Originally Posted by
colotandem
We currently run 53-42-30. I was thinking about trying the 39 middle... I like USPSPRO's idea of the 39-28 middle & low rings...
I'll investigage the TA rings and maybe the Shimano stuff too.
If you are to have a 39 middle, then Shimano would seem to be the thing, since that the size they have and their chainrings have the best shifting reputation. You could match that with the Shimano 52 outer, and maybe a TA 28t low ring.
Though I think the Praxis is the bee's nees, it wouldn't be the good for the 39t middle,
as its 130 BCD comes only in a 53t, and the 14t jump from 39 to 53t is a stretch.
Come to think of it, that really says something about the Praxis. The shift from the 42t middle ring is better on my
53t Praxis, than it was on either my
52t Shimano or TA chainrings.