What is the difference between KMC Z6 and KMC Z7 for 6 speed cassete?
On KMC site, both of them appear to be suitable for 6 speed bike.
KMC Z7: https://www.chainreactioncycles.com/il/en/kmc-z7-7-speed-chain/rp-prod51830
KMC Z6: https://www.chainreactioncycles.com/il/en/kmc-z6-6-speed-chain/rp-prod193013