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02-16-2004, 05:52 PM

On 16 Feb 2004 04:31:42 -0800, tonydamicomd@yahoo.com (Tony) may have
said:

>Hello, have a question that is puzzling me and I hope someone can
>help.
>
>I have a 99 Specialized StumpJumper Comp. I commute to work in
>Michigan, about 2.75 miles each way. It is cold out but the sidewalks
>are usually clear, maybe ride a little ice and packed snow at
>intersections.
>
>My question is my rear tires are getting these weird diagonal lines on
>the sidewalls where the tire just seems to be thinning out. This
>first happened on a Hutchinson Alligator. I only noticed it when a
>few of these wearing out bands got so bad that the tube was actually
>bulging out. So, I switched it out for a Specialized Dirt Master comp
>which is on a different rim. Now I am noticing the same wear pattern
>on this second tire.
>
>It is multiple diagonal lines that run almost the entire sidewall.
>They are spaced less than an inch apart and it just looks like it is
>wearing out. I thought at first it must be rubbing but I can't see
>anywhere that the tire doesn't clear the frame and the brake pads
>aren't far enough out to cause it. It is not abrasion from rocks or
>whatever because I am riding only on the sidewalks and roads, and only
>very occasionaly these aren't cleared of snow. Is it the cold?
>Haven't had any problems with the front tire though, still has the
>Hutchinson on it and no problems.
>
>Any Ideas?

If you ride on the big rear cog or small front cog a lot, I'd look at
the possibility of lateral chain slap, possibly due to a stiff pivot
on the rear der. This is just a guess, but that's where I'd start.
Also, look for a front der cable end that might be rubbing on the
tire. beyond that, you've got a real puzzler...and I wouldn't give
better than one in 20 odds of my suggestions being the cause.

--
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Typoes are not a bug, they're a feature.
Words processed in a facility that contains nuts.

02-16-2004, 05:52 PM	#19 (permalink)
Werehatrack Guest Posts: n/a	Re: Bizzare Tire Wear On 16 Feb 2004 04:31:42 -0800, tonydamicomd@yahoo.com (Tony) may have said: >Hello, have a question that is puzzling me and I hope someone can >help. > >I have a 99 Specialized StumpJumper Comp. I commute to work in >Michigan, about 2.75 miles each way. It is cold out but the sidewalks >are usually clear, maybe ride a little ice and packed snow at >intersections. > >My question is my rear tires are getting these weird diagonal lines on >the sidewalls where the tire just seems to be thinning out. This >first happened on a Hutchinson Alligator. I only noticed it when a >few of these wearing out bands got so bad that the tube was actually >bulging out. So, I switched it out for a Specialized Dirt Master comp >which is on a different rim. Now I am noticing the same wear pattern >on this second tire. > >It is multiple diagonal lines that run almost the entire sidewall. >They are spaced less than an inch apart and it just looks like it is >wearing out. I thought at first it must be rubbing but I can't see >anywhere that the tire doesn't clear the frame and the brake pads >aren't far enough out to cause it. It is not abrasion from rocks or >whatever because I am riding only on the sidewalks and roads, and only >very occasionaly these aren't cleared of snow. Is it the cold? >Haven't had any problems with the front tire though, still has the >Hutchinson on it and no problems. > >Any Ideas? If you ride on the big rear cog or small front cog a lot, I'd look at the possibility of lateral chain slap, possibly due to a stiff pivot on the rear der. This is just a guess, but that's where I'd start. Also, look for a front der cable end that might be rubbing on the tire. beyond that, you've got a real puzzler...and I wouldn't give better than one in 20 odds of my suggestions being the cause. -- My email address is antispammed; pull WEEDS if replying via e-mail. Typoes are not a bug, they're a feature. Words processed in a facility that contains nuts.