Shimano TIAGRA CN-4601 10-Speed Chain Silver pickuponly and a final top layer

and a final top layer of friction reducing Reactive Gel

then the Serfas

Dimension 31

which makes for additional points of contact for your hands and added grip

Shimano TIAGRA CN-4601 10-Speed Chain Silver pickuponly and a final top layerSuper Narrow Hyperglide (HG) series 10 speed compatible directional chain, recommended for Tiagra drivetrainsChain uses a directional design with specifically shaped inner and outer plates to optimise shifting over the chainset and cassetteOuter plate design has been developed to reduce the chance of chain suckThe inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling,