KMC Z51 Chain & Freewheel or Cassette 6 7 8 Speed Bike Bicycle MTB Road Hybrid – Hopkinson Cycles
8 Speed Cassette, 9 Speed Chain, Bike Cassette, Bike Cables Shift and Brake Kit, Bike 9 Speed Groupset, 50T Flywheel Bike Shift Kit, Derailleur Crankset Accessories Set for Modification(32T Chainring) : Amazon.co.uk:
4 Takeaways from the CyclingTips Ultimate Chain Test - Pinkbike