|Italian Record Bottom Bracket and Crank||BD6|
Mar 16, 2003 2:25 PM
|I have a Campy Record BB and Crank on my C40 and the BB worked its way out on a ride today - I couldn't shift into the big ring and had to ride at snails pace home. Does anyone have a recommendation as to how I can prevent this in the future? Is this a standard problem? Thanks for the help.|
|re: Italian Record Bottom Bracket and Crank||Rusty Coggs|
Mar 16, 2003 2:39 PM
|it's the much disparaged Italian curse, self loosening BB threading.Had it happen twice myself.Now I tighten them extra tight with nothing but grease on threads,and no more problems.Sorry I don't have a torque spec for extra tight.|
|re: Italian Record Bottom Bracket and Crank||mackgoo|
Mar 16, 2003 2:49 PM
|Tourqe to spec.|
|Torque to spec. - RIGHT ON!||Kerry|
Mar 16, 2003 5:43 PM
|Unless you actually used a torque wrench and set it to 70 nm, there's little chance you got it tight enough. 70 nm is really leaning on a 16 inch/40 cm long wrench handle. I rode an Italian BB (cup and cone days) for 90K miles and only had it come loose once - not whacking hard enough on the wrench to tighten it during winter overhaul.|
|re: Italian Record Bottom Bracket and Crank||DaveG|
Mar 16, 2003 3:00 PM
|I went through this last year when I installed a italian Centaur BB on my Torelli. My final solution was two turns of plumber's Teflon tape around the BB threads and then torque to spec. You can find the spec online at Campy but I remember being shocked at my much force I had to apply to get there.|
Mar 16, 2003 3:45 PM
|Yes, Italian threading wants to unscrew with pedalling action. This is very common with Italian threading, which is also why it is avoided in almost every other manufacturer's bb shell.
The teflon tape sounds like a good idea, just don't use anything like locktite that will hold it so well you'll never get it back out!
Mar 16, 2003 4:49 PM
|I've worked in a shop for a number of years and my recommendation for *all* bottom brackets is to make them bloody tight! Grease (or anti-sieze where appropriate) will also help.
How tight is bloody tight? That sorta depends on the person, their strength and level of paranoia. Firm is good, but don't use your bodyweight; removal should be possible...
Generally, something about 300mm long should enable you to get the thing tight enough, but one guy I worked with liked to use a 1m(!) lever on Shimano cartridge BB's. They never came loose, but getting them out...
|re: Italian Record Bottom Bracket and Crank||Live Steam|
Mar 16, 2003 5:41 PM
|I had this happen on my Colnago on a really hilly ride in Altoona, PA. I make it a practice to put "blue" threadlock on the threads of all of my BB - Italian or English. Never had it occur again and the blue stuff is not permanent. You can remove the BB when necessary with a little "elbow grease".|
|re: Italian Record Bottom Bracket and Crank||rogue_CT1|
Mar 16, 2003 10:42 PM
|Happened twice on my Colnago CT-1 when I first got it. Just tighten it down good and tight and it will stay put for a while. I think there was too much anti-seize on the threads when first assembled.|
|re: Italian Record Bottom Bracket and Crank||russw19|
Mar 16, 2003 11:42 PM
|I still often giggle that Italian bike companies make Italian threaded bottom brackets, yet Campy still makes the drive side pedal reverse thread on their cranks. You would think eventually they would catch on.
Oh, and I not knocking Italian bikes, both my road bikes are Italian.
Mar 17, 2003 7:23 AM
|Some use loctite, but personally I wouldn't use it on a BB. Especially a pricey frame like a C-40. Just put some teflon tape on and retighten. Keep checking torque regularly.|
|Never had this problem...||C-40|
Mar 17, 2003 8:06 AM
|I've been using Italian BBs since '95 and never had this problem. With the new cartridge style BBs, torqueing to spec should eliminate the problem. In the old days of lockrings, getting enough torque was a problem.
The idea that the right hand thread results in the BB coming loose is nonsense. It may have a tendency to unscrew AFTER it has come loose, but the RH threads don't cause it to come loose.
|As I said before "blue" liquid thread lock!||Live Steam|
Mar 17, 2003 8:23 AM
|There is no substitute. This is what is used on professionally assmebled bikes, not teflon tape. Blue liquid thread lock is removable, yet secure. It is easy to apply too. Start to thread the cup into the BB and then add a few drops and tighten and forget about it. I have never tried to put enough torque on a BB cup as per the recommendations. I wouldn't want to risk cracking something.|| |