Hello all,

I have a Birdy 9-speed disc brake model and would like to upgrade it for both lighter weight and performance.

Can I replace the current brake lever and shifter to Shimano ST-M975? I realize I have to change the brake and possibly even the rotor but would the shifter works with the current derailleur?

Also how would you compare the Birdy disc brake and the Shimano disc brake? Would there be any significant advantages to switch to Shimano?

Thanks all for your help.