Thread started by sciencefriction at 03.12.09 - 12:31 pm

so please forgive my ignorance, but i'm looking for some first-hand guidance from people who ride fixed.
my left crank fell off this morning as i was biking to work. luckily, i was able to bike off to the side before the bus behind me ran me over.

anyways, i took apart and put my crank back together at one of the co-ops about 4-5 months ago because of some creaking i was hearing. we greased everything when we put it back together (pedals-crank, crank-bottombracket). the creaking was gone and i was pretty sure we put the cranks on really tight. anyways, the left crank fell out today, my bolt doesn't look stripped, so i figure it must have gradually worked its way out as a function of the backwards resistance from riding fixed. so my questions are:
- how often if at all should you have to retighten and check the bolt that connects the crank arm to the bottom bracket?
- does anyone recommend using loctite instead of grease when putting it back on?

thanks.

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- how often if at all should you have to retighten and check the bolt that connects the crank arm to the bottom bracket? you should check it before you ride everytime

i used jb weld to fix my rear cog to the hub. 4 months so far so good.



mattspeed
03.12.09 - 12:34 pm

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thanks mattspeed, this experience has taught me to check it regularly now.
but do you use jb weld on the crank/bottombracket/bolt connection?



sciencefriction
03.12.09 - 1:01 pm

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AHHHHH!!!! JB WELD???!!

Are people fucking idiots? Tighten your lockring. JB Weld has no place on a bike.

Install your cranks properly the first time, and check the bolts every so often, not every fucking ride.

However, if your crank has already worked its way loose, its taper could be damaged and now you WILL have to check it every ride, if you don't just replace it.

Please read this






zombiefiesta
03.12.09 - 1:14 pm

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Also it's fine to use loctite on the crank bolt, but make sure to use grease on the actual tapered spindle.



zombiefiesta
03.12.09 - 1:17 pm

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my hub was stripped :/ my other choice was to buy a new wheel. not recommended but, if you do it right it works.



mattspeed
03.12.09 - 1:20 pm

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is your bottom bracket spindle male threaded and it accepts a nut? or is it female threaded and accepts a bolt? The male threaded/nut combo is found on cheaper bicycles and i've heard that they should not be used for fixed gear applications because the nut can work loose.

anyone else have experience with this? if you do have this type of bottom bracket, then this is probably exactly why they say not to use it for fixed gear...



cassidy
03.12.09 - 1:23 pm

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thanks zombie. i thought i checked sheldon, but i guess i didn't find the articles by brandt. looks like he has other good articles i can check out.
thanks.
cassidy- i have a bolt to accepting bottom bracket spindle set-up, so i think that is pretty standard if that's what you're saying.
thanks all.



sciencefriction
03.12.09 - 1:35 pm

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The fuck you say! A little JB weld is good for your system. Don't knock it.



Joe Borfo
03.12.09 - 1:42 pm

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- JB Weld
+ Loctite



User1
03.12.09 - 2:45 pm

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epoxy glue to hold your cog to the hub?! wtf



Gav
03.12.09 - 3:49 pm

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+1 to zombie. Loctite on the crank bolt threads, lotsa grease everywhere else. Don't forget top of the saddle and bottoms of the shues.



supersano
03.12.09 - 4:02 pm

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i read somewhere that you shouldn't put any grease on the crank/spindle part because the aluminum already comes coated with some stuff on it.



666
03.12.09 - 4:19 pm

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screw this messageboard. go to a bike shop.



ruinedbyidiots
03.12.09 - 4:23 pm

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jb weld = bomb proof.



mattspeed
03.12.09 - 4:24 pm

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_iJunes
03.12.09 - 4:45 pm

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I don't care how much trust you have in epoxy glue, it's just another version of a suicide hub if your hub's thread is stripped, as you said.



Gav
03.12.09 - 5:47 pm

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