lord_frosty
1 µW
- Joined
- Feb 6, 2022
- Messages
- 1
Hi all, I am new, brand new to endlesssphere, & this is my first post.
I am looking at different drive motors, to attach the drive motor to an S&M BMX frame, & use a rear hub with a double drive, meaning the hub has a right hand side flywheel, & a left hand side flywheel, both driving the bike forwards. The hub is a Profile Racing Drive-Bi hub, & i am going to get the Drive-Bi hub laced to one of my 48h rims, using 10, 11, or 12 gauge spokes. The question I have is about the dimensions of the QS138 V3 motor dimensions, as the printout on the golden motor website is all but legible, & upon emailing the manufacturer, they had said the dimensions were listed online.
I am basically going to build a set of plates, & bolt the motor to the plates, & strap the plates to the frame between two of the tubes, such as the seat tube, & top tube, or the top, & down tube, putting the controller, & battery into their own cases, & securing them to the top tube, using a similar idea of bracing the cases to one of the other tubes, so I don't have to drill the frame, although I might drill the frame depending on the motor dimensions, as I was playing around with how large I think it might be, the cranks will clear the motor between the tubes if i use the smallest size of 125mm long, as the spindles don't get big enough for the longer crank arms to pass by what I think the diagram says, but I am not sure exactly, & after seeing some images of the builds with the QS138 V3 3kw motor, the dimensions i have are wrong, they show that the motor is shorter than the actual depth, where the drum is for the magnets, & upon visually seeing the QS138 V3 motor, this is not the case.
So I am starting this thread as I get ready to make a purchase. I am not spending a ton of money right away, I am basically getting a kit with a motor, controller, & throttle, then a battery, & I am looking at 72v 20ah, to not break the bank, as I can always get another battery, which is larger, or make my own. Any input on this would be amazing, or if there is a QS138 V3 owner who can post the length, depth, & height of the QS138 V3 motor, possibly with images depicting which dimension is which!
I am thinking of using the QS138 V3 due to the 19:45 gearbox, & that i can easily attain an 18 tooth flywheel for my drive-bi wheel, & use a 9 tooth keyway sprocket on the drive shaft. I have read that too much power can shred a flywheel, which is fine, I am hopeful that a 72v 20ah battery is pulling a peak around 5kw-6kw, so I can get up to speed in traffic, with cars moving around 40mph - 50mph, on city streets.
As far as drilling the frame, I am hopeful to get some braze on rack mounts, cutting a hole for each, so I can use front racks, & rear racks, & waterproof panniers, or hard shell adventure motorcycle cases, to do errands with, & to get to, & from work, as the local public transit takes upwards of 2 hours to get me to the jobsite, which would be cut down to around 15 minutes, if I could get the bike to be easily doing 40mph - 50mph, the top speed achieved is nominal to me, I just want something with a ton of acceleration, enough that I can pull wheelies, & would need to use some care with, which I am pretty sure I can get with this.
I am also interested in trail use, gearing down as low as I can for climbing, not speed, as there is a lot of beautiful areas I hike, & take single speed bikes, whether 20", or 26" on rides, my favorite being a river valley, which outside of taking in the scenery, I use parts of the massive expanse of downhill for offroad mx, & enduro riding.
Thanks! Ride safe!
I am looking at different drive motors, to attach the drive motor to an S&M BMX frame, & use a rear hub with a double drive, meaning the hub has a right hand side flywheel, & a left hand side flywheel, both driving the bike forwards. The hub is a Profile Racing Drive-Bi hub, & i am going to get the Drive-Bi hub laced to one of my 48h rims, using 10, 11, or 12 gauge spokes. The question I have is about the dimensions of the QS138 V3 motor dimensions, as the printout on the golden motor website is all but legible, & upon emailing the manufacturer, they had said the dimensions were listed online.
I am basically going to build a set of plates, & bolt the motor to the plates, & strap the plates to the frame between two of the tubes, such as the seat tube, & top tube, or the top, & down tube, putting the controller, & battery into their own cases, & securing them to the top tube, using a similar idea of bracing the cases to one of the other tubes, so I don't have to drill the frame, although I might drill the frame depending on the motor dimensions, as I was playing around with how large I think it might be, the cranks will clear the motor between the tubes if i use the smallest size of 125mm long, as the spindles don't get big enough for the longer crank arms to pass by what I think the diagram says, but I am not sure exactly, & after seeing some images of the builds with the QS138 V3 3kw motor, the dimensions i have are wrong, they show that the motor is shorter than the actual depth, where the drum is for the magnets, & upon visually seeing the QS138 V3 motor, this is not the case.
So I am starting this thread as I get ready to make a purchase. I am not spending a ton of money right away, I am basically getting a kit with a motor, controller, & throttle, then a battery, & I am looking at 72v 20ah, to not break the bank, as I can always get another battery, which is larger, or make my own. Any input on this would be amazing, or if there is a QS138 V3 owner who can post the length, depth, & height of the QS138 V3 motor, possibly with images depicting which dimension is which!
I am thinking of using the QS138 V3 due to the 19:45 gearbox, & that i can easily attain an 18 tooth flywheel for my drive-bi wheel, & use a 9 tooth keyway sprocket on the drive shaft. I have read that too much power can shred a flywheel, which is fine, I am hopeful that a 72v 20ah battery is pulling a peak around 5kw-6kw, so I can get up to speed in traffic, with cars moving around 40mph - 50mph, on city streets.
As far as drilling the frame, I am hopeful to get some braze on rack mounts, cutting a hole for each, so I can use front racks, & rear racks, & waterproof panniers, or hard shell adventure motorcycle cases, to do errands with, & to get to, & from work, as the local public transit takes upwards of 2 hours to get me to the jobsite, which would be cut down to around 15 minutes, if I could get the bike to be easily doing 40mph - 50mph, the top speed achieved is nominal to me, I just want something with a ton of acceleration, enough that I can pull wheelies, & would need to use some care with, which I am pretty sure I can get with this.
I am also interested in trail use, gearing down as low as I can for climbing, not speed, as there is a lot of beautiful areas I hike, & take single speed bikes, whether 20", or 26" on rides, my favorite being a river valley, which outside of taking in the scenery, I use parts of the massive expanse of downhill for offroad mx, & enduro riding.
Thanks! Ride safe!
