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Campy Ergos on Ultegra bike?(9 posts)

Campy Ergos on Ultegra bike?Andante
Jul 1, 2002 9:40 AM
My wife had a Chorus bike that was totaled, and I stole her componet group. Her new bike came with full Ultegra, but she hates the STI's. Can I throw a pair of Ergos on there and expect no problems with shifting? The Ultegra is 3X9 and I would put 3X9 shifters (Chorus) on it. Thanks!!
re: Campy Ergos on Ultegra bike?Andy M-S
Jul 1, 2002 12:54 PM
I haven't done this, but I have friends who have: Use the Campy shifters AND REAR DERAILER with an otherwise Shimano drive train and things should work very well.

I know people who claim this works better than a full Campy drive train...
re: Campy Ergos on Ultegra bike?Old_school_nik
Jul 1, 2002 1:36 PM
I run Ultegra brake calipers with Chorus 10 lever w/ no problems - don't know about drivetrain.
accurate information...C-40
Jul 1, 2002 2:25 PM
The campy 9 ergo levers will not properly operate a shimano 9 derailleur. You can get reasonable, but not perfect shifting using the campy shifters and rear derailleur, but it certainly won't work as well as it would with a campy cassette.

Shimano cog spacing is 4.32mm. Campy cog spacing is 4.55mm. The difference is 5%. The best shifting that you can get requires the rear derailleur to be aligned as closely as possible on the center cog, to distribute the derailleur positioning error equally between up shifts and down shifts. The accumulative error will still be 20% in both directions, on the 4th shift. A better solution is to buy a Wheels Manufacturing " accellerator" cassette from excel sports, which has the proper spacing ($100) or stick with all campy parts.
'sort of' accurate information...jimPz
Jul 2, 2002 8:16 AM
The 5% error is NOT cummlative., if it was 20 % in each direction, can you imagine a Campy cassette body 40% wider. it stays a 5% error.
Ex. if you get a 5% weekly raise, at the end of the year do you have a 260% raise (52 weeks time 5%) no, it's still 5%
>currently ride A Pinarrello Prince w/ Campy 9 speed. I have 2 sets of wheels, Campy Eurus & Mavic Heliums w/ a Shmano Casette. I interchange them w/ no problems.

RE: 'sort of' accurate information...igorn
Jul 2, 2002 8:51 AM
I must agree with jimPz. Error in % is NOT cumulative. Look at the picture, and everything will be clear. On 4th shift difference/error is about 1mm. I don't think it could be realy noticable (except you are pro rider)...
you've proved my point...C-40
Jul 2, 2002 9:06 AM
The error is obviously accumulative, as shown by your illustration. The error on one shift is .23mm. Four times .23mm is .92mm or "about 1mm", as you noted.

.92/4.32 is 21% off location, not 5%. This is a substantial amount, and it's the best that it can get.

I don't know how much more simply I can explain this.

Let's try grade school stuff. If you went on a trip that was 432 miles long (one shift) and ran out of gas 92 miles short of your destination, what percentage of the trip did you fail to make? The answer is 92/432 or 21%.
YOU ARE WRONG!!!!.....C-40
Jul 2, 2002 8:54 AM
The 5% error that you refer top is the percentage of the total travel of the rear derailleur, which is IRRELEVANT.

What is important is the relation of the rear derailleur pulley to the cog that it is supposed to be in-line with. If you adjust the derailleur to be perfectly centered on the middle cog, a campy rear derailleur will overshift by .23mm EACH time a shift is made. After four shifts the derailleur will have moved 18.2mm, which is .92mm further than the 17.28mm distance to the fourth shimano cog. To calculate the positioning error, divide .92 by the 4.32mm required to make one shift. .92/4.32 is 21%, not 5%!!!

If you were to adjust the derailleur in the normal fashion, centering on the first cog, the error would be TWICE as much. The shifting would get crappy real quick, with the derailleur pulley ending up almost half of a shift (1.84mm) BEYOND the 9th cog.
RE: YOU ARE WRONG!!!!.....igorn
Jul 2, 2002 9:18 AM
You are right as we are :)))) It is only problem in terms... Total travel error IS 5%. POSITIONING error in 4th shift as you mentioned IS 21%.
Personaly, I think that component mixing is not a good idea, but if it is must, then adjusting derailleur on inner (in this case 5th) cog, could work (almost :)) fine...
Adjusting derailleur in normal fashion, centering on the first cog, is definitely bad idea.