Ok, 'reference' build. 2011 Intense 951, 83mm BB. All the production parts, production processes, ready to go.
This uses the 20t/32t sprockets previously discussed. These plates were designed for the 16t/24t combo which would have put the idler wheel up higher (will add a few mm's to the mount and another link in the chain to give it a touch more slack). The motor uses the outer sprocket position, inner is now derailleur. The spider mounts on the inside flange of the crank freewheel and we can also replace the motor 32t with the 24t by using a different spider (20t motor -> 24t crank, this would be better for a singlespeed setup).
The Talon ESC is sandwiched under the gold heat sink, 8 screws pulling it against the flat back of the controller. The heatsink (actually two identical heat sinks lined up) comes with a layer of cool phase change heat transfer material to bridge the gaps (Chomerics T766). Imagine the kit/bike a dark color.
Mounting is the same, two plates around the BB with a metal strap over the downtube. These mounts can also be used in a pull configuration (inside the frame triangle) by moving the straps to the bottom side- the other pair of mount positions is just in front of the chain tensioner pivot. Which by the way is spring loaded, bearing mounted and jockey wheeled.
The bike is set up with an 11spd derailleur, 3 smallest cogs removed leaving a 42-15t range. The DH frame skews the chainline outboard relative to a normal 11spd frame and I don't want to apply full power to less than a 15t, so the cassette is shifted outboard 3 gears. No problems with any gear under full power, straight chain is dead center of the cassette. The 3220 3turn is 225kV, 52V nominal battery, 20:1 Tangent gearbox gives 375 crank RPM, 32t front chainring to 15t rear is 800 wheel RPM, so 60mph calculated. Plenty. You can hear the wobbly wheels on the bike in the video below, 40mph on the radar sign and the CA read 3kW in top gear and is fast enough for this old sled around my neighborhood. 50mph is well within reach.
Last edited by tangentdave
on Jan 11, 2018 10:36 pm, edited 3 times in total.