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Old 10-18-2013, 12:33 PM   #1
ZX-Dominance
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Life expectancy- 190/55 vs 190/50

I'm replacing the rear tire on my cbr and wanted some input.

Stock height is 50. I'm thinking of moving to a 55. I know this will increase turn in speed, but how will this affect wear?

This bike is 90% commuter, and I will be running a Pilot Road 2, a long lasting tire with a fairly conservative profile.

Anyone have some input as far as rubber no thickness? Is it just the profile that changes or the thickness of the tire?

Thanks
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Old 10-18-2013, 12:56 PM   #2
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Should be just the profile....doubt the contact patch is that much different so the wear should be the same...
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Old 10-18-2013, 12:58 PM   #3
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If nothing else, having a larger OD on the tire will mean that you travel further per wheel revolution, so all else being equal, if there's a 2% increase in circumference, I'd expect about a 2% longer tread life. This may be flawed logic, and there's a lot that influences tire life (road surface, acceleration and braking habits, weight carried on the bike, etc.).
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Old 10-18-2013, 12:58 PM   #4
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oops, replied to wrong thread.
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Old 10-18-2013, 01:01 PM   #5
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Quote:
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If nothing else, having a larger OD on the tire will mean that you travel further per wheel revolution, so all else being equal, if there's a 2% increase in circumference, I'd expect about a 2% longer tread life. This may be flawed logic, and there's a lot that influences tire life (road surface, acceleration and braking habits, weight carried on the bike, etc.).
Interesting logic... But makes sense to me. I was just wondering if the smaller contac patch (if it is noticeable smaller) would cause increased wear. Didn't consider the larger circumference
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Old 10-18-2013, 01:02 PM   #6
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Stick with 190/50 for commuting. When you go to a 190/55 the tire is taller, so your front end will be more loaded.. Suspension will need a bit adjustment.

The 50 profile gives larger contact patch in the center and less lean capabilities in hard cornering.

55 has taller side walls and a little more pointy profile, so less contact in center and a bit more contact at lean...
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Old 10-18-2013, 01:09 PM   #7
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So regardless on traction, it's sounding like a 50 height should distribute the load over more rubber when upright, leading to less wear- despite the slightly smaller overall amount of surface area (smaller diameter)?

The only reason I'd consider the 55 was if it was actually a thicker tire. Same thickness with less contact upright sounds like faster wearing
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Old 10-18-2013, 01:20 PM   #8
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Compound is more important then aspect ratio
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Old 10-18-2013, 02:35 PM   #9
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To the OP,

I would contact John Hutchinson with SCRC (south central race center) and get his EXPERT opinion and information regarding tires rather then info you would get from a forum.

Just my 2 cents...
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Old 10-18-2013, 02:41 PM   #10
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Michelin offers a 190/55-17 "B" spec Pilot Road 3. Designed to be used on the heavier sport touring models and loaded 2 up touring. The BMW K1600GT/L models come stock with a 190/55-17 rear tire. The standard Pilot Road 3 was wearing out way to fast, like 3K miles. This "B" spec tire was Michelin's answer to this problem and does last longer on the big BMW's.
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Old 10-18-2013, 03:23 PM   #11
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I thought K1600GTL come with Metzeler Z8? Friend of mine wore the stock Z8s on his K1600GTL down to cords in less than 5k of nothing but hwy cruising.

Anyhow, better grab those PR2 while you can. PR4 is coming out, PR3 stays but the 2s will be gone.
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Old 10-18-2013, 04:30 PM   #12
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Thanks for the replies fellas. Got in touch with two race shops and discussed it. When it came down to it, the 190/55 was the best choice. It's a thicker tire and although it is "steeper" than a 50, the roads' profile is extremely conservative to begin with and it shouldn't be any twitchier than a standard sport tire at 50.
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Old 10-18-2013, 08:37 PM   #13
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Quote:
Originally Posted by RACER X View Post
Compound is more important then aspect ratio
This.

All else being equal: compound, etc. the differences in wear are negligible, it at sll.
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