*speed internal with a double front?

[bikebum1975]

Hey Guys

I'm toying with an idea for my Panasonic bike it's currently a 12 speeder but I wanna drop it to an 8 speed Sturmey Archer coaster brake hub I have a 27 inch wheel that I wanna try rebuilding when I get it but my question I was wondering would it work with double crank? Would it give anymore gearing I think it's a 50 tooth for the biggest ring from the research I done on it still gotta actually sit done and count the teeth but wondering if worth it to change it out? Lemme know what y'all think or would it be a waste of time with the double? Also planning to add if possible a Sturmey dyno/drum brake hub to the front I wanna loose the rim brakes on the bike. Any thoughts?
Thanks
Jim

 

[X-RAY]

id count the teeth and do the math first to see if makes enough difference to be worth trying.could save some disapointment, i dont know. not sure how the coaster will like the front shifting either. its an interesting concept, though.

 

[deorman]

The coaster brake will be completely undependable with the chain slack needed for a multi-sprocket crank.

 

[bikebum1975]

The coaster brake will be completely undependable with the chain slack needed for a multi-sprocket crank.

Thanks had a hunch wasn't sure