Rear Tire flat spot

[Guest]

Nope, just some idiots around here that can't drive. Maybe I was going a little fast, but hey I'm alive. lol. Seriously wasn't that far or that fast. Did spook me though, reminds you to thank the Good Lord above for not doing the kiss of death on the asphalt, and for another day above ground and able to go to work on 2 wheels. Gotta get new rubber soon, bump bump bump gets a bit annoying. And I am going with shinko. Haven't decided on the 230 tour masters or the 712.

Back when I took drivers' ed, defensive driving was emphasized. The instructors said that, when a person is driving defensively, crashes should almost never happen. And emergency breaking that is hard enough to skid or make the tires squeal shouldn't happen more than about once in seven years. My real world experience bears that out.

 

[raistian77]

Back when I took drivers' ed, defensive driving was emphasized. The instructors said that, when a person is driving defensively, crashes should almost never happen. And emergency breaking that is hard enough to skid or make the tires squeal shouldn't happen more than about once in seven years. My real world experience bears that out.

this^^

Also, a trick I learned is when I am on a multilane roadway with a turn lane I expect lots of left turners. I ride in the left side of the left lane, makes me more visible and keeps me out of the cars pillar blind spot. Also if you are in the right lane traffic in the left and middle lanes can hide you making the left turner think the road way is clear when it is not.

 

[pano]

Rear tire flat spot ISSUE RESOLVED

Rear tire flat spot ISSUE RESOLVED

ISSUE RESOLVED

Turns out it was a bad counter sprocket.

This all started with a loping in the drive train that increased with speed. When I looked at the chain while driving I could see it oscillating. I figured it was my chain since it was pretty lose. I tightened the chain but the loping persisted.

I then looked at my tire closely while spinning in first gear on the centersand. I do see a 6-8 inch area where the outside of the tire appears to be out of round, it does not bubble out but looks like it depresses in. Hence what I considered a flat spot.

I later went to recheck to make sure when I tightened the chain the rear tire was aligned properly, it was, but I also noticed the chain making the loping sound when the tire was off the ground.

I removed the cover to the countersprocket and the teeth were clearly worn. When I removed the sprocket, the 3 screws that hold the counter sprocket assembly together were all sheared and the sprocket fell apart.

I replaced it with a spare and everything is fine.

The tire may be slightly out of round but must be with-in specs (shrug)

I also know I should replace the sprockets and chain as a whole but I had a spare countersprocket in stock.

 

[chuckycheese]

Cool

Cool

Very interesting! Thanks for the report. I think this may be one of the very rare instances where the solution wouldn't have been found by doing a 'search'.

 

[Guest]

Excellent. Makes more sense than wearing a tire flat in one skid.

 

[Billy Ricks]

Personally I'm skeptical about the bad countershaft sprocket causing the flat spot. Even if you had something like 15/45 gearing so the sprocket ratio would be exactly 1:3 you should have 3 flat spots due to chain snatch. And if you do have a ratio with decimals the snatch would be even less frequent at the same spot on the tire.

Are you sure the bead is seated all the way around on both sides of the tire? If it is I'm beginning to thing you got hold of a bad tire. If it's out of round enough to see it something's up.

 

[pano]

Personally I'm skeptical about the bad countershaft sprocket causing the flat spot. Even if you had something like 15/45 gearing so the sprocket ratio would be exactly 1:3 you should have 3 flat spots due to chain snatch. And if you do have a ratio with decimals the snatch would be even less frequent at the same spot on the tire.

Are you sure the bead is seated all the way around on both sides of the tire? If it is I'm beginning to thing you got hold of a bad tire. If it's out of round enough to see it something's up.

The issue was definately the sprocket since it drives smooth now. Whether the tire is a bit out of round from the factory or became so from the sprocket I don't know, but the tire looks correctly sealed all the way around.

For what I paid for the tire ($60-70) I don't think its worth the cost to have the tire remounted, but I will keep an eye on it.