Bike Forums - View Single Post - Chain Length calculation?

07-01-22 | 07:23 PM

#33

smd4

Senior Member

Joined: Dec 2020

Posts: 7,002

Likes: 3,851

From: Wake Forest, NC

Bikes: 1989 Cinelli Supercorsa

Quote:

Originally Posted by SoSmellyAir

I have a Shimano RD-5800-GS. This is the dealer manual: DM-RD0003-09-ENG.pdf (shimano.com)

I am familiar with the diagram you are referring to, which is on page 8, right column "Assemble with sprocket max 27T or less".

With a 12-25 cassette, I have the B screw all the way out, to minimize the gap between the guide pulley and the big cog.

Thanks. So contrary to your previous post, you are running everything within spec. The B adjuster should have zero effect on your derailleur cage angle if set up correctly with chain on large ring, small cog.

I run my B screw all the way out too.

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