I don't know.
Join Date: May 2003
Location: South Meriden, CT
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Bikes: '90 B'stone RB-1, '92 B'stone RB-2, '89 SuperGo Access Comp, '03 Access 69er, '23 Trek 520, '14 Ritchey Road Logic, '09 Kestrel Evoke, '08 Windsor Tourist, '17 Surly Wednesday, '89 Centurion Accordo, '15 CruX, '17 Ridley X-Night, '89 Marinoni
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when I set the upper and lower limits, I get the der. to line up with top and bottom cog no prob. The der. just doesn't seem to have the oomph to pull the chain down that one last cog.
ditto here, Shimano never gave me a problem, and shifted much smoother. the Rival is a bit clunky.