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Online Paul2bikes

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Offline Paullie

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Re: Motorbike Camping and Porlock Hill :)
« Reply #21 on: 10 August, 2018, 10:46:54 AM »
Interesting reviews. Though that first one didn't test on the (for me) all-important wet grip. Typical slack journalism in the bike mag industry, I'm afraid.

Still very happy with my PR4s, though I note they're a bit more squirmy than the previous PR4 GTs, and the front-tyre cupping is definitely to watch for. I found running my front at 38 seems to solve that.

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Re: Motorbike Camping and Porlock Hill :)
« Reply #22 on: 10 August, 2018, 10:59:19 AM »
*Originally Posted by Paullie [+]
I note they're a bit more squirmy than the previous PR4 GTs

Squirmy? Is that like on white lines, overbanding, truck lines, where the front wheel follows whatever in the road? I've found that a Michelin trait. Same with their car tyres. I've got PR4's on 'cos last set lasted so long but they were shoite towards the end.

I think all the top end tyres are far better than the average rider will ever need, it's just a personal thing. The only tyres that to me felt really bad were BT021, all the other Bridgestones I had felt fine to the end.
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Re: Motorbike Camping and Porlock Hill :)
« Reply #23 on: 10 August, 2018, 11:05:27 AM »
The greatest deception men suffer is from their own opinions.
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Offline Paullie

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Re: Motorbike Camping and Porlock Hill :)
« Reply #24 on: 10 August, 2018, 11:14:34 AM »
*Originally Posted by Paul2bikes [+]
Squirmy? Is that like on white lines, overbanding, truck lines, where the front wheel follows whatever in the road? I've found that a Michelin trait. Same with their car tyres. I've got PR4's on 'cos last set lasted so long but they were shoite towards the end.

Yeah, I noticed a real difference when I replaced the previous PR4 GTs (fitted by previous owner) with straight PR4s. The new tyres gnerally gave a softer, more comfortable ride than the GTs, with less skittering from the rear over poor road surfaces. But the front also felt more reactive to road undulations, and certainly cups easily.

Once I got used to them, everything was fine. But maybe in the future I'd try a GT front with a normal rear (as I don't really carry heavy loads that much), though don't know if that's a good idea or not. In any case, won't make a final decision until their time is up and I've been able to measure the mileage.

Online dreamer

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Re: Motorbike Camping and Porlock Hill :)
« Reply #25 on: 10 August, 2018, 11:28:18 AM »
What's cupping?

Offline Texan Rider

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Re: Motorbike Camping and Porlock Hill :)
« Reply #26 on: 10 August, 2018, 12:25:39 PM »
Cupping is when the tread on your front tire begins to show a pattern of raised tread, sorta like it's trying to sprout horns all along the tread.

This is caused by overloading the rear of the bike, causing the front to "bounce" as you're riding along. 
You can't really feel it, but it is noticeable when trying to lean into the corners.
The bike's balance point from front to back has moved back towards the heavy load in the rear.

Taking a short trip one time won't cause the cupping immediately, but you will notice it over time.
The first thing you'll notice is the different handling through the corners.

Incorrect tire pressure also plays a role when the back is not overloaded with "stuff."
An underinflated tire can also cause the same effect because the bike "bounces" along on the front tire.
The underinflation doesn't give the support it should.

An underinflated rear can also cause the same problem on the rear tire, and the lack of handling definitely more noticeable.

You can Google "motorcycle front tire cupping" to see images.
« Last Edit: 10 August, 2018, 12:34:33 PM by Texan Rider »
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Re: Motorbike Camping and Porlock Hill :)
« Reply #27 on: 10 August, 2018, 12:51:36 PM »
The greatest deception men suffer is from their own opinions.
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Re: Motorbike Camping and Porlock Hill :)
« Reply #28 on: 10 August, 2018, 01:06:04 PM »
I thought there was a funny smell  :006:

Thanks Texan Rider, I hadn't heard of that before.  I'll keep an eye on it !  Investigating panniers at the moment...

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Re: Motorbike Camping and Porlock Hill :)
« Reply #29 on: 10 August, 2018, 01:19:26 PM »
*Originally Posted by dreamer [+]
I thought there was a funny smell  :006:

Thanks Texan Rider, I hadn't heard of that before.  I'll keep an eye on it !  Investigating panniers at the moment...


Ha.

Don't bother with the trumpet panniers, they feel full when empty, inside out Tardis's we calls um.


I have these Trax, Givi do similar now.

The greatest deception men suffer is from their own opinions.
Leonardo da Vinci