Chain rubbing back wheel?? oh :no

evo360 · Jul 23, 2009

Guys looks like big problems for me! The chain is making contact with the side wall of the tyre. The chain has worn an inconsistant line around the tyre wall. Im not sure when this started but it looks like very recently judging by the tyres condition. I think maybe on my last ride, I noticed the bike didnt want to tip into left handers quite as easy as usual and it seemed to be putting up a fight and I ran wide a couple of times too.

Whats gone on to cause this? bushes or suspension, or is the geometry out somewhere?

Im meant to be going to the GP on it on sunday, gutted!

Tifa · Jul 23, 2009

2 things:

what size tyre do you have fitted?
is the axle spacer on the l/h side in place?

evo360 · Jul 23, 2009

its a 190, and I dont know about the axle spacer, can you explain to me what i'm looking for?

Cheers

weejock · Jul 23, 2009

if the chain is only contacting with the tyre in one place and not the whole tyre and turning into a bent is diff from before,,,,,quite simple check wheel alignment

evo360 · Jul 23, 2009

It is making contact with the tyre all the way round, sorry I wasnt clear about that!

weejock · Jul 23, 2009

in that case may sound obvious but have you checked chain tension,,,,it maybe slack enough to have side ways movement

Trevallion · Jul 23, 2009

Im with Jock. Is there no way you can tension your chain to take the relevant slack out and make sure the chain adjusters are equal both sides and thus the wheels running true? Check the right hand side adjuster. If its come loose and youre braking hard it might be dragging the wheel across slightly and be causing the tyre to rub on the chain. Also might explain why cornering doesnt feel right. Chain adjustment should be in your manual.

evo360 · Jul 23, 2009

The tension dosent seem to be excessive but I will take any slack out that shouldnt be there and I will assess it again. 25mm movement in the chainis right yeah? Thanks for the advice guys

Tifa · Jul 23, 2009

evo360 said:
I dont know about the axle spacer, can you explain to me what i'm looking for?

Cheers[/QUOT there is a spacer that fits either side of the wheel, it tucks into a dust seal.
if the wheels been off recently, it's not impossible to assemble witout one. this could cause the wheel to slide laterally on the axle shaft.

NJC 1000 R · Jul 23, 2009

It sounds like alignment to me.......run a straight edge either side of the rear to the front and measure the gaps at the front tyre.....this will give you an idea......I would guess from what you have said you will find that the gap on the left hand will be greater than the right!
Also while up on an axle stand manually rotate rear wheel to see the gap between tyre and chain, from what you said, this might vary upon rotation !
Also using both hands check for any play or movement of the wheel from side to side !
This might seem obvious but check your tyre pressure !
Question... How old is the bike ? Maybe worn bushes !
Question...Have you recently had a new tyre fitted ? or is the tyre worn and flatted in the centre section ?
Try these checks......might give us a better idea.

Batfastard · Jul 24, 2009

what make of tyre - 190/50 michelin pilot sports have had this issue before - they are a bit fatter than some 190's

evo360 · Jul 24, 2009

right, the bikes been up on a paddock stand and I have spent about half an hour trying to sort the problem. I have adjusted the chain to the recommended tension and the problem seemed to get worse! I even overadjusted each side individually to see if I could pull the front of the wheel away. overadjusting the off side tensioner helped the situation but was a whole line further back compared to the nearside!

Thanks for all of the advice up to now guys but Im off to my local aprilia dealer in the morning, let them sort it!!!

darren smith · Jul 27, 2009

evo360 said:
right, the bikes been up on a paddock stand and I have spent about half an hour trying to sort the problem. I have adjusted the chain to the recommended tension and the problem seemed to get worse! I even overadjusted each side individually to see if I could pull the front of the wheel away. overadjusting the off side tensioner helped the situation but was a whole line further back compared to the nearside!

Thanks for all of the advice up to now guys but Im off to my local aprilia dealer in the morning, let them sort it!!!

don't rely on the marks on the swinging arm for alignment. measure between the swinging arm bolt and the wheel spindle on both sides, distance should be the same.

Aldo · Jul 27, 2009

darren smith said:
don't rely on the marks on the swinging arm for alignment. measure between the swinging arm bolt and the wheel spindle on both sides, distance should be the same.

To right mate. I put rods through the rear axle and swingarm shafts. The marks on the axle shaft spacers were 1 and 3/4 marks out. I ran this setting for 400 miles, when i checked it, it was spot on with the rods. 1K miles later I had to change the rear tyre. I carefully removed both front and back chain wheels and cleaned them meticulously by hand, being careful not to damage any signs that the chain was pulling at non -allined sprocket. Both (chain wheels) sprockets showed even wear on both sides of the teeth, to be a bit more accurate I then put them on a surface table and measured them properly. I wasn't to far out. I also measured the rollers on the chain from left to right. Guess what, they were ok. Don't get anal about the factory settings. If you want anything done properely get your own hammer and chisel out.
Aldo.

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Chain rubbing back wheel?? oh :no

evo360

Tifa

evo360

weejock

evo360

weejock

Trevallion

evo360

Tifa

NJC 1000 R

Batfastard

evo360

darren smith

Aldo

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