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D/A Crank Bolt on the Loose?(4 posts)

D/A Crank Bolt on the Loose?Fred2000
Apr 1, 2002 8:44 AM
I just installed a Dura Ace crank with an Ultegra BB (Both new and Splined). It was installed correctly by my LBS. It seems the bolt loosens after a short while riding, to the tune of maybe a quarter turn after about 10-15 minutes of rolling hills. I tighten it back up gently but firmly (with a allen wrench on my multi-tool) but it loosened back up.

I am sorry if this question has been asked before but is there any good solution out ther except stopping and tightening.

I don't know if it make a difference but I am 265# so I am putting a lot of weight on it.

Thanks for the help, Jon
re: D/A Crank Bolt on the Loose?TJeanloz
Apr 1, 2002 8:54 AM
No multi-tool allen wrench is going to get the crank bolt to 50nM- the torque spec. And it is VERY important to torque cranks to spec. Get yourself a large allen wrench, or preferably a torque wrench, and crank down the bolts properly. They should not come loose if they are appropriately torque, but almost certainly will if they are under spec.
Cheap wayKEN2
Apr 1, 2002 11:47 AM
If you don't want to go to a torque wrench, or even long allen wrench, the cheap way is to use a shorty allen wrench (might even work with your multi tool, depending on how it's attached) and put a cheater bar over it. I use an old seatpost. Just slip the post hole over the wrench--it gives you more leverage.
re: D/A Crank Bolt on the Loose?Jekyll
Apr 1, 2002 9:42 AM
TJeanloz is right on as usual. The other thing is that if you keep letting your crank arms come lose you will destroy the splines inside the crank arms making them impossible to properly tighten and unusable.