Bicycle Mechanics - cannondale with durac-ace bottom bracket?
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06-09-09, 08:12 PM
OK guys, forgive my ignorance! Recently got a system six cannondale road bike (used). It has dura-ace cranks. Does that mean it also has a dura-ace BB? Or could it be the cannondale SI or BB30? It has the new "exo" style and around the edge is labeled BC1.37x24? Is this dura-ace? Also, I haven't overhauled a new one like this. Any web-site with good info would be appreciated. I assume it's some type of sealed cartridge bearing. Any special tools needed? Thanks in advance for info.
06-09-09, 08:26 PM
If it doesn't have an adapter to take it down to regular english (1.37x24) then it's mos def not BB30. BG30 for the ****ing win. I'm going to asume some sort of shimano cart bb, or more likely 16 nocth ect bb tht takes 16 thingy bb.
Give us a picture.
06-09-09, 09:23 PM
If it looks anything like this..
It should be a shimano bb cup.
I coulda sworn my 105 bb cup had "5600" written on it. If I'm right, a dura ace cup will have "7800" written on it.
The cdale system six bb should look like this:
06-09-09, 09:30 PM
Yup, it's dura-ace. Thanks.
I went to the shimano site and saw the expanded view along with tools needed, and torque specs.
I remember with the older style brackets, you had to really get the fixed cup tight in the frame. I don't know if this was a problem with my specific frame, etc. Is there anything special about installing these "adapters" as they are called, other than following the torque specs?
06-10-09, 11:18 AM
Is there anything special about installing these "adapters" as they are called, other than following the torque specs?
IMO, yes. The first time I installed mine, I tightened one side to spec and then the other. As a result, the bb would make ticking sounds whenever I got out of saddle.
Thus, I installed it again, this time not tightening just one side but instead, tightening each cup about 50 in lb at at time, alternatingly, until each one had reached shimano's torque spec. This has left the bb completely noise free, no matter how hard I sprint or climb out of saddle.
So at least in my experience, it has to be done a particular way.
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