Hi everyone,
First time poster here. I've been contemplating a build for the past few years and I've now got a fairly good idea what I want but have a few questions.
I'll likely be selling my motorbike (93 dr350s) to fund this project, and my goal is to have this bike basically be able to replace that bike. Not in speed and power but more that its something I can ride to uni everyday (very short commute), explore suburban roads/paths, and the odd dirt road/track.
So I've decided that what I want is something along the lines of a 3 to 5kw hub motor, dual suspension mtb. I havent bought the bike yet, but I'm thinking of going with something like an early 2000's downhill bike (something similar to a norco vps or old kona), as they have good suspension and brakes, and will hopefully be fairly stable.
To mount the motor I'm going to cut some steel plates that bolt on around the dropouts and slightly extend the wheelbase. I have access to a waterjet cutter, so I can very neatly cut the plates out of, say, 10mm steel.
Batteries, I'm thinking of using lipos and (depending on whats on special when I buy them) I'll likely be using three 6s 20Ah packs in series. Main reason I'm wanting to use lipos is that the bike likely won't have a big space for a battery, so it'll be easier to distribute three smaller sized batteries. I'll probably end up rewiring the cables with a bms, so that I can charge the bike with one charger, although maybe I am better off just starting with 18650s then?
My main questions are around the motor and controller setup. Top speed wise I'm not after anything too crazy, 60 to 70 km/h would be heaps. I do want it to be fairly torquey though, so I'm thinking somewhere in the 3 to 5kw range is good?
What I'm unsure about is how it should be configured. I could use a low kv motor, and give it heaps of volts and not so much current, or a could use a high kv motor and do the opposite. Both would result in similar speed and torque, but I'm sure that one of those setups in more preferable.
Hence, what I'm asking is what specific motor meets my requirements, and what battery setup with it?
I'd like to get a motor laced to a 26" bike wheel, as I'm doubtful that the bike's swingarm will clear a motorbike rim/tyre, but will pushbike spec spokes and rim be strong enough for that power level?
Thanks for any help.
First time poster here. I've been contemplating a build for the past few years and I've now got a fairly good idea what I want but have a few questions.
I'll likely be selling my motorbike (93 dr350s) to fund this project, and my goal is to have this bike basically be able to replace that bike. Not in speed and power but more that its something I can ride to uni everyday (very short commute), explore suburban roads/paths, and the odd dirt road/track.
So I've decided that what I want is something along the lines of a 3 to 5kw hub motor, dual suspension mtb. I havent bought the bike yet, but I'm thinking of going with something like an early 2000's downhill bike (something similar to a norco vps or old kona), as they have good suspension and brakes, and will hopefully be fairly stable.
To mount the motor I'm going to cut some steel plates that bolt on around the dropouts and slightly extend the wheelbase. I have access to a waterjet cutter, so I can very neatly cut the plates out of, say, 10mm steel.
Batteries, I'm thinking of using lipos and (depending on whats on special when I buy them) I'll likely be using three 6s 20Ah packs in series. Main reason I'm wanting to use lipos is that the bike likely won't have a big space for a battery, so it'll be easier to distribute three smaller sized batteries. I'll probably end up rewiring the cables with a bms, so that I can charge the bike with one charger, although maybe I am better off just starting with 18650s then?
My main questions are around the motor and controller setup. Top speed wise I'm not after anything too crazy, 60 to 70 km/h would be heaps. I do want it to be fairly torquey though, so I'm thinking somewhere in the 3 to 5kw range is good?
What I'm unsure about is how it should be configured. I could use a low kv motor, and give it heaps of volts and not so much current, or a could use a high kv motor and do the opposite. Both would result in similar speed and torque, but I'm sure that one of those setups in more preferable.
Hence, what I'm asking is what specific motor meets my requirements, and what battery setup with it?
I'd like to get a motor laced to a 26" bike wheel, as I'm doubtful that the bike's swingarm will clear a motorbike rim/tyre, but will pushbike spec spokes and rim be strong enough for that power level?
Thanks for any help.