Rear PR2 Scalloped - K-Bikes.com - Excellence in Motion
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post #1 of 12 (permalink) Old Aug 29th, 2008, 4:27 am Thread Starter
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Rear PR2 Scalloped

Ive just returned from a 2500 klm rally with BMW Australia and after cleaning the GT yesterday and doing a tyre inspection I have noticed the rear Michelin is unevenly worn.

The outer grooves, probably 1.5 - 2 inches from the centre are worn more on the leading edge of the groove than the trailing edge.

By this I mean the edge of the groove that makes contact with the road first when in motion.

This tyre has only done 8000klm or about 5000 miles and the leading edge has about 2.5ml of tread while the trailing edge of the groove has about 5.

Has anyone else experienced this with PR2s?

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post #2 of 12 (permalink) Old Aug 29th, 2008, 4:50 am
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I had this similar thing happen to me on the front tire , running BT021, the whole left side
of the front wore out a lot more, that day I was riding on rough ashfault lots of twistees but no potholes, also had about 8000k on those ties,
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post #3 of 12 (permalink) Old Aug 29th, 2008, 9:12 am
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My tires, rear more than front, always wear a bit unevenly, but not enough to effect handling. I've always chalked it up to the bike not being perfectly balanced or symmetrical, especially with my fat butt riding and shifting weight as I go down the highway.

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post #4 of 12 (permalink) Old Aug 29th, 2008, 9:15 am
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I have 8000 miles on my tires. The front is still good. The rear is almost flat in the center. Maybe, I don't lean over enough in the curves. Maybe it is time to replace ?

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post #5 of 12 (permalink) Old Aug 29th, 2008, 9:16 am
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I have Pilot Road 2s, but only 2000 miles (3200 km) on them. No signs of significant wear yet.

Dadi - Are you riding a lot of twisties? If so, could it be that the softer, grabbier outsides are wearing faster than the harder, higher mileage centers?

Silvano - It is common to have more tire wear on the left side of your tires here in the U.S. The explanation is that roads are crowned (arched) to let rain run off to the sides. Because we drive on the right side of the center line, the left side of the lane is higher. The rain water drains to the right. Because the road is slightly higher on the left side, the left side of your tire wears a little faster.

In England and Australia, where they drive on the left side of the road, the right side of the tire wears down faster.
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post #6 of 12 (permalink) Old Aug 29th, 2008, 1:50 pm
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I had PR 2's put on in early May, about 3000 miles ago. The front is scalloping but not the rear. I can also clearly see the difference in tread compounds on both tires as the center inch and a half is slightly raised and then drops off to the sides of the tires. I love the grip, but time will tell on the wear.

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post #7 of 12 (permalink) Old Aug 29th, 2008, 6:40 pm
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Just a couple of thoughts. Maybe you've already gone through this.

How's the tire pressure? What were the loads, weight wise on the bike for the trip?

Is the tire balanced? All the lug bolts torqued to spec on the rear?

John
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post #8 of 12 (permalink) Old Aug 29th, 2008, 7:12 pm Thread Starter
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John I keep my tyres to spec as often as I can. I run 2.9 bar on the rear as the manual states.
I do a lot of twisty/sweeper type riding and for most of the rally I was fully loaded (panniers and topbox) and for the last 800klms was also 2up.
We covered the best piece of road I have ever ridden on the second to last day that may be the cause of the wear.
In North Queensland, just outside of Cairns we descended what is called the "Gillies Ranges" which was 19 klm or 12 miles of back to back twisties that apparently holds 258 bends/corners while it descends about 2500 feet.
The vast majority are speed rated at 40kph with the rest at 30kph. The surface was fresh and clean, I was in heaven.
After the first 20 or so corners I had the GT scraping something on the left hand side everytime and this was while loaded and 2up.
So I might be the cause of this unusual wear.
I did find an entry on another sports bike site when I googled it that showed the same problem with another rider though.
He had run what looked like a white paint roller over a section of the tread that clearly showed the cupping in the tread.
Oh well, at $275 fitted and 8000ks already travelled on it I figure Im down $100 if I replace it now and if thats the cost of that riding experience I got out cheap.
Unfortunately no 180/55/ZR17s available in Australia for at least another 3 weeks??

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post #9 of 12 (permalink) Old Aug 30th, 2008, 12:08 pm
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My wife put 12000 km on her PR2 set/F800ST/ and there was no uneven wear and the tyres still looked good. Decided to replace them on the way to Norway "just in case - to be on the safe side", not to waist time there looking for a dealer instead of riding. MeZ6 now.

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post #10 of 12 (permalink) Old Aug 31st, 2008, 10:34 am
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Quote:
Originally Posted by XMagnaRider
It is common to have more tire wear on the left side of your tires here in the U.S. The explanation is that roads are crowned (arched) to let rain run off to the sides.
Right symptoms, wrong cause. The crown in the roads simply isn't steep enough to account for the difference in wear between the two sides of the tire. Rather, it is due to the fact that those who drive on the "right" side of the road take a much larger arc when turning left (and thus travel further) than when making shorter right turns. Of course, the opposite is true for those who drive on the "wrong" side of the road.

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