Bicycle Mechanics - Campagnolo Rear Derailleur B screw woe

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Yangster
02-23-11, 03:39 AM
Hi,

I am using a 10speed campy centaur rear derailleur. I tried tuning my the rear derailleur B screw. When i tighten the b screw, the upper jockey wheel is near to the largest rear cog but not rubbing which I read is the correct way. However when compared to when i loosen the b screw, the upper jockey wheel is much further away from the largest rear cog, the pedalling feels abit more rougher but have a more solid feel.

Summary
B screw loosen - very smooth crank movement - upper jockey wheel further from largest rear cog
B screw tighten - not as smooth crank movement but more solid, change gear faster - upper jockey wheel near but not rubbing largest rear cog


Which should be the correct way?


HillRider
02-23-11, 06:44 AM
If the crank feel isn't smooth, the jockey pulley may indeed be touching one of the cogs under load.

operator
02-23-11, 02:20 PM
B-screw adjustment for campy is close as possible in small ring/large cog combo without rub, when shifted into the largest cog from the 2nd largest.