In readiness for the probable collection on N+1, in Feb, {a bent}, how does one assess the correct chain length. I'm 6'2", but the seller is 5'8", and the chain has been shortened. Now, obviously the boom will need to be extended, although I 'Think' I may prefer a slightly bent knee, rather than a fully stretched knee, but how to calculate how many extra links. Chain has only done about 2k (miles) ish, so extra links with an extra quick link is correct...oui?...rather than a new chain (s). But how many, is there a rule of thumb,ie middle sprocket, middle cog, rear mech hanging straight down? is it guess work, ? Now assuming 6" difference in height between us, do you halve this and add 3" of chain?
I'm thinking too much I know, but that's just me.