Rear tire “cupping” on one side only - Honda CTX1300 Forum
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post #1 of 15 Old 10-16-2018, 09:20 AM Thread Starter
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Rear tire “cupping” on one side only

My CTX rear ExedraMax has over 9,000 miles on it, and I’ve noticed that, in addition to it wearing in the center, it has “cupped” down to the wear marks about 1/2” off of the worn area - but only on the left side. Right side still looks rounded. Any ideas why? Anything to worry about? I KNOW I am not avoiding right-hand turns by making three lefts!!! And I feel like I ride through RH corners better than LH.

If this were on a car, I would say I have an alignment problem. Any chance of that on our bikes? Just wondering. Gonna get a new tire, but if something is out of spec, would like to attend to it during the change. Thx.

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post #2 of 15 Old 10-16-2018, 10:49 AM
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Probably it's just time to change it.
Never reached 9K miles on any of my CTX tires including the Exedras , it's more 5K !

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post #3 of 15 Old 10-16-2018, 12:38 PM
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Maybe a combination of under-inflated tire and riding a lot on "crowned" roads (high point of road in center). I had it happen on my front tire, the OEM Dunlop, showing up near the end of it's life (9,200 miles). I know I had ridden a couple thousand miles with it under-inflated. I replaced with an Excedra Max and have been better keeping an eye on tire pressures. No funny wear when I replaced the Excedra at 9,000 miles. Probably could have gone another 1-2K miles, but I needed to replace the rear and decided to do both at the same time.

I suppose bikes could have alignment issues after an accident or something, and I would think it would have to be real noticeable (and a longitudinal twist of frame or forks) for it to start chewing tires. Otherwise, two tires, and one being free to move (steering), would naturally play well together, even if making the bike yaw. It's when there are more tires (fixed relative to each other) that a fight may break out. I agree with @psullam , probably time to change the tire.
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post #4 of 15 Old 10-16-2018, 12:40 PM
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Somewhere I read (on this forum or maybe the ST-Owners forum) that one thought is you ride a lot of roads that have a significant "crest" in the center, or slope down from the center line to the shoulder. Either that or you do a lot of left turns and curves.

This issue has been noted on a number of different bikes that I am aware of.

/bob
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post #5 of 15 Old 10-16-2018, 12:51 PM
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The left side (*) is always worse. And this is not a political opinion.



https://www.ctx1300forum.com/forum/wh...-colorado.html


(*) of the tires
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Paul S.
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1985 Kawasaki 450LTD
1988 Honda VF750C "Super Magna"
1992 Yamaha Virago 250
1994 Yamaha FJ1200ABS
2000 Suzuki Burgman 400
2003 Triumph Trophy 1200
2004 Kawasaki Concours 1000
2015 Honda CTX700 manual shift
2015 Honda CTX1300 D
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post #6 of 15 Old 10-16-2018, 01:20 PM
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Originally Posted by psullam View Post
The left side (*) is always worse. And this is not a political opinion.


(*) of the tires
I wonder if our friends in the UK or Oz have noticed issues with the right...?
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post #7 of 15 Old 10-16-2018, 06:22 PM
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Welcome to riding dual compound tires, as stated it mostly is a normal wear pattern especially if you ride mostly secondary twisty roads with high center crowns. I ve see this more on sport bikes and sport touring bikes. It could also be inflation too. However if you check your pressure regularly than that is not the problem. Just dual compound tires. My OEM Exedras have very slight cupping as well. They lasted 10,085 miles to the wear indicators. The bike is at the dealer as I write this to replace them with Exedra-Max tires.
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post #8 of 15 Old 10-16-2018, 09:36 PM
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Quote:
Originally Posted by Stirling View Post
I wonder if our friends in the UK or Oz have noticed issues with the right...?
I must say I haven't noticed , as our roads are perfectly engineered ... ( ummmmmmm crap )
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post #9 of 15 Old 10-16-2018, 10:40 PM Thread Starter
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Crowning of highways makes sense. Ordered a new tire today. Per a forum member post, got a new Exedra Max radial from americanmototire.com for $139.77, shipping included.
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post #10 of 15 Old 10-17-2018, 07:34 AM
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Penso che sia anche perché il motore ctx e stato spostato 2 cm a destra per montare un pneumatico più largo (200) rispetto al paneuropean (160)
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