Technical & Reference Section > Tech and Restoration

hmmm, crank problems. again. i hate cranks.

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stoke bloke:
a few more quick ideas . First check your chainring. take the chain off and spin it to checck for dings and dips.
 Iam guessing that that will be ok.  on my profiles the bolt boss that holds the chain ring, not the central crank spindle hole ., has been welded on slightly lower. the result being it puts a slight sway in the chainring when tightened . might be the same on yours.
 check that you have good alignment with the chainring and freewhweel , cassette cog. this is best done by putting the bike upside down on a bench/ table and looking along the chain  at eye level.  use some crank spacers to shift the chainring/ crank arm  in and out along the spindle . give us a shout if you need some more spacers. sometimes you need a few depending on the bike . i think i have a bout 4 or 5 on mine .
 check that your rear end is straight and not twisted . I once had a haro sport that was  a bit twisted . i had the bike from newso it had been welded that way and the back wheel was always a pain to set up.

 having done all of the above , use  1 or , if the problem is still there 2 good quality chain tensioners. also , if needed use some good quality washers to close up any big gaps between the frame and cone / sindle axle  hardware. set the back wheel up with the tensioners . tighten everything up and don't mess with it.

 my back wheel is the same  , but it is ok once set up.
 
 phil did you grind the drop outs from 10 to 14mm, if so this might be a problem area  with the wheel not sitting straight.

 the problem might also be with your chain. i wiould check with another chain from one of your other bikes . they sometimes stretch or develop tight spots. you can't beat a shiny , clean new chain.

harris:
chuck on another wheel  or chainwheel that is good  pain i no but best way to find prob.

huffy:
try a new split link on chain

i had a similar prob and found out the link was to blame for my tight spot

so i had a good used one and that cured my prob

cheers  russ :4_17_5:

Sanmarcopizza:
Have you tried a new chain on it. Knowing the powerhouse that you are, you may have stretched the links when snapping out of the gate. LOL

oberonspacefruit:
its a brand new chain.

every component is brand new. thanks for all your comments tho guys.

its not a tight spot, its a tight 2 inches....

it honestly seems like the hole in the chainring is out of kilter, making the chain stretch when it gets to the part of the revolution where it would be most off centre...

i think the spacers may be wrong, but would this make it tight a one point or all of it?

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