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Jumpy, unpredictable shifts can be caused by a number of things, but often times one we don't think of is the sleek layer of lubrication between our cables and housing. Shimano is eager to help solve the problem with its SIS SP41 Shift Cable Grease. This light, silicon based grease is easy to apply to your cables, creating a barrier inside of your housing to prevent corrosion, and keep things moving buttery smooth for snappy, precise shifting.