McKitterick
1 mW
Updating a bit: So my Tangent Ascent mid-drive kit arrived, and I began building what will become the most awesome electric bike ever! (That’s my opinion and I’m sticking by it.) Pics attached.
Some specs for the curious: the motor is an Astro Flight 3220, a 6000-watt unit designed for huge R/C planes. It makes peak power between 6,000 - 10,000 RPM, so zoooom! This 4-turn motor’s windings use the highest grade of sintered samarium-cobalt magnet, offering a power-to-weight ratio 2-3 times greater than other motors, and a peak efficiency as high as 94%.
The motor is wrapped in a finely machined, finned aluminum casing, operated by a teeny power controller (compared to most behemoths out there - mine is that little finned box with green lettering on one side of the mounting bracket). It puts down the power through an integrated 20:1 internal-reduction eccentric reduction gearbox with zero parasitic power consumption (a patented item) and 2:1 secondary chain reduction, so the motor spins 40 times faster than the crankset, enabling me to pedal as well, if I can manage to keep up. There’s a freewheel (the silver thingy with a gear attached) that allows me to just stand on the pedals while the motor does the work, if I prefer.
The lithium battery is a 52-volt, 20-amp-hour monster that uses the fastest-discharging 18650 Samsung cells rated at 25R, sufficient to power this machine almost to its max of about 9 horsepower, 200 lb-feet wheel torque at 20mph, 65 lb-feet torque at 45mph, and a top speed well above that with the right gearing. It comes with a Cycle Analyst V.3 computer control unit that does All The Things, including allowing me to create three different power-control settings (say, one for street-legal, one for unlimited racing, and something reasonable in-between).
The bike itself is a crazy downhill monster, an NS Bikes Fuzz with 8″ of fork travel to absorb high-speed bumps, a 4-bar Horst-link suspension (a design with significant rearward axle movement to absorb vertical obstacles), hydraulic disc brakes, and tons of other great features. Plus it’s big and long, with 650b (27.5″) wheels, adding stability at speed on pavement or over rough terrain.
So yeah, most awesome ebike ever.
EDIT: Just finished building my new bike using the awesome Tangent Ascent mid-drive kit on a long-travel NS Bikes Fuzz downhill racer I got from a local. I’ve left the Cycle Analyst at full power (6000 watts), and will report soon on how it went!
Some specs for the curious: the motor is an Astro Flight 3220, a 6000-watt unit designed for huge R/C planes. It makes peak power between 6,000 - 10,000 RPM, so zoooom! This 4-turn motor’s windings use the highest grade of sintered samarium-cobalt magnet, offering a power-to-weight ratio 2-3 times greater than other motors, and a peak efficiency as high as 94%.
The motor is wrapped in a finely machined, finned aluminum casing, operated by a teeny power controller (compared to most behemoths out there - mine is that little finned box with green lettering on one side of the mounting bracket). It puts down the power through an integrated 20:1 internal-reduction eccentric reduction gearbox with zero parasitic power consumption (a patented item) and 2:1 secondary chain reduction, so the motor spins 40 times faster than the crankset, enabling me to pedal as well, if I can manage to keep up. There’s a freewheel (the silver thingy with a gear attached) that allows me to just stand on the pedals while the motor does the work, if I prefer.
The lithium battery is a 52-volt, 20-amp-hour monster that uses the fastest-discharging 18650 Samsung cells rated at 25R, sufficient to power this machine almost to its max of about 9 horsepower, 200 lb-feet wheel torque at 20mph, 65 lb-feet torque at 45mph, and a top speed well above that with the right gearing. It comes with a Cycle Analyst V.3 computer control unit that does All The Things, including allowing me to create three different power-control settings (say, one for street-legal, one for unlimited racing, and something reasonable in-between).
The bike itself is a crazy downhill monster, an NS Bikes Fuzz with 8″ of fork travel to absorb high-speed bumps, a 4-bar Horst-link suspension (a design with significant rearward axle movement to absorb vertical obstacles), hydraulic disc brakes, and tons of other great features. Plus it’s big and long, with 650b (27.5″) wheels, adding stability at speed on pavement or over rough terrain.
So yeah, most awesome ebike ever.
EDIT: Just finished building my new bike using the awesome Tangent Ascent mid-drive kit on a long-travel NS Bikes Fuzz downhill racer I got from a local. I’ve left the Cycle Analyst at full power (6000 watts), and will report soon on how it went!
