http://cgi.ebay.com/SHIMANO-ULTEGRA-...QQcmdZViewItem

I need to replace my crank on my 9spd Trek 5000. Its a Bontrager with an unknown BB. In 500 miles I've already had to tighten the crank arms twice and it doesn't shift how I'd like it to. It also flexs a lot.

I want to put on an Ultegra Crankset w/ BB. I found this great deal on Ebay but it is for a 10spd. Will it be compatible?

Thanks in advance.
-Ryan