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Extra Cog 42T full CNC :
The kit includes :
An extra 42T full CNC cog which compensates for the removal of the small ring, has Aluminium 6066 stars and crown in 7075 and provides excellent rigidity for such a low weight!
The 16T CrMo steel cog ED black finish replaces the 15 and 17 teeth.
The specific B-tension screw optimises the derailleur adjustment to accept the 42T cog.
Kit weight: 86g
SHIMANO cassette compatible.