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I got 6 B1s delivered the other day.
Given that I had to use one today to replace the two rides old Miche track chain which I’d fitted to my new build as it had stretched/worn to the point of being derail-able then I guess they are going to have an easy job of impressing me.
Even with the limited size of the bit of chain I removed when fitting the B1 (about ½ a dozen links) there was a discernible difference in the length when compared to the Miche.
M_V
@Alexnharvey
have been using b1s chains for several years because they are bushed. Unfortunately the pins and bushes are not hardened much, unlike higher end chains. I don't keep any records of how long they last and I use two or three in rotation, putoline waxed, sometimes introducing a new chain if I've used one on another bike or sold a bike etc. I take them out of the rotation if they get to 0.75% on an inaccurate park checker. When the current ones all get to .75 I'll just run that drivetrain until something breaks.
So, don't know how they compare to a Z1 but they are very cheap. Unfortunately I think there's not a slightly better bushed chain for 50% more money you have to pay double or triple but do they last two or three times as long?