Campagnolo Chorus rear Derailleurs:
- Campagnolo Chorus and Record rear derailleurs are almost identical. Chorus differs by using a stainless steel cable anchor bolt, a chromed steed frame hanger bolt and an aluminum alloy face plate for its pulley wheel cage. Like Record, it provides fast and responsive shifting on two and three chain ring drivetrains.
- Both the two and three ring Chorus rear derailleurs use a polished, silver anodized body, a stainless steel cable anchor bolt, a chromed steel frame hanger bolt, a removable carbon fiber body face plate and a full aluminum alloy pulley wheel cage and main derailleur body.
- The two ring or short cage Chorus rear derailleur tips the scales at a mere 202 grams while the medium cage model comes in at just 205 grams. The longest cage or three chain ring model weighs 217 grams.
- The short cage model is most commonly used for two chain ring drive trains. The medium cage can be employed with two or three chain ring drivetrains while the longest cage is almost always used for three chain ring drivetrains. The distance from the center of the top pulley wheel bolt to the bottom pulley wheel bolt is:
Short cage is 55mm, medium cage equals 72.5mm and the long cage is 89mm.>
- Confused as to what length rear derailleur cage you need? See our easy to understand sidebar "Rear Derailleur Cage length explained..." by clicking on the underlined text.
- Both the two and three chain ring Chorus rear derailleurs are designed to shift with Campagnolo 8, 9 or 10 speed drive trains. We recommend replacing the pulley wheels with wider, 8.8mm nine speed ones, to accommodate 9 speed chains. As long as you use a 9 speed chain and 9 speed pulley wheels, you may use this rear derailleur on an 8 speed Campagnolo drive train. It will shift fine with 8 speed Ergo, downtube or bar end levers. The existing pulley wheel bolts will accept both 9 and 10 speed pulley wheels.
- For just $10.00 we can convert any new 10 speed rear derailleur, at the time of purchase, to 9 speed. $10.00 covers the labor only; we keep the 10 speed pulley wheels while giving you the wider, 9 speed ones.
We do not recommend using 9 speed chains with 10 speed pulley wheels. The chain will hit the inside pulley wheel cage plates causing excess wear and noise.
Ten speed pulley wheels are 8.4 mm wide and have tiny "C10" letters stamped on the steel end caps. Nine speed pulley wheels have plain end caps and are 8.8mm wide. The actual plastic toothed wheels are the same for 9 and 10 speed; only the end caps and internal bushings are different.
- The upper pulley wheel has built in side to side play to help with indexing. The lower pulley wheel has no play and should be installed with the lettering facing away from your bicycle's frame. We suggest removing, cleaning and lubricating the pulley wheels every 1500 miles or once a year. They should be replaced every 5000 to 8000 miles.
- The short and medium length cage assemblies are interchangeable so you may use this rear derailleur on another bicycle drive train. The long cage only fits the long cage rear derailleur.
- In 2001 Campagnolo changed the geometry of their 9 speed rear derailleur. Current Campagnolo 9 or 10 speed rear derailleurs will NOT work with pre-2001 Ergo levers unless you upgrade the internal Ergo Index Gear to a current 9 speed model. If you do upgrade, you will be rewarded with quicker and more precise shifting. 2001 to current, 9 speed rear derailleurs, can easily be upgraded to 10 speed by simply replacing the 9 speed pulley wheels with 10 speed ones.
- Pre-2001 nine speed rear derailleurs have a "B" adjusting screw located on the derailleur hanger tab next to the frame hanger mounting bolt. The "B" adjusting screw butts against your frame's rear dropout and allows you to adjust the angle of the derailleur body. 2001 to current 9 and 10 speed rear derailleurs have the "B" adjusting screw located at the junction of the derailleur body and pulley wheel cage.
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