I followed the park tools instruction on adjusting the b-screw. I can back the entire b-screw out without the upper jockey wheel rubbing the innermost cog (23T out of my 12-23 10 speed). The rear derailleur is a dura-ace if that matters.

Is it wise to run without a B-screw?

Wow, you just save 8 grams!! :-)

I followed the park tools instruction on adjusting the b-screw. I can back the entire b-screw out without the upper jockey wheel rubbing the innermost cog (23T out of my 12-23 10 speed). The rear derailleur is a dura-ace if that matters.

Is it wise to run without a B-screw?

If your setup works fine with the B-screw all the way out, then you don't need it. However, just because the upper pulley is not hitting the cog doesn't mean the derailleur is in the optimum position, so you should try some different settings and see if things improve. And if, after that experimentation, your decide you don't need the B-screw, why on earth would you discard it? You may well need it for a different setup in the future, or whoever you sell it to may need it.

If your setup works fine with the B-screw all the way out, then you don't need it. However, just because the upper pulley is not hitting the cog doesn't mean the derailleur is in the optimum position, so you should try some different settings and see if things improve. And if, after that experimentation, your decide you don't need the B-screw, why on earth would you discard it? You may well need it for a different setup in the future, or whoever you sell it to may need it.


Kerry,
Thanks for the advice! I did try the bscrew at different positions. The further I screw it down the further the top pulley gets away from the innermost cog. Is there an optimal distance (inches or mm) that the top pulley should be away from the innermost cog? The park tools website just says adjust for clearance. Right now with the b-screw backed all the way out there is about 5 to 6 mm of clearance (or about 1/8" clearance). I would indeed keep the bscrew in the safe place so I can use it on other bikes later on.

Android,
The screw is made out of aluminum it weighs less than 0.5grams it doesn't even show up on my scales.

Is there an optimal distance (inches or mm) that the top pulley should be away from the innermost cog? The park tools website just says adjust for clearance.

There is an optimum distance, but it is specific to each setup, and the optimum may be quite broad. It's not just about having clearance. Shifting performance many be affected in somewhat unpredictable ways. All you can do is try some different settings (on the road, not just in the work stand) and see what happens.