Originally Posted by
Andrew R Stewart
With the wider chains and cog to cog spacing that 7 speed systems have the chainline being spot on is a lesser need, than with the current 10+ systems. Still, aiming for the center is a good goal and the minor unavoidable tolerance will be OK.
Not mentioned is the chain drop that has motivated so much 1 by chainring tooth design and cage pivot clutches. Some will leave the ft der on the bike just to act as a guide and help prevent chain drop. Back in the day ring teeth had a higher peak, engaged the chain link deeper, than is current with rings designed to shift (as in a 2 by). So if you plan to just use one of the 2X rings and a rear der without a pivot clutch be aware that you could easily loose a chain at the wrong moment. Andy
thanks. I will be using both my front chainrings, so my FD is not just to keep the chain on but to enable shifting.
Since I've heard terrible things about the Shimano UN300 square taper BB, what are alternatives that last longer than just 500km, if I were to change the BB?