Shimano XTR Di2 synchro shift

Shimano have lifted the lid on their new XTR Di2 electronic shifting system for mountain bikes. One of the neatest aspects of the system is that it allows the use of multiple chain rings with just a single shifter using the Synchro Shift mode. In this mode, a user can pre-program the shift points for the chain rings - for example, a user can set the system to only shift from the big to the middle chain ring once the lowest gear on the cassette has been reached. It’s all completely customisable. For more inf