Technical & Reference Section > Tech and Restoration

Bit of a tight spot (in chain)

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sweetbeats:
I will have a look after my tea...it really is starting to drive me nutz this bike..been getting on my ti@s since I started it :LolLolLolLol:

sweetbeats:

--- Quote from: subversion on October 30, 2008, 02:55 PM ---More than likely the chainring & spider on the crank slightly off centre. you can mess about with it to improve things by loosening off the chainwheel bolts & retightening them (without the chain on) & also loosen & retighten the spider on the cranks. Also watch your freewheel whilst cranking the pedals backwards & forwards, is there any 'wobble' in the freewheel at all?

--- End quote ---

Checked freewheel no movement at all :daumenhoch:

Hi lucy where would i put the washer?

moley:
Are you using a reducer/top hat so that the spider fits the spindle?

If you are, was there any play when the spider, top hat and spindle are assembled (before you tighten up)?

If there is then the spider might be slightly off centre!!


Also try loosening off the Chainwheel bolt on your crank arm.  Just to check whether tightening the chainwheel bolt has caused the spider to pull out of alignment.  If it is then you might need a washer between the crank arm and spider where the chainwheel bolt goes through to take up the slack so that when you tighten it it doesn't warp the spider.

If your spider is warped where chainring bolt is attached then it would cause tightening in that area!!

When the Chainring bolt area is off the chain (between the top and bottom of the chain) then it will feel loose!!

And tight when the chainring bolt area is furthest from the Freewheel!!

sweetbeats:
Cheers Fella I will have a muck about with the bolts shortly and see what happens :daumenhoch:

GREMLIN:
When I've had issues like this before I always start with checking the run of the chainring.
I start by removing the chain.
I then use a pen/pencil and hold across the chainstays with the tip next to the edge of the chainring teeth.
Then I turn the cranks and see for sure if there's wobble, or back to front movement showing it's off-center on the spindle.
It doesn't have to be too far out for it to create major slack/tight rotations.

Then I'll put a long straight edge along the chainring and back to the freewheel to see if that's out.

On a couple of builds where I've had this problem I put the chain back on the bike.
Then turn the crank so it's at it's most tight, then undo the chainring bolts.
I then pinch the two sides of chain together and tighten a couple of the bolts.
Spin the cranks a couple of times and see if it's loosened a little.
9 times out of 10 with a bit within 2 or 3 attempts the problem is sooo much better.

Just my tuppence worth   :daumenhoch:   G.

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