[roberthood]

Ok, so I noticed while I started cleaning my chain with the rear wheel suspended on the rear stand, in two spots, about 4-5 inches apart, the wheel scrubs the ground. As I turned it, it would lightly scrub in two separate spots right in the middle of the tire. Not enough to lock up the wheel, but enough to where you could see and hear it and obviously tell it was making contact with the garage floor. I know for a fact I never hit anything that would have caused any damage to the rim or axle so....any thoughts?

My garage floor is level. Tire pressure? I've never seen a wheel do this before, especially one that has never had any substantial impact.

 

[roadster]

Some questions:-

1) After standing overnight or after a recent run?
2) Hot or cold ?
3) new tyre or worn tyre?
4) If you place a fixed pointer immediately alongside the tyre bead very close to the wheel rim do you see any run-out as you turn the wheel?

I think when you have consider the above you may be able to draw your own conclusions.

Regards Roadster

 

[roberthood]

First time on stand ever/bike has been sitting off stand in storage, but has been rolled every other day so tire eventually makes a full rotation as to not get flat spots.

Cold tire

Tire only has 863 original miles

Haven't tried a pointer on the bead

 

[Aufitt]

Its been refitted wrong,

or

Its been out of wheel balance and the tyre has worn to suit.

or

because of the extremely low mileage, flatspots from being parked on the sidestand for long period of time.

or

ridden with wrong pressures.

 

[roberthood]

Sorry, guess I should have stated it's the stock tire. It was never removed, but the chain was adjusted once at the first service.

It was parked since November, but I rolled it a few inches every other day. Needless too say, it's ended up parked in every inch of my garage floor.

I'm really anal about tire pressure so..never rode it with the wrong amounts.

 

[MotoMike]

From what you are describing, it would seem you have a defective tire... separated cords, allowing the tire to "balloon" in those spots where it's touching the floor.

How much clearance does the rest of the tire have in relation to the floor?

 

[pooder7]

From what you are describing, it would seem you have a defective tire... separated cords, allowing the tire to "balloon" in those spots where it's touching the floor.

That seems like a premature conclusion . . .

How much clearance does the rest of the tire have in relation to the floor?

. . . until that question has been answered.

 

[Jme250RA]

it could be that the bike sat in one position longer than the others resulting in the two points at the end of the flat spot being slightly lower than the rest of the tire as the extra material 'pooling' in those points. it may be that after heating up the tire, at the correct pressure during a ride, you could get the tire to return to round.

 

[CBR_Dave]

That seems like a premature conclusion . . .
. . . until that question has been answered.

True, but a rear stand typically has quite a distance between the tyre and the floor. As a result, I would think it would have to be a pretty serious "flat spot" for parts of it to scrub?

Dave

 

[shisoshin]

as roadster said, use a fixed point measure on wheel then tire..
wheel to eliminate the unlikely event of out of round wheel rim..
scrub point is a form of fixed point, but use the same accurate
fixed point as for the wheel, on the tire..

wouldnt hurt to reduce tire pressure then roll the bike
turning the wheel & tire forward and back, recheck,
repeat if necessary low pressure + rubber mallet
just to bed the tire into its rim, increase pressure
incrementally checking each time [repeating the
pressure release process if necessary]..

ultimately if bedded correctly still with a small high spot
you could run it gradually applying a fixed grinder
to the high spot as it turns, physically reshaping
outside tyre surface to more or less round..
tyres can be and are hand shaped..

you can be fussy with fitting tyres just like chains etc etc,
but someone doing it commercially while having understanding
relevant to good fitting isnt necessarily going to take extra
trouble to get your tyre fitted to perfection, thus its up to
you to get whatever level of 'perfection' you need..

with cast wheels it shouldnt be them out of round
the tyre could also be perfect, the two rounded things
not necessarily fitted with perfectly matching roundness'..
i used to use a mattet and bounce tires up and down etc
when fitting them to spoked honda wheels, including
cleaning inner rims leaving a little detergent water
between inner rims and outer tyre beading
to encourage it to move more or less equally
into position on its wheel..

 

[MotoMike]

True, but a rear stand typically has quite a distance between the tyre and the floor. As a result, I would think it would have to be a pretty serious "flat spot" for parts of it to scrub?

Dave

I had the same thought... very strange considering most stands should lift the tire at least a half inch, or more off the floor.

If ever there was a need for pictures, or even better, a video showing the tire as it is rotating and making contact with the floor. How about it Robert?

 

[roadster]

First time on stand ever/bike has been sitting off stand in storage, but has been rolled every other day so tire eventually makes a full rotation as to not get flat spots.

Cold tire

Tire only has 863 original miles

Haven't tried a pointer on the bead

I get the impression that you are quite a cautious owner and I'm not criticising that. But you need to examine/test the tyre again after you have warmed it up to normal temperature. After a ride it should be hot to touch and is likely to have resumed its 'proper' shape. It inevitably cools while stationary on the prop stand and this will leave it slightly out of round. It is even possible that if you are a very cautious rider you haven't run it in at a high enough speed. New tyres are notoriously miss-shapen during storage.

Regards Roadster

 

[CBR_Dave]

I had the same thought... very strange considering most stands should lift the tire at least a half inch, or more off the floor.

If ever there was a need for pictures, or even better, a video showing the tire as it is rotating and making contact with the floor. How about it Robert?

I thought so Mike, hence your comment about a defective tyre / cords etc I'd have to agree with you.

Dave

 

[Wynne G Oldman]

If it's only a mm or so, I wouldn't be too bothered, tyres are not perfectly symmetrical, that's why wheels need to be balanced when a new one is fitted. If it's more than that, then yes, you have a problem.

 

[Aufitt]

When someone has made one thread per mile in the 'problems and issues' section........

 

[spdklls]

When someone has made one thread per mile in the 'problems and issues' section........

That's the pot calling the kettle black if I have ever seen it & the most ironic post I have ever seen..especially coming from the CBR250R forums all time highest poster..98% of which is utterly useless smarta$$ remarks just like the one above.

 

[shisoshin]

ironically tho, irony can have its place in the sun..

 

[Aufitt]

Thought I was meant to on ignore lol.

*ps , Speed doesn't kill.. its the sudden impact.

 

[CBR_Dave]

That's the pot calling the kettle black if I have ever seen it & the most ironic post I have ever seen..especially coming from the CBR250R forums all time highest poster..98% of which is utterly useless smarta$$ remarks just like the one above.

...but which comes with a 1350:3400 tanks to posts ratio.

He must be doing something right if he gets better than 1 thank for every 3 posts.

Not sure what a 58:1200 ratio says .

Dave

 

[spdklls]

I could care less how many thanks I have showing..or what YOUR opinion is of it even less....I have had hundreds of thank yous in private messages since I have been a member in here..Now go stick your nose in somebody elses business