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 This is the bike the way I am riding it today, 11/07..I am using the same battery system, 20 Ah 48v, but I have installed the BMC 850W motor on a Currie USPD drive. This drive has a thread-on adapter, not the adapter that clamps onto the spokes, so it is much more robust, and it is mated to a hub from Staton-Inc that has threads on both sides, RH on the right, LH on the left. These are the hubs Dave uses for his gas powered bikes, and they are not cheap, but they are the only ones that would work. Dave mounted the hub in a 48 spoke dual wall rim for me, and because I do not use a cluster on the right side we were able to make the wheel with no dish, so it should be able to take as much power as I am ever likely to need. I am using one of the Crystalyte 35A controllers, which I have modified with the IRFB4110 fets and increased the current limit to 50A. The CycleAnalyst allows me to adjust the current to any level I want. A couple of controllers I have modified just as I did this one are running at 80+A with no problems, and mine runs quite cool, but I did add a couple of ports to the Pelican case with the controller, and a thermostatically controlled fan. The bike came with a single 42T front chainring, which I have replaced with a 32-42-52 Shimano and the associated Octalink bottom bracket. I was not able to pedal fast enough to add significant power over 20 mph or so with the stock gearing, but with the 52T front chainring and the stock 11-34 Mega-Range cassete I can pedal to a much higher speed and still add pedal power to the motor. I have added the BB7 disk brake, and when I am coming down the mile long 6% grade coming home I am glad to have it. I am not sure if it stops any better, but it feels smoother and I have more confidence in its reliability. The rear brake is the stock caliper unit, but I changed the lever for one off a TidalForce bike with a built-in magnet and reed switch, so that lever cuts off the controller. The light is the Trail-Tech 35W HID which provides 1850 Lumens, as much as a 55W Halogen auto headlight high beam, and it sure does light up the night! I don't ride at night that much, but when I am I like to see what is in front of me. I also have flashing red lights on the back. The rack is from Topeak, and incorporates their trac-mount system, so I can just slide the pack onto the track on the rack and it locks into place. The rack is rated to 20 lbs but with the panniers full of groceries I often go over 30 lbs. I recently replaced my DrainBrain computer system with the newer version, the CycleAnalyst. This computer shows me speed, power, and distance, battery capacity used, and helps me combine my pedal power with the motor more efficiently. This new version has the capability to limit the maximum power and speed, so if the local law is 20 mph and 200 watts I can just dial that in. |
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