Rear mech shifting issue
I replaced the cassette, chain and rear mech(shimano Tiagra) on my winter bike which s a Giant SCR 2 circa 2006 and indexing the gears has been a problem. When I put it on the bike stand and use the barrel adjuster on the mech to index, I just can't get it to shift up and down the gears perfectly. I am able to get it to shift up and down through the first few gears, but then it gives me issues with the bigger gears. I can get it to shift well moving down the block, but then it gives me problems moving back up. I have no idea what to try next. Anyone got any ideas ?