Bafang G310 vs Bafang BFSWX02. What is the difference?

[eecsflyer]

I really like the Bafang G310 motor available through Grin Tech, [youtube]https://www.youtube.com/watch?v=8sGFoJUO-BM[/youtube]

I particularly like how quiet it is. I found a local shop that has a 500W Bafang, BFSWX02, kit. I think it is very similar to this kit on amazon, https://www.amazon.com/Conversion-Wheel-Electric-BAFANG-Display/dp/B07QKVX7GM?th=1&psc=1.

Any ideas if these might be the same motor on the inside? I took a picture and the wire is routed through the axle, https://photos.app.goo.gl/LTnSArd4D8aYH7gt8, while the G310 is not. If they are not, any idea what motor I should select in the Grin motor simulator that is equivalent? https://www.ebikes.ca/tools/simulat...frame=full&mass=120&axis=mph&grade=8&throt=40

Anybody have experience using a Bafang hub motor in a road bike for climbing hills?

 

[ions82]

The 310 will have plenty of power for a road bike. I recently installed one, and it's dead silent. It should be plenty sufficient for a road bike that is also utilizing pedal power. Having the wiring come out if the hub makes things a little cleaner. However, one thing to note is that the 310 isn't really set up to use with a torque arm. So, it relies on the strength of the dropouts. The other hub could probably utilize a torque arm. Does your road bike have disc brakes? Would it be OK with 135mm axle spacing? Would the dropouts be OK with the torque of a hub motor?

 

[eecsflyer]

Thanks for the response. Yes I have disc brakes. This is actually for my handcycle. You can see a video of it here, [youtube]https://youtu.be/TNoAhmKTuk8?t=3[/youtube]. It does have disc brakes and has about 139mm dropout spacing.

Good to know about the lack of torque arms. Yeah, would be a bummer to damage my frame. Handcycles are pretty expensive. I did find a torque arm for the 311, but that is the front wheel version, https://www.ebikes.ca/shop/electric-bicycle-parts/torque-arms/torqarm-311.html#. I wonder why other torque arms like this one, https://www.ebikes.ca/shop/electric-bicycle-parts/torque-arms/torqarm-v3.html, won't work?\

I actually ended up deciding to go with a direct drive motor (Crystalyte H3525) as it outperformed the G310 pretty handily in climbing. In both range and efficiency (which I was not expecting). I am aware that this will dramatically increase the weight of my bike, but ultimately I need something that can get me up the hill. As I cycle with my hands, I'd say I lost about half my power output. Would you say the G310 could make up for a 50% drop in human power? If so, maybe I may need to rethink my decision.

 

[ions82]

I just installed a 310 on a handcycle (Force 3). Trust me. It is plenty of power. It's amazingly quiet (can't even hear it). I am also a handcyclist. I am thinking about getting a G310 for one of my bikes, as well. The one I just did is for a customer. I would avoid direct drive hubs as it would REALLY hard to pedal should the drive system conk out on you. The lighter geared hub with a Sprague clutch would add no additional resistance. Cranking a dead DD hub uphill (or even on flat terrain) would be brutal.

Although the G310 can hit 500 watts, most riding wouldn't need more than about 200-250. Along with your power input, you could easily keep up with any able-bodied riders. I used a 24-pole PAS sensor, and it worked great. For a road handcycle, the G310 is the best option I've come across. I probably wouldn't use it for off-road, though. My trail bike has a BBS02.

 

[NCC1941]

Thanks for the response. Yes I have disc brakes. This is actually for my handcycle. You can see a video of it here, [youtube]https://youtu.be/TNoAhmKTuk8?t=3[/youtube]. It does have disc brakes and has about 139mm dropout spacing.

Good to know about the lack of torque arms. Yeah, would be a bummer to damage my frame. Handcycles are pretty expensive. I did find a torque arm for the 311, but that is the front wheel version, https://www.ebikes.ca/shop/electric-bicycle-parts/torque-arms/torqarm-311.html#. I wonder why other torque arms like this one, https://www.ebikes.ca/shop/electric-bicycle-parts/torque-arms/torqarm-v3.html, won't work?\

The reason is that the G310/G311 has round axles, like you'd find on a normal wheel, rather than the flattened axles you find on typical hub motors. The G311 (and I assume the G310 as well?) axle has a small flat section further in from the dropouts, which is where the stock torque washer sits, and where the G311-specific torque arm sits, replacing the torque washer.

 

[eecsflyer]

I just installed a 310 on a handcycle (Force 3). Trust me. It is plenty of power. It's amazingly quiet (can't even hear it). I am also a handcyclist. I am thinking about getting a G310 for one of my bikes, as well. The one I just did is for a customer. I would avoid direct drive hubs as it would REALLY hard to pedal should the drive system conk out on you. The lighter geared hub with a Sprague clutch would add no additional resistance. Cranking a dead DD hub uphill (or even on flat terrain) would be brutal.

