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JimLee, I think you have received pretty valid feedback all pointing in the same direction, to make great geometri frame. Though you mention that similar prototype with steep seat-tube angle, have not passed tests. It does move the CG forward, but that is also the point for seated up-hill...

Agree, Just make the seat post angle, actual 77deg 👌and longer seatpost insert with different shock position. For referance Vmg are getting 443mm chainstay w m510 and 29” 🤩

Thank you for a detailed answer. I understand from your reply that the motor type that takes up most space around BB, defines the chainstay, as you often make same frame with different motor types, and of corse tire size. OLI is new to me, interesting option :) The low powered ebikes (35-60NM)...

Dear Jim-lee, From DIY point of view, Bafang is the easiest to buy the whole system from. I would love to see LCES801, for Bafang m800. But on general notes, the chainstay length of your frames is often quiet longer than the average. BR