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Tires, Tire Mounting & Demounting Do you have a favorite set of tires? Tell us about them here.

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Old April 7th, 2014   #1
carter
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Default Rear tire flat spot

Recently bought an 05 ST it's lovely. Rear tire I noticed has worn so the center has a flat spot. Never noticed this happening on other bikes but does this sound normal and is it time to replace? I think they are Dunlops.

I have Metzler 880's on my PC800 and have not noticed a wear pattern like that with them. Owner wasn't sure how many miles were on this set.
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Old April 7th, 2014   #2
DanK
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Default Re: Rear tire flat spot

Is it one flat spot or is the whole center of the tire worn flat? The former can result from a panic stop with the rear tire locked up. A general flat area around the tire tyically comes from lots of straight line or interstate riding and can be exacerbated but too high of tire pressure. Remaining tread in the grooves should help you determine the need to replace the tire, but if it is worn flat it probably is time. Err on the side of caution.
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Old April 7th, 2014   #3
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Default Re: Rear tire flat spot

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Err on the side of caution.
Is the correct answer, to much straight line acceleration, lack of cornering and novice riding are culprits.
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Old April 7th, 2014   #4
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Default Re: Rear tire flat spot

This was typical when I used to do a lot of IBA long distance riding on the interstates.

Now, it's just the opposite because most of my riding is now in the rural twisties.

The latter is more fun, BTW. ;-)
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Old April 7th, 2014   #5
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Default Re: Rear tire flat spot

It is the whole tire which leads me to believe it was a lot of highway driving.
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Old April 7th, 2014   #6
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Default Re: Rear tire flat spot

I once had two tires that, if cut, the profile would have looked like half of a hexagon. The center was flat as were both sides.

Weirdest tire-wear I had ever seen.

The feel of it was weird too.

;-)
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Old April 7th, 2014   #7
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Default Re: Rear tire flat spot

<--- I'm having the same issue!

Dale
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Old April 7th, 2014   #8
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Default Re: Rear tire flat spot

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Originally Posted by zldrider View Post
I once had two tires that, if cut, the profile would have looked like half of a hexagon. The center was flat as were both sides.

It's becoming more common now with so many dual compound tyres, the centre band being made of harder rubber to stop it wearing as much as the side walls which are softer compound allowing more grip and hence more wear as the bike is tipped over, the consequence being there is a point where the soft rubber and hard rubber meet which causes the stepped effect.
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Old April 8th, 2014   #9
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Default Re: Rear tire flat spot

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<--- I'm having the same issue!

Dale
In a BIG way
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Old April 8th, 2014   #10
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Default

Except, this was before compound tires. I had a Metzeler Z4 front and a Metzeler ME880 bias ply on my '98 ST1100.

The sides were worn from a long term side wind in northern CA, one side from the ride west, one side from the ride east.

The center was worn, of course , by the long interstate ride to and from WA State.

This was back in 1999 or 2000.

Quote:
Originally Posted by Rob2m View Post
It's becoming more common now with so many dual compound tyres, the centre band being made of harder rubber to stop it wearing as much as the side walls which are softer compound allowing more grip and hence more wear as the bike is tipped over, the consequence being there is a point where the soft rubber and hard rubber meet which causes the stepped effect.
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