Yeah, 48v on the 6T will do about 40mph on a 26" wheel. That's just too much.
I run 57v ( 15S ) on my 8T in a 26" wheel, and yes, it is operating the motor close to it's short term limit. On a 29" sized wheel i would be more concerned.
I think you'd be pretty happy with the 30-32mph speeds that the 8T in a 29" wheel would pull. If you want faster, i'd go to a motor that can handle more power.
The 20" magic pie is a novelty motor, in reality! you can't even hit 30mph on 72v . I am going to tag team up with gary at golden motor canada and see if we can get them to do a custom winding for approx. 20mph on 36v in the 20" wheel. It would then be more like a 9T MAC motor. The 20" pie, can handle 41-42mph continuous for a good period of time but that requires 125v nominal, which is a bit on the crazy side....
BTW the magic pie cogs like a son of a bitch, so you will definitely want to keep it for another build
The MAC motors don't come with a gear cluster. You'll want a 7 speed 11t DNP freewheel, UNLESS you can find a shimano megarange with an 11t gear, which is far superior.
Forget having custom threaded freewheels made. Not gonna happen. threaded freewheels were marked for extinction in the 1990's and no company is serious about manufacturing them anymore.
Sorry, i don't remember the shipping cost, but i recommend the SAL shipping method. Sea freight can take 2-3 months and there is no guarantee that it will arrive.
olemetry wrote:Thanks guy. Now that I look a little closer, I think I see what you are saying. You recommend 8T just because of my intention to run 12s correct? Cellman gives a warning of 48V on 6T, but gives a warning of 60V on 8T. I do want another Golden Motor like the 20" molded wheel you have, but that will have to wait for a differnt build. I also want to freewheel with the Rockhopper, putting the controller in batteries like you have in a bag and then just unplug it and remove it to ride the bike regularly.
I assume that the 8T does not come with a 7-speed attached and yall kinda went back and forth in the thread about which one is a good one. Can you recommend who I should get the 7-speed from? What about the torque arms - I dont think I have anyone around here than can custom make them.
Also, what do you think the shipping is approx. from cell_man to New Orleans? I sent him a letter, but as you know it takes a while. Thanks again man. You do us all a great service!