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Frustrated and starting to get angry now.

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southern andy:

--- Quote from: TwoBobRob on April 24, 2008, 01:51 PM ---When you fitted the back wheel, was there much free play between it and the frame?  If so, you want to space that out with washers so its snug as it slides into the dropouts.

To fit the wheel i have to actually prize  the frame apart, especially now it has some washers on the inside. Since i have put the washers on the inside the chain is no longer rubbing on the frame.

As for the chainring wobble, before you start on that, have a look along the length of your chain. It should run perfectly straight between front and rear sprockets. It you can see any deviation in this, it would suggest the two sprockets are offset, not in line. You'll need to sort that out at the same time you can cure the wobble too.  It might need a little washer or two between the crank arm and sprocket, I had to do this once.  If you're lucky, you'll find the front sprocket is spaced out too far and that is causing the chain to hit the frame.

The chain ring wobble is still there, bloody frustrating. I've taken them apart about twenty times now, i have tried different chain rings and it's still the same. I've looked from the back to front and the chain doesn't run straight. The deviation is suggesting that the front sprocket is out too much, there are no spacers on it apart from that black volcano shaped cover that is covering the sealed bearings. If i remove that, it could be straight but what about crap getting in to the bottom bracket.

The 'tophat' washer previously mentioned can be fitted either way round, so it can act as a spacer too should you need it.   :)

I've only used it the one way so far, i'll try it the other way. cheers for your help.



--- End quote ---

Haro82:

I've got a set of new flights and I tried last week to fit them, what a pain in the arse! I need to go back to try again.  But my chainring was running all over the place as well and I reckon it is because the top hat washer is too big.. i.e. when you push it into the chainring or spider in my case it does not fit flush (it sticks out a bit on the other side), so when you bring the crank arm up to it, it knocks it out of line. I reckon you might need to file it down a bit.

Andy.       

othomas2:
For clicking, keep in mind that the clicking could be your freewheel... I posted this thread and believed initially that it might be the twin pinch cranks...

http://www.radbmx.co.uk/forum/index.php'topic=59994.0

Check that one of the chain links isn't very stiff... usually a case of the chain breaker tightening the links too hard together. I found this was the cause of the notorious chain bobbing on my recent build. Everytime is was passing the chain wheel or freewheel it the link angled is was that locked up. Also you need to leave a certain amount of give in the chain, don't tighten it up too much.

What wheels are you running ?? I've had a clicking noise from skyways... due to cracks in the bearing cups, so something else to consider.

As for the wobble see what part of the rotation it's wobbling and use the washers to compensate... paying particular attention to the smaller support in the right hand crank arm. I had problems with this too.

Washers are also the key for the chain clearance on the rear stays.

Just me little experience... it can be frustrating but totally fixable in the end.

O

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