Author Topic: Michelin PR 4  (Read 11958 times)

Offline Crocman

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Re: Michelin PR 4
« Reply #25 on: September 07, 2015, 01:17:21 PM »
Found a set of PR 4 at Motorcycle Tyre warehouse at Brendale going to get them fitted now https://motorcycletyrewarehouse.com.au/
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Re: Michelin PR 4
« Reply #26 on: September 07, 2015, 01:32:35 PM »
Found a set of PR 4 at Motorcycle Tyre warehouse at Brendale going to get them fitted now https://motorcycletyrewarehouse.com.au/

That's a bargain from them!
I got my Oxford hot grips there and their quote for tyres was higher than my regular supplier in Brendale.
I guess it's because they are superseded that they have that great PR3 special on their website revolving banner.
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Re: Michelin PR 4
« Reply #27 on: September 07, 2015, 06:19:47 PM »
My front is 120/70 18, $245.00 (PR4)
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Offline tj189

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Re: Michelin PR 4
« Reply #28 on: September 07, 2015, 06:53:30 PM »
set of PR4 here in Brissy for $449 fitted. saw them on the weekend

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Offline JC

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Re: Michelin PR 4
« Reply #29 on: September 16, 2015, 07:41:12 AM »
hey Guys looking around Brisbane and trying getting a Michelin Pilot Road 4 but the book says 17 inch front and mine is 18nch making it more expensive is this just a one off or are the shops taking the piss out of me I been quoted $250 just for the front ? my current tyres are  front 12/70  18  rear 170/60  17

18" front wheels/tyres are the original fitment for the ST's

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Re: Michelin PR 4
« Reply #30 on: October 07, 2015, 10:52:19 AM »
I did a few short trips in the last couple of weeks, about 2500k in total, and in that time, it seems the rear PR3 wore a lot more than the previous 5000ks. Not complaining as I got between 15 and 20 thou out of them on both my ST's, but it was a bit embarrassing as I just had a rego check and didn't check the rear tyre before I took it in.... :-[

My previous set of Michelins on my MT01 wore incredibly quick in the last 500k's, but that was a much light tyre, but it's got me wondering about the last part of a tyres life. It seems to go from being OK to very marginal in a relatively short period of time, so it just makes me more careful about recording distances and keeping a close eye on tyre wear, particularly rears, as the tyres come to the end of their lives.

Another observation that I've made over time is that cold to hot pressure increases for rear tyres are double that of the front tyres - depending on the ambient temps, rears go from 42 psi up to sometimes over 52psi, and fronts are lucky to hit 47psi hot. Also, temp increases are way more in the rear tyre from the front tyre as well. In 30deg heat, rear tyre has seen over 55deg, and fronts about 10 deg lower. The lesson for me is to spend the time monitoring the rear tyre over the front, as it is far easier to look at the front than to get down and have a good look at the rear, particularly if you have a towbar and mudflap blocking your view.  :-[

I was going to order a set of Pirelli GT's but having a closer look at them, they don't appear to make an "A" version in ST sizes, which is most likely not going to be a problem, as many have used them on heavy bikes like the ST with great results for both grip and wear, but as PR4's are available with a heavier carcass for heavier bikes like the ST, I ordered a set of them. I also just checked the Pirelli website and they actually say they don't make a Angel GT to suit!  :eek Even though they make the correct sizes for the ST, they don't recommend running them? That's interesting.... :think1 They don't seem to make any tyre to suit an ST, and the only size that will fit the ST isn't recommended??

Whilst I've had no problems with standard PR2's and 3's, I wanted to try a tyre designed for a heavier bike and compare the difference, so hopefully, these new PR4's will feel as good as the PR3's, and I'll be taking notice of the pressure and temp increases in the rear to see if they are significantly lower than the PR3's.
« Last Edit: October 07, 2015, 11:03:46 AM by atoyot »
 

Offline StinkyPete

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Re: Michelin PR 4
« Reply #31 on: October 07, 2015, 11:03:54 AM »
On the strength of a hint from the Forum, I went from 42 front and rear, to 42 front and 44 rear.   This has extended my PR tyre life by around 4,000km and I now get around 22,000 from a set.  Hot pressures rise by 5-8psi depending mainly upon the heat of the day.  (Garmin Tyre Pressure Monitors)

On the matter of tyre wear in the last part of a tyre's life, I recall reading, or having it explained in this way....     When a tyre is newer, the rubber is thicker and there is more flex within the depth of the rubber through the contact patch.   When the tyre is worn, the rubber of the contact patch is thinner, there is far less flex to absorb irregularities through the depth of the rubber, and hence it wears quicker.   It could be bull@#$%, but it sounded reasonable to me.
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Offline Gadget

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Re: Michelin PR 4
« Reply #32 on: October 07, 2015, 11:34:53 AM »
I was happy with the PR4s I had and was disappointed I couldn't get another set, but the PR3s were a good fallback.
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atoyot

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Re: Michelin PR 4
« Reply #33 on: October 07, 2015, 02:34:24 PM »
On the strength of a hint from the Forum, I went from 42 front and rear, to 42 front and 44 rear.   This has extended my PR tyre life by around 4,000km and I now get around 22,000 from a set.  Hot pressures rise by 5-8psi depending mainly upon the heat of the day.  (Garmin Tyre Pressure Monitors)

On the matter of tyre wear in the last part of a tyre's life, I recall reading, or having it explained in this way....     When a tyre is newer, the rubber is thicker and there is more flex within the depth of the rubber through the contact patch.   When the tyre is worn, the rubber of the contact patch is thinner, there is far less flex to absorb irregularities through the depth of the rubber, and hence it wears quicker.   It could be bull@#$%, but it sounded reasonable to me.
On occasions, I've also upped my rear tyre pressure to 44 as well, but I was doing this the same time as I was playing with the damping on the rear shock, so probably can't draw conclusions about the ride quality, but I'm sure that you are correct with the extra mileage you get from them.

Interestingly, a rep selling Michelins was in the shop this morning when I was there, and looking at the previous set of PR3's and my old set of Dunlops, he highly recommended the GT version of the PR4's for the ST, as he made some interesting observations on the wear characteristics of both sets my old tyres, particularly about the cupping in the tread front and rear, and the "gumballing" on both sides of the rear. Reckons the heavier carcass will suit the ST perfectly, so I guess I'll find out soon  :whistle
 

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Re: Michelin PR 4
« Reply #34 on: October 07, 2015, 03:02:31 PM »
The tyre shops here recommend the GT as well. They seem to be working for me
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Offline Gadget

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Re: Michelin PR 4
« Reply #35 on: October 07, 2015, 05:45:42 PM »
The GTs worked for me.
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Offline JC

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Re: Michelin PR 4
« Reply #36 on: June 26, 2017, 06:32:58 PM »
Third photo of the rear shows it's down to the indicator on the right side, but there's plenty of tread left on the left. Damn that road camber...    :well
I therefore disagree with Brock, and think the tyre is close to the end of it's legal life.   

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