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Join Date: Aug 2009
Location: Berkeley, CA
Posts: 7,248
Bikes: '72 Cilo Pacer, '72 Gitane Gran Tourisme, '72 Peugeot PX10, '73 Speedwell Ti, '74 Peugeot UE-8, '75 Peugeot PR-10L, '80 Colnago Super, '85 De Rosa Pro, '86 Look Equipe 753, '86 Look KG86, '89 Parkpre Team, '90 Parkpre Team MTB, '90 Merlin
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+1 to checking hanger alignment. That was going to be my first suggestion. Also I've found sometimes those claw mounts put the RD/upper jockey wheel quite far from the FW. If you are going from a hanger-mounted Cyclone to a claw-mounted VG-T Luxe, I suspect you also greatly increased the "chain gap" (the distance along the chain from where the chain contacts the cog to where the chain contacts the jockey pulley). Coincidentally, I was experimenting last night with a claw-mounted Vx RD last night and noticed this large chain gap. The greater the chain gap, the more sluggish a RD may feel and may require more overshift since the chain can bend slightly across that chain gap. This could be as much a reason for decline in shifting performance as the shifters.