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-   -   Help, my crank is falling apart and i want to replace (https://www.bikeforums.net/bicycle-mechanics/444404-help-my-crank-falling-apart-i-want-replace.html)

drewmk2 07-22-08 10:57 AM

Help, my crank is falling apart and i want to replace
 
Hi all,

I currently have an 07 Cannondale Synapse 2 (click here for more info).

Unfortunately the Truvativ triple crank started coming apart at 350 miles. I had it replaced under warranty.

Guess what? It's falling apart again. This time I want to replace it with an Ultegra double. I know i will have to change the front derailleur since it was a triple before. Do I need any other components? Will my bottom bracket be alright to use?

Thanks in advance.

drewmk2 07-22-08 09:42 PM

Ok, so after further research i see that i will need cranks, new BB, new FD, and new BB cups?

It looks like the 105 shifters are compatible. Can someone confirm my beliefs?

Shall i just get an Ultegra triple instead, so i dont need a new FD?

stevetone 07-23-08 06:53 AM

Just curious...how does a crank fall apart?

awc380 07-23-08 08:52 AM

...hmmm.
Is this like an 'I want a better crank' falling apart?
Or is it disintegrating? Or did an arm snap?

drewmk2 07-23-08 09:33 AM

Its loosening off the spindle, the same way it happened last time. It's def. a crank problem though. The inner threads were wearing off last time. Either way, I'm not going to be satisfied till it's gone :).

stevetone 07-23-08 09:36 AM


Originally Posted by drewmk2 (Post 7116959)
Its loosening off the spindle, the same way it happened last time. It's def. a crank problem though.

Are the insides of the crank hole being rounded out, or is the crank bolt loosening up? Or both?

Edit: Or is it one of those new-fangled bottom brackets that I have no experience with (and should keep quiet)?


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