Ultegra 6500 / DA 7700 to 105 5800
 

Hey :thumb:

As a secondary bike (primary one being a Cervelo S3 2014 6800), I own a Trek Pilot 5.0 2007 with Dura Ace 7700 rear derailleur and everything else being Ultegra 6500. It's in pretty good shape, everything shifts and behave smoothly, nothing wrong to say about it.

On the other hand, with my racing team I now have a sponsorship with Cannondale. I could get a SuperSix Evo 105 5800 at 40% off.

I know the SS Evo is different animal, I don't mind the much more agressive frame. I'm instead wondering about the mechanical components themselves. Would I miss my old 7700/6500 groupset?

Thanks!

I have several bikes with 105 components on them, and they have always performed flawlessly.
Differences among those groups would be found in weight and maybe longevity.
YMMV

What condition are the current 7700 & 6500 part in? Given they are 9 speed which has no high end support, and are pushing 20 years old (the 6500 & 7700 don't match the spec for a 2007 bike, more like late 90's early 00's) if you have the option to upgrade cost effectively, would look at it.

The parts are in like new condition, really. No scratch, no functionality degradation, 6000 to 8000 miles and cleaned/oiled every 200 miles. They were acquired new in 2006-2007, but the bike generation itself was revealed in 2004 I think.

So the 105 5800 would behave better?

Sometimes "lower level" parts on one bike may out perform "higher level" parts on another.
Tiny differences in set up can make the difference.

A somewhat different example-
On an old 70's 10 speed I had, (48-36 rings) I had to set the FDER about 5mm higher than "normal" to get good shifting.

Te issue is the old parts are old, granted they are high end, an well built, but when they fail, getting replacements will mean significant downgrading. parts can fail even if they look fine, I was out riding on Wednesday and my 6700 LD shifter failed, had worked fine till then, no indication it was going to go, even this being 10 speed, am looking at replacing vs the cost of upgrading to current 11 speed, as 11 speed has better availability to 10 speed parts.

Question; why not keep both? Is there anything in the contract that says you have to get rid of the Trek if you buy the Cannondale? That way you have the benefits of the newer 11-speed drivetrain and keep your well-loved older ones. N+1 is never a mistake. :)

Hahahaha good question... Simply for financial reasons. I need to keep the Cervelo, and would ideally only have 2 bikes.

Well, if you sell the Trek you will likely get a pittance for it so unless you have serious storage space issues consider keeping it.