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Cannondale big-ring overshifting(5 posts)

Cannondale big-ring overshifting540nova
Oct 15, 2001 6:24 PM
On my Cannondale r4000si, under full, standing power (as in sprinting), the chain derails onto the outside.
There is no chain rub on the front derailleur, but the whole set seems to have about a 1 or 2mm wobble. I had the dealer replace the set, and the chainrings have been replaced twice, with little help. I suspect either the chainrings are somehow not designed properly, (refering to the ramps) or the BB shell is not square to the frame. The axle may also be out of true. What's strange is the wobble doesn't seem to be enough to cause this.
This last incident, Oct 12 2001, I was sprinting on a slight downhill, firmly in the big ring, when the chain just derailed to the outside, sending me off balance, and crashing to the road. I now have a broken pelvis, and a good amount of road rash.
The dealer is ordering me a new frame, new set, on which he'll install Dura-Ace rings, instead of the Cannondale rings, a new saddle, a new rear derailleur, and a new helmet, all at his cost (or Cannondale's).
It's my understanding that Cannondale has 4 versions of the Hollowgram set, (or possibly just the rings), the first with no marking, the 2nd thru 4th being stamped with MK 1, 2, or 3. Why would they have to make so many running changes?
Has anyone else had this problem?
No..But you are a Truck! (nm)vanzutas
Oct 16, 2001 6:18 AM
No..But you are a Truck! (nm)540nova
Oct 16, 2001 8:37 AM
I don't get it.
Well...vanzutas
Oct 16, 2001 8:48 AM
No means that I have never had that problem, I have never ridden that bike. I only have an old Cannondaale Team Comp that I had when I was 12 (don't ride it anymore).

Your a truck means that the Caad 6 bottom bracket/Crank which I assume you are using is supposed to be the stiffest ever. it sounds to me like you are flexing the hell out of it, and that means that you are as a strong as a truck.

I am surprised you couldn't get all that out of my sentance fragment.

Adam
Well...540nova
Oct 16, 2001 5:27 PM
Thanks for the compliment, but I don't think this is a flex issue. Have you seen the bottom end of a CAAD 6 frame lately? I don't think Marty Nothstein could flex this thing enough to cause it to derail.