Originally Posted by
Jipe
The problem is that you cannot mount a chainring bigger than 55t or maybe 56t on the current Birdy models with the current chain tensionning arm. So the only solution to have longer gears is either a smaller than11t cog or an internal gear hub.
The original tensioner should be one of the first things you get rid of when you get your bike. I bought an aftermarket tensioner which mounts to the bottom bracket, it is spring-loaded and supports the chain better. I can turn the tensioner on the bottom bracket to give more clearance if I use a larger chainring.