I have used larger pulleys from low end Shimano RDs (think Tourney) to increase chain wrap a link or two. Let me run a 11-32 cluster with a 53-39 front.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)