softer rubber compound on the front and less tread depth as opposed to the rear, also fronts are usually lighter and slighter lower profile than the rear even if sizing is identical.
When radial motorcycle tires were being introduced they were made in rear application only and would be used with a bias ply front. These were used mainly in roadracing where handling, adheision, and wear were all extreemly important.
In the interest of avoiding litagation, auto and tire manufacturers may state to not mix brands or types of tires. It should be perfectly acceptable to do so if you are using a simular tire in type and speed rating yet different manufacture.
Mixing summer and winter or M+S should be avoided unless you are intentionally doing it for a specific reason and understand the consequences.
Having had motorcycles and sports cars for quite some time, I'd NEVER mix tires. It's a formula for handling imbalance and possibly worse.
The carcass overlap on MC tires could be a reason for the unidirectional arrows but for the fronts it's mostly for braking, as the tread is designed for that force in mind, where the rear is designed mainly for drive. Hell, if you are using your rear MC brake for much more than holding you at stop on a hill you're not using enough front brake.
That said.. when I bought my 993 the PPI very clearly noted the mix of times (like I didn't notice during my phase of inspection) but they did note that the tires were mixed. I had the dealer call around and find me a pair of the same tires locally before I picked it up. ON my F150, sure.. mix tires.. who cares.. the damn thing does not accelarte or brake, but on my Pcars or motorcycles.. I can't see it mixing tires HELPING anything. The only time I mix MC tires is within a manufacture's line of tires, and selecting the softer compound for the front. (e.g. Diablo Corsa rear, Diablo SuperCorsa front - summer only).
This statement is very true but, I had Potenzas on for a short time, maybe a couple thousnad miles and then I bought new rims and put Contis on, they were very noisy.
So, in essense they were both new.
I went ahead and ordered the two front tires from Tire Rack so I will have a matching set of Michelins. Am anxious to see how the car will drive. Cost was $418. including shipping. Thanks for everybodys advice.
you wouldnt think you would notice a diffrence but porsches are very sensitve to diffrent brands/sizes amounts of wear, and n ratings. If you drive a car with mixed tires and then drive one with matching properly n rated tires you will think you went from a 69 vw to new high performance sports car.
Porsceh does alot of research in tires and the cars are tuned accordingly. I would never recomened anything but Nrated matching tires for anyone who drives their car in even a slightly sporting manner
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