I "off-road tested" one of our prototype MTBs with a full Euclid group for about a month back in about 1990, and I hated the front and rear shifting under any load from day one, and especially over any ruts and bumps. The biggest issue for me was that the rear derailleur seemed to "auto-shift" into a higher gear when climbing stairs of any size, or when traversing any deep ruts or bumps. Add this to the fact that I also hated the "feel" brake and shift levers, as well as the stopping power of the brakes themselves, and I was just about through caring about the Campy Euclid group at all.

During the second week of dinking around with adjustments of the Campy shifting and brakes however, I chose to swapped the Euclid's brakes out for Magura hydrauric cantilevers (which I loved at first but learned to hate over time due to rim drag and mud blockage), with Shimano Deore XT and Magura M/C brake levers. After a month I quit riding the bike altogether because I wanted to change the front and rear derailleurs and shifters for XT parts and no one else even wanted to ride the bike. I just nixed the Campy group as ill-equipped and poorly designed for a high-end production MTB, and relegated it to the Sante' catagory. It looked good for profiling, but it sucked for get cross country. To tell you the truth, I think we swapped the parts out for use on a New York city bike.

I notice that the Gazelle owner tossed the Campy drivetrain as well except for the crankset which I had no issues with, but cranksets are pretty brain dead simple as long as they were stiff enough. Also, I never rode the Campy rims but I have heard that they were pretty bullet proof, but Campy's fore' was over for me. Pretty looks good, but it doesn't get you back out of the hills

For me, the Campy group is useless for anything but road use and I regard it as a triple chainring version of the Shimano Sante' group, but thats just me. If I found one today at a killer price, I would use it on my commute bike, because it was very "pretty", but I wouldn't ride one off-road.