It seems like high power mid-drives are getting more and more popular. Recently i came across those frames from Eastgem:
http://www.eastgem.net/index.html
here a few pics:
"Boxxon" frame is completely made of carbon and the bare frame just weights a bit over 2kg!!
"Gross" frame has a Steel main frame with (the same i guess?) swingarm made of carbon.
The motor they are using is a cyclone 3000W (which i believe is similar in performance to a "BigBlock").
what i really like is the 219 chain drive with the large rear sprocket. the large diameter will keep stress on the chain low and a wide range of reduction chan be achieved. the hightest reduction is about 1:9 (11T front and 100T rear) which should give plenty of torque.
I initially was going to convert a frame by my own to a high power middrive by doing the same as Eastgem did (installing the motor below the swingarm), but now i think i will pick one of these
With the motor on the swingarm there will be a small disadvantage in rear suspension, but it should be a HUGE improvement compared to a hub drive. the weight of the motor sit very close to the pivot point so the inertia should be very low compared with having the weight directly in the middle of the wheel far behind the damper.
http://www.eastgem.net/index.html
here a few pics:
"Boxxon" frame is completely made of carbon and the bare frame just weights a bit over 2kg!!
"Gross" frame has a Steel main frame with (the same i guess?) swingarm made of carbon.
The motor they are using is a cyclone 3000W (which i believe is similar in performance to a "BigBlock").
what i really like is the 219 chain drive with the large rear sprocket. the large diameter will keep stress on the chain low and a wide range of reduction chan be achieved. the hightest reduction is about 1:9 (11T front and 100T rear) which should give plenty of torque.
I initially was going to convert a frame by my own to a high power middrive by doing the same as Eastgem did (installing the motor below the swingarm), but now i think i will pick one of these
With the motor on the swingarm there will be a small disadvantage in rear suspension, but it should be a HUGE improvement compared to a hub drive. the weight of the motor sit very close to the pivot point so the inertia should be very low compared with having the weight directly in the middle of the wheel far behind the damper.