A featherlight lever feel is achieved through a combination of an added glide ring on the piston and sealed ball bearings at the lever blade pivot

See the link under the Links & More Info tab to purchase these (the small silver parts) if you don't already have them

Combining the excellent GP-2 repair kit

we developed the HRc Team™ Sock

Chainring sizes- 32-36T

Pirelli SporTUBE - 48mm - 29 Inch - Presta - 2.1-2.3 Inch PDP|PLP|Brake Rotor Type A featherlight lever feel isThe SporTUBE is the most classic cycling inner butyl tube range, the standard interpretation of the most used air retention system in the worldA complete range with the size and specification for every kind of cyclist and discipline, from road cycling to urban commuting. MODEL SIZE WEIGHT VALVE TYPE VALVE COLOUR MATERIAL COMPATIBILITY SporTUBE 27. 5" x 2. 1 2. 4 200g Presta, 48mm Silver Buty1 Disc and rim brakes