Technical & Reference Section > Tech and Restoration

Flight crank question

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jezza:
the chainwheel side is fine, but the other side is too close  :-\

DR VINOAH:
oh i see

flights brand  new come with about 5 or 6 spacer washers often lost over the years

all bar 2 of them (i think) are differing thickness

i reckon bored out penny washers would work

saying that i,ve not tried it meself

trial and error best way :daumenhoch:

SaMAlex:
Are you sure you can fit spacers to 400s? 401s and profiles, sure, but aren't 400s on a square tapered spindle? (like a MTB or road bike?). Theyre the ones without a pinch bolt, right?

jezza:
correct, ive tightend it all up and there is about 1mm clearance on the opp side to the chainwheel, would 175's be better?

SaMAlex:
If its the square spindle, with a fixed bearing shoulder on the chainring side then I dont think there is anything you can do. 175s might help a little (have you got a big stash of 400 arms?) but another fix is to put a small dent in the chainstay. It sound drastic but I have done it loads of times (for crank arm clearance and also for chainring clearance). I just put an old tube or bar across the stay and then hit the bar with a hammer, making a nice rounded dent in the frame stay. Some frames even come with this dent pre done.

Another idea is to make new BB cups that seat the chain side bearing further inside the frame (Im guessing they are sealed bearings), moving the whole assy over to the left. This could be a bit of a pain and would only work if you have loads of clearance on the right side.

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