That is what I am waiting for, at least an affordable one, John seems to have the most affordable RC drives for DIY,
Tangent Dave has done this, but he is using very expensive RC motors that are in the hundreds of dollars, and a large amount of custom machined parts.
Mike at LightingRod's was going to work on one, however he got stuck on some part of it, I think he is busy providing the same Drive he has been selling for a few years now so he is too busy perhaps to develop / design a RC mid drive. That sure is a shame, I was waiting for his for nearly a year , only to find out it is still not available.
There is talk of a GNG Pro X1 but we do not know the price of it yet and if it will have a throttle , and what the BCD is on the Crank , etc.
Kepler is the one person I think that can make a RC mid-drive , at an affordable price, he is using the cheaper motors from Hobby King that cost around $ 100 or even less.
Now in late 2018 it is possible to take a cheep Hobby King motor and a VESC 4 and do a very affordable mid drive, ... possible because Sram just came out with a Eagle EX 12 speed drive train. the whole drive train minus the BB is just under
$ 400 ! even less if you do not buy the crankset, which you do not need because with a DIY RC mid-drive you are going to need a freewheeling crankset.
The Sram Eagle EX 12 speed drive train is made for the torque of electric bikes, and has a large cog of 50 tooth, or is it even 52 tooth.
Combine that with a front crankset that has a 53 tooth chainring and a low KV RC motor and there might not need to be a reduction cog between the RC motor and the Chainring .
I sure would like John to work on this, that would be kit-able with the mount made by the end user for his/hers own bike design.
That would be the Holy Grail of Light Weight , budget priced Mid-Drives .
urga wrote: ↑
Oct 01, 2018 1:46 pm
Has anyon;e tried to use a similar motor setup but with a cog near the cranks providing the assist? Is that feasible,or is it opening a whole can of worms regarding gearing etc. I know it's not a friction drive,but I can't help thinking that mtbing has a whole different set of requirements that a friction drive can't address.
Probably just showing my ignorance here in all things technical.....