What type of front derailleur mount is this and what's the maximum chainring size?

[synchronicity]

 

[mdvineng]

Judging by the picture, max is what you have already.

 

[ishaw]

Looks like an e-type mech. Fits on the BB and a bolt on the frame.

 

[novocaine]

^ what he said.
remove it, take and aim and..... straight in the fuckit bucket. Shimano and their silly ideas.

 

[clubby]

Shimano and their silly ideas.

Exactly. 1x rules!

 

[synchronicity]

Judging by the picture, max is what you have already.

Oh.
Thanks.