Wobbly arse

[TerminalAddict]

Y'know that feeling when all the air escapes from the back tyre? the rear end goes all wobbly

Y'know that feeling when some of the air escapes, and the rear end gets a bit wobbly?

Well I've got a wobble.
From the back (at least thats how it feels)
my air has not escaped !
40psi in the back, and I could swear I have a flat tyre !!!!!

Things I've thought of:
Dodgy swing arm bearing
Some thing gone askew with the shock
Misaligned back wheel

Any ideas?

Think it might require a visit to the doctors at boyds .. but would be interested to hear opinions

[mashman]

How's your tyre wear? I found that the last time on the Michy's... I checked that everything was torqued properly, that the tyres where at the right pressures, that the suspension wasn't overly harsh or soft... turns out it was my rear tyre being a little square, not too bad, but enough that it felt uncomfortable and slightly wobbly... but it's just a thought...

[TerminalAddict]

mmmm doesn't look very square .. .. looks pretty round

[blacksheep]

don't look at it from the side!

[TerminalAddict]

oddly enough there is something else that could be askew ...

buckled rim maybe? ... not so round shape anymore?

Although I would imagine that would cause havoc at higher speeds in a straight line ... and I can confirm that there is no straight line wobbliness at Mach 2

[avgas]

I had exactly that - 1km down the road the wobble turned into a bounce and i had not rear bearing........haven't used any degreaser lately on the back wheel have you? Your grease mabey going going gone

[TerminalAddict]

mmmm wheel bearing eh?

wonder how I would test that?

[mashman]

Wheel off and check bearing??? could be that you have thrown a weight off the wheel and it's the wheel balance?

[xwhatsit]

mmmm wheel bearing eh?

wonder how I would test that?
Stick it on the centre stand, get to one side of the bike, grab the rear wheel with both hands at 9 and 3, and try and turn the wheel (no, not that way silly) from side to side within the swingarm. If there's any movement, well, you know what to do. Give the bike to me, I'll take it to the tip for you, it's obviously beyond repair.

Tried just rotating the rear wheel in neutral and seeing what it's doing? Any horrible noises, rim not true?

Wheel off and check bearing??? could be that you have thrown a weight off the wheel and it's the wheel balance?
At legal speeds on my primitive machinery, I didn't even notice missing wheel weights. Wasn't until I was checking the spokes and I noticed a sticky bit of adhesive where the weight used to be.

[TerminalAddict]

my notes off all things spent confirm 7000kms on the tyre .. so I think that can rule out tyre deficiancies .....

xerxesdaphat: Funny comment about centre stand :(

time to jack it up on the the frosty rear stand special, and start trying to find things that move, that shouldn't move

[mashman]

At legal speeds on my primitive machinery, I didn't even notice missing wheel weights. Wasn't until I was checking the spokes and I noticed a sticky bit of adhesive where the weight used to be.

Legal speeds eh!!! Heh, gotta admit i never noticed that i'd lost a whole bank of weights off of the Prila, irrespective of speed, until I was lubing the chain. As i turned out it was only .16 out without the weights... Was just throwing it in there...

Don't rule out tyre wear. If the rear has taken more abuse than the front, then the steering geometry has changed and the nose of you bike is riding slightly higher than the rear. All of these things change how the bike rides. I suppose it depends on how sensitive a setup you have on your bike as 7000k's is a lot of riding and tyre wear... Having said that it could be that your back wheel is fed up with your pussy assed riding and is encouraging you to get back over :yes:...