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General Category => Interesting Links => Topic started by: Sabie on March 24, 2014, 09:35:07 PM

Title: Tyre Cupping or Tyre Scalloping
Post by: Sabie on March 24, 2014, 09:35:07 PM: Interesting

http://w6rec.com/duane/bmw/cupping/index.htm (http://w6rec.com/duane/bmw/cupping/index.htm)
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: BigTed on March 25, 2014, 12:46:20 AM: Thanks Sabie, nice find. Now I know it's not actually a problem. :thumbsup
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: jimwilly on March 25, 2014, 09:14:37 AM: Good read, Ive often had conversations with other riders that blame all sorts of things for cupping.
I always blamed it on road camber.
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: johnnyYTED on March 25, 2014, 01:54:05 PM: :dred11
this is my rear tyre after Ballarat, could it be my 1st time pillion was sitting slightly to the right looking over my shoulder, I felt my bike wasn't vertical but I put it down to towing and Pillion also trye pressure was down
(http://i774.photobucket.com/albums/yy22/Johnny_Whitehead/20140324_174205_zpsdz6v5i6x.jpg) (http://s774.photobucket.com/user/Johnny_Whitehead/media/20140324_174205_zpsdz6v5i6x.jpg.html)
the other side of tyre
(http://i774.photobucket.com/albums/yy22/Johnny_Whitehead/20140324_174247_zpsrhtnpbv8.jpg) (http://s774.photobucket.com/user/Johnny_Whitehead/media/20140324_174247_zpsrhtnpbv8.jpg.html)
very unusual wear,mayB i should turn left more... :crackup
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: Biggles on March 25, 2014, 04:31:07 PM: I'm far from an expert, but that looks like it was under-inflated for your pillion load.
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: johnnyYTED on March 25, 2014, 06:00:17 PM: :dred11
Quote from: Biggles on March 25, 2014, 04:31:07 PM
I'm far from an expert, but that looks like it was under-inflated for your pillion load.

yes you might be right Biggles,, my STeed isnt used to such a pillion overload.. :crackup
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: Wild Rose on March 25, 2014, 06:31:46 PM: Quote from: johnnyYTED on March 25, 2014, 06:00:17 PM
:dred11
Quote from: Biggles on March 25, 2014, 04:31:07 PM
I'm far from an expert, but that looks like it was under-inflated for your pillion load.

yes you might be right Biggles,, my STeed isnt used to such a pillion overload.. :crackup

I had the same looking tyre on my 02 ST1300 a few years back after riding on a tyre with a slow leaking on my way to Lightning Ridge
It got me back to Toowoomba after pumping it up again

I think you might have to do a trip to the bike shop for a new tyre :fp
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: johnnyYTED on March 25, 2014, 06:50:04 PM: :dred11
I dont think I'll be riding anywhere b4 I get a new one. :law I looked at my receipt and I've done over 11k k's on this tyre so not bad considering trailer weight also for about 3k of that.. will get r angle nipples too...
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: Sabie on March 25, 2014, 11:15:11 PM: To minimise cupping you still need to have the correct tyre pressure, but it makes sense to me. My font tyre is starting to show signs of cupping on this trip, tyre pressure has been closely monitored and yet cupping is still forming.

I do believe under inflated tyres would contribute to the severity of the cupping and the speed and magnitude of the cupping.

Correct tyre pressure is always the right way to go.
Title: Re: Tyre Cupping or Tyre Scalloping
Post by: saaz on March 26, 2014, 08:54:23 AM: Under inflation and suspension that is too soft (soft springs/lack of damping) can make the tyre flex and work harder, leading to strange wear patterns. Having a tyre not rated for the weight of the bike can be another problem.