Pirelli Rosso's out-of-round?
07-29-2008, 01:23 PM
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Pirelli Rosso's out-of-round?
Last week I installed a set of Pirelli Rosso N5 (235 and 295) on my 2004 GT3.
Over the weekend I had some empty roads: above 130mph and up to top-speed the car starts to shiver
No problems below 130mph.
Today I went to the tire dealer where we took the two rear wheels off and onto the balancing machine again. Both are significantly out-of-round, easily visible. The rim is fine, the tire is centred, but the cap of tire moves.
I am quite sure this wasn't the case when they were installed a few days earlier...
Does anyone have similar experiences with the Pirellis? With the Michelin's I didn't have any problem.
Regards
Wolfgang
Over the weekend I had some empty roads: above 130mph and up to top-speed the car starts to shiver
No problems below 130mph.Today I went to the tire dealer where we took the two rear wheels off and onto the balancing machine again. Both are significantly out-of-round, easily visible. The rim is fine, the tire is centred, but the cap of tire moves.
I am quite sure this wasn't the case when they were installed a few days earlier...
Does anyone have similar experiences with the Pirellis? With the Michelin's I didn't have any problem.
Regards
Wolfgang
07-29-2008, 02:47 PM
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I have had several sets of N5's without out-of-round issues. However, with tracking, the tires chunked badly and the Rosso label bubbled out on the sidewall.
If all is well below 130 mph, can you not road-force balance the rears to take of the issue?
If all is well below 130 mph, can you not road-force balance the rears to take of the issue?
07-29-2008, 05:14 PM
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Hmm, what is 'road-force balancing'? (sorry, I'm not a native speaker and couldn't find it in a dictionary 
)
Is this the fine-balancing with the wheels mounted on the hub?
The wheels were balanced the 'usual' way with only very small weights needed.
Wolfgang
)Is this the fine-balancing with the wheels mounted on the hub?
The wheels were balanced the 'usual' way with only very small weights needed.
Wolfgang
07-29-2008, 06:29 PM
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Wolfgang, I have also had defective P0 Rosso with the same symptoms. They were replaced. Apparently the internal belts slipped causing an out of round condition.
Best,
Best,
07-29-2008, 07:55 PM
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You can read more about road-force balancing here:
http://www.tirerack.com/tires/tirete....jsp?techid=40
The Hunter GSP9700 is a road-force balancing machine.
Some debate the merits of road-force balancing. In short, it uses a roller against the tire and can help 'line up' the high point on a tire with the low point on the rim thus compensating for out-of-round conditions within a certain spec.
However, if your tires were fine to begin with then I'd be concerned especially with reports like the one from Bob RE slipped belts.
