PR4-GT

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Jeffsy1
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PR4-GT

Postby Jeffsy1 » Wed Jul 29, 2015 8:28 am

Fitted a pair of PR4GT some 12K back. The bike has developed over the last 1K tramlining when the tyres are cold or hot. Have checked tyre pressures 42R, 36F. Steering head and forks no movement at all, and everything at the rear is all tight with no free play. Everything looks good. Tyres no apparent unusual wear. Previous tyres were PR2 and had no tramlining probs at all.
Any one else noticed this trait?
Wondering if the side walls on the GT are not as flexible.

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Shoey
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Re: PR4-GT

Postby Shoey » Wed Jul 29, 2015 9:00 am

Jeffsy 1 you have answered your own question, the side walls are stiffer on the GT's. I have used them but mainly for towing and they were great 14,000kms.
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Gus
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Re: PR4-GT

Postby Gus » Wed Jul 29, 2015 11:16 am

never had that problem with mine,
I run 42psi front 44 psi rear got 20k out of the last set.
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Bernie
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Re: PR4-GT

Postby Bernie » Wed Jul 29, 2015 3:49 pm

Tramlining is caused by the BACK tyre when it has a wide flat strip worn into the center. This also causes heavy steering, the bike has to be forced to lean into corners. All brands of tyres will cause these problems when they have the flat strip worn into them. Your back tyre is finished, buy a new one. :whistle:

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Steve
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Re: PR4-GT

Postby Steve » Wed Jul 29, 2015 4:33 pm

Bernie wrote:Tramlining is caused by the BACK tyre when it has a wide flat strip worn into the center. This also causes heavy steering, the bike has to be forced to lean into corners. All brands of tyres will cause these problems when they have the flat strip worn into them. Your back tyre is finished, buy a new one. :whistle:

Amen. Mine was like that on the Assault this year. Totally different bike with fresh rubber.
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Jeffsy1
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Re: PR4-GT

Postby Jeffsy1 » Wed Jul 29, 2015 5:16 pm

The back tyre has no unusual wear, or middle flat spot. The PR2 developed a flat spot, however it did not tramline to this extent.

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Diversion
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Re: PR4-GT

Postby Diversion » Wed Jul 29, 2015 5:19 pm

Check your tire pressure with a different gauge you might have less air in than you think
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Bernie
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Re: PR4-GT

Postby Bernie » Wed Jul 29, 2015 6:38 pm

Jeffsy1 wrote:The back tyre has no unusual wear, or middle flat spot. The PR2 developed a flat spot, however it did not tramline to this extent.

Well, I replaced my rear PR4-GT after only 10K Km, only 2 weeks ago, and it had a very definite flat strip, at least 2 inches wide.

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captaingeoff
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Re: PR4-GT

Postby captaingeoff » Thu Jul 30, 2015 5:11 am

Just put PR4's on, sure hope that they give me more than 14k as I got 17.5k out of the angel gt's I just had and the handling and grip was VERY good
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Sir Price
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Re: PR4-GT

Postby Sir Price » Thu Jul 30, 2015 1:57 pm

I got about 12k maximum from a the last PR3 on the front and around 10K on the rear , recently fitted a PR4 GT to the rear , good in the wet or dry but at 42 PSI it seems to transmit too many road undulations making the suspension work harder and making the ride a little harsh on some of our more bike friendly roads. We will see what sort of life span it has when I recover from Rotator Cuff repair ,, 4 months off the bike minimum :violin:
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