Originally Posted by Road Fan

It's nearly impossible from those pics to say the gearing is a half-step plus granny or an alpine-plus granny, or what. If you will count out the teeth and publish that, I or someone can tell you if it follows either of those models. both of them have rather specific relationships between the gears and between the fronts and the backs, that try to give you even jumps as you shift your way up throughout the gears, and to eliminate wasted gears - if you have 2x5, you get 10 distinct gear ratios with no duplication, for example.