jmygann wrote:Looks like something that might work with my bike .....
did you consider a 9c motor ?
How many gears after the hub motor installed ?
knoxie wrote:Hi, some advice
Nice setup and yes not surprised with the speed that you are seeing however that's a lot of power to reliably push through a BMC, you are running 66V at 35A, that's over the limit for those motors and controllers. The old school xltye controllers as you are using will work but the switching speed with the high rpms on the halls used to blow controllers frequently.
I have repaired so many of these motors and controllers now just passing a bit of advice along to you as I don't want to see your new ride compromised, the absolute top voltage you should run on these motors is 50V @ 35A any more than that and you are going to seriously affect its reliability its not a question of if but when it breaks.
Also keep hard starts down to a minimum and peddle or make rolling starts where you can, this will save the gears and the one way bearing, watch your motor temps as well excessive hill climbing or long high speed runs will cause the motor to warm, I have seen these get so hot the solder has melted just under the hub cover where the axle wires join.
Thanks for sharing and enjoy your new machine however I would highly recommend you drop the voltage down, I run the exact same set-up but with 12S2P 50V 10AH its the best compromise between power and reliability and it will still push you along at 30MPH which should be enough for anyone especially a newbie! my first bike only did 17mph no peddling and I thought that was magic!!
Cheers for sharing and have fun, stay safe and fit a handle bar mounted stop switch or change the throttle to a Magura, those hall effect throttles are notorious for going south, you can just get a mini moto stop switch off EBay and wire it in to the brake line on the controller, I have put this on all my rides and I am using Magura throttles, you wont stop this thing with your brakes if your throttle fails!
knoxie wrote:The newer versions of the BMC may be a lot tougher than the old ones, I will keep mine running on 50V for ultimate reliability and 30mph is plenty quick enough for me, if people want to really advance this hobby how about making a hub motor with an internal 3 speed gear that would be real progress, leave the friction drive systems to the past where they belong.
knoxie wrote:I for one will be selling one of the kids when they arrive
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