Technical & Reference Section > Tech and Restoration

hmmm, crank problems. again. i hate cranks.

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oberonspacefruit:
so. i have a frame. american sealed bb, put in at the factory.

newschool redline cranks. tuffneck chainwheel, also brand new.

so why, when i turn the crank, does the chain become tighter at a certain point?

you would think that the chainring was off centre, but its got the top hat washer on it, and as i said its brand new.

and at the other end its a brand new cassette hub.

how can it be doing this?

im going to try another sprocket to see if that helps.

harris:
these are only could be ideas crank and sprocket out of line
hub set in wheel out of line wheel could look straight but hub on the scew
bent chain ring or chain wheel
rear end bent im only guessin mate just puttin ideas to check.

diesel:
Try this:

Draw a perfect circle the same size as your chainring, then pop your chainring over to see if it is perfectly round? Some where actual designed slightly oval.

If its not this then double check that you have it positioned correctly on the spider / power disk?

If however its a one piece chainring - ignor everything I have just typed! ;D

oberonspacefruit:
rear end shouldnt be bent, its a new frame.
i suppose it may be hub out of line, ive re spoked it myself, but at the end of the day, even if you took the rim and spokes off, the hub should theoretically in the same place?

if the crank and sprocket where out of line , would it be tight all the time?

this one is loose for 3/4 of the chain then suddennly tight, which is why i thought it was chainring related, but i dont know.

oberonspacefruit:

--- Quote from: diesel on June 19, 2006, 09:53 AM ---Try this:

Draw a perfect circle the same size as your chainring, then pop your chainring over to see if it is perfectly round? Some where actual designed slightly oval.

If its not this then double check that you have it positioned correctly on the spider / power disk?

If however its a one piece chainring - ignor everything I have just typed! ;D

--- End quote ---

lol, yeah its a one piece tuffneck. redline crosstype...surely a new one should be ok.and theres only one way to fit it on the top hat washer. and theres only one way for that to go on the crank spindle...

i could understand horizontal misalignment, but not vertical.....

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