Shimano 105 10 speed
Comments
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There are 2 different sensor kits with different sized connectors. If you check the Shimano website you might be able to find the kit that you need for your shifters.
I've got 10 speed himano 105 levers and had to buy the SM-SC70 sensor kit which fitted fine. Sound like you've got the SC-6501 kit which is for 9-speed I think. Easy mistake to make though as the boxes only seemed to list older model numbers on the back. I had the same problem as you when the bike shop sent me the wrong sensor kit for my shifters.0