Although the G310 can hit 500 watts, most riding wouldn't need more than about 200-250. Along with your power input, you could easily keep up with any able-bodied riders. I used a 24-pole PAS sensor, and it worked great. For a road handcycle, the G310 is the best option I've come across. I probably wouldn't use it for off-road, though. My trail bike has a BBS02.

Cool that is exactly what I am doing (except with a massive Crystalyte HS3525, ~1,200W). Any chance you could connect me with your customer? I'd love to ask him some questions. He could save me a lot of hassle getting a too powerful setup. I've been on the fence about this for two weeks now and just put in my order a couple days ago, but they have not shipped it yet..

 

[ions82]

I am still working on it for him. I have to replace the MOSFETs in the controller (Grinfineon 20A). His Force 3 had a manufacturing defect that caused the chain to bind and stop the wheel. He was in the smallest cog and hit the throttle while stopped (pretty much the worst thing you could do to it.). That was on his test ride. You may want to consider grinding away some of the material just behind the smallest cog. It is not an uncommon problem with Top End bikes. It's an easy thing to overlook and can cause damage if there is a chain jam (with or without an e-assist.)

The DD hub you ordered won't be a bad option. It is just a little overkill. It won't be silent like the G310, but it won't be noisy. They are dead simple and reliable. It's not likely that you'll ever have to pedal it home. Calculations might show that it's more efficient than the G310, but is that when climbing or going less than it's rated speed? DD motors lose some of their efficiency when they are run below their rated RPM.

 

[goatman]

I am still working on it for him. I have to replace the MOSFETs in the controller (Grinfineon 20A). His Force 3 had a manufacturing defect that caused the chain to bind and stop the wheel. He was in the smallest cog and hit the throttle while stopped (pretty much the worst thing you could do to it.). That was on his test ride. You may want to consider grinding away some of the material just behind the smallest cog. It is not an uncommon problem with Top End bikes. It's an easy thing to overlook and can cause damage if there is a chain jam (with or without an e-assist.)

The DD hub you ordered won't be a bad option. It is just a little overkill. It won't be silent like the G310, but it won't be noisy. They are dead simple and reliable. It's not likely that you'll ever have to pedal it home. Calculations might show that it's more efficient than the G310, but is that when climbing or going less than it's rated speed? DD motors lose some of their efficiency when they are run below their rated RPM.

theres a problem with the 3525 on the front, I didn't realise the front fork is really a rear triangle mounted upfront.
problem with mounting is centering the tire on the centerline of the bike. even when I fully dished my wheel I was 1/4 inch off centerline. I took off 7 speed and went to single speed freewheel. then ground the axle shaft to shift the motor over to center line. aren't your bikes 10 speed freewheels? can you switch to 7speed freewheel to stop chain jam? and go with the g310?

 

[eecsflyer]

I am still working on it for him. I have to replace the MOSFETs in the controller (Grinfineon 20A). His Force 3 had a manufacturing defect that caused the chain to bind and stop the wheel. He was in the smallest cog and hit the throttle while stopped (pretty much the worst thing you could do to it.). That was on his test ride. You may want to consider grinding away some of the material just behind the smallest cog. It is not an uncommon problem with Top End bikes. It's an easy thing to overlook and can cause damage if there is a chain jam (with or without an e-assist.)

The DD hub you ordered won't be a bad option. It is just a little overkill. It won't be silent like the G310, but it won't be noisy. They are dead simple and reliable. It's not likely that you'll ever have to pedal it home. Calculations might show that it's more efficient than the G310, but is that when climbing or going less than it's rated speed? DD motors lose some of their efficiency when they are run below their rated RPM.

theres a problem with the 3525 on the front, I didn't realise the front fork is really a rear triangle mounted upfront.
problem with mounting is centering the tire on the centerline of the bike. even when I fully dished my wheel I was 1/4 inch off centerline. I took off 7 speed and went to single speed freewheel. then ground the axle shaft to shift the motor over to center line. aren't your bikes 10 speed freewheels? can you switch to 7speed freewheel to stop chain jam? and go with the g310?

So wheels with the 3525 will no longer be centered? Or is this an issue with all hub motors?

The BFSWX02 is actually at a local shop, so one benefit of going with them is they would install it for me and it would cost less than all the parts from Grin. That said, this is pretty much one of the various Bafang kits from Amazon, so I was worried about longevity.. I also like how the g310 is so quiet. How will going to a 7 speed help with chain issues? Will I have more space to put spacers in and play with the alignment then? Will I need a new chain if I go from a 9 speed to a 7 speed?

 

[goatman]

a lot of ebike motors need to be dished to get the centerline. I had to work my axle. its not hard but as being new to this you might want to start with the G310. you wont need such a strong battery either but phaserunner is a must as far as im concerned.

the chain jam ions82? mentioned. I don't know, is the motor a cassette or freewheel, can space be saved by going to 7speed freewheel and then no chain jams? Ions82 is the one to be asking about that. once you go motorised hub a lot of the gears will never be used.
I saw in one of the pdf files, maybe parts file? they had the bionx 350 watt motor as an option, there isn't bionx anymore but maybe theres a thread or a picture showing if they went to 7speed freewheel in order to stop the chain jams.