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Discussion Starter · #1 ·
I recently got a CB750 back on the road. After riding it around for a few weeks, I notice that the front tire is wearing to a point. Left and right of center is wearing to bald, and the edges have normal wear. This results in a pointed tire that is almost impossible to ride in corners. Before I put a new tire on, I want to know what might be causing this so I don't wear out the next tire.

this is what it looks like:

|***|
|***|
|***| <-- edges are normal
\***/
>\*/<-- This has been worn resulting in a pointed tire (both sides equally).

The centerline is worn kind of patchy, a patch left, patch right creating kind of a zigzag. It's as if the bike doesn't want to ride down the center.

Possible causes:
I rode around will low air pressure for a few weeks.
They are old tires, maybe even originals.
I've been riding on them for about 1 month.
There is a possibility that my forks are not perfectly aligned. I lowered the right fork a few centimeters to make the rotor run parallel to the break caliper. (I would assume that this would result in wear on only one side if it was a problem.)

Any experience with this would be helpful. I don't want to put a new tire on and have the same result in a few weeks.
 

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Discussion Starter · #4 ·
quote:I don't understand how lowering one fork tube would change the alignment of the caliper and the disk.
There is a screw with a spring you can use to align the caliper to the disk, but there is no way to adjust the (tilt of the) caliper if it is not perfectly parallel to the rotor. If it isn't parallel, the pad wears at an angle and doesn't retract properly resulting front break squeal. My solution was to drop the right fork a bit, which aligns the rotor parallel with the caliper (attached to the left fork,) thus putting both forks on a parallel plane. I don't know another way to adjust the tilt of the caliper, or rotor.
 

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Discussion Starter · #5 ·
Thanks for the replies. The bike pulls to both sides and is a bitch to maneuver at slow speeds and in corners. It does this because the tire is worn to a point. It doesn't track left or right because of a front to back alignment issue.

I'm thinking of putting the new tire on, and then chalking it and watching the wear carefully. If the situation is resolved by proper tire pressure, then problem solved. If not, then I'll revisit the issue here.
 
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