Bafang 8Fun SWXK5
- Thread starter outside
- Start date
bdteakle
1 mW
Thanks for the review Outside, very interesting.
Do the different flange diameters require different spoke lengths on each side?
I've had the same problem with the Bafang SWXK and disc brakes. With normal spoking there isn't enough room for the caliper to mount a 180mm disc.
I've just recently made up a couple of wheels with different spoking, which makes enough room for 180mm disks on the SWXK. I've run all LHS spokes on the inside of the flange, which leaves plenty of room for the caliper. Here are some pics:
View attachment 2
This last pic shows the caliper from above on a 180mm disc..
My only concern is that I don't know whether there will be long-term problems from spoking this way. It certainly puts different strains on the spoke elbows between the over and under spokes. I got the idea from a commercially assembled "Nope" brand ebike which had all spokes on its rear hub motor running inside the flanges, but used rim brakes.
I used a rim and spokes kit supplied by BMSBattery.com. The spokes are 2.3mm dia (13G). I used 2-cross pattern.
The Bafang SWXH rear hub motors appear to have plenty of space around the disc, so that even a 160mm disc can be used without special spoking.
Your website looked very interesting Outside, but I couldn't read any pages except the SWXK review. Have I missed something or do I need to learn Italian?
Bruce.
Do the different flange diameters require different spoke lengths on each side?
I've had the same problem with the Bafang SWXK and disc brakes. With normal spoking there isn't enough room for the caliper to mount a 180mm disc.
I've just recently made up a couple of wheels with different spoking, which makes enough room for 180mm disks on the SWXK. I've run all LHS spokes on the inside of the flange, which leaves plenty of room for the caliper. Here are some pics:
View attachment 2
This last pic shows the caliper from above on a 180mm disc..
My only concern is that I don't know whether there will be long-term problems from spoking this way. It certainly puts different strains on the spoke elbows between the over and under spokes. I got the idea from a commercially assembled "Nope" brand ebike which had all spokes on its rear hub motor running inside the flanges, but used rim brakes.
I used a rim and spokes kit supplied by BMSBattery.com. The spokes are 2.3mm dia (13G). I used 2-cross pattern.
The Bafang SWXH rear hub motors appear to have plenty of space around the disc, so that even a 160mm disc can be used without special spoking.
Your website looked very interesting Outside, but I couldn't read any pages except the SWXK review. Have I missed something or do I need to learn Italian?
Bruce.
outside
10 mW
- Joined
- Feb 27, 2010
- Messages
- 31
thanks bdteakle for yours information,
-yes, for K5 there is need two different spoke lengths
-K5 are made for resolve caliper interference with spokes
-for SWXK I think is possible resolve caliper interference using a 203mm disc,
tomorrow I will buy one then I tell you if all is ok.
-the spokes should overlap to make stronger the wheel. You just have to check after a while 'km if your solution works seamlessly
-Yes, for SWXH there is not problem for disc and caliper.
It is only for SWXK series that have this problem and K5 is solution for this.
I have a lot of page on my web site , and I can't translate all.
I think that Google translate can help you for this.
Outside
p.s. sorry for my English!
-yes, for K5 there is need two different spoke lengths
-K5 are made for resolve caliper interference with spokes
-for SWXK I think is possible resolve caliper interference using a 203mm disc,
tomorrow I will buy one then I tell you if all is ok.
-the spokes should overlap to make stronger the wheel. You just have to check after a while 'km if your solution works seamlessly
-Yes, for SWXH there is not problem for disc and caliper.
It is only for SWXK series that have this problem and K5 is solution for this.
I have a lot of page on my web site , and I can't translate all.
I think that Google translate can help you for this.
Outside
p.s. sorry for my English!
bdteakle
1 mW
Thanks for the note Outside. Your bike is looking good.
I imagine the 203mm disc will be good for your mountainous riding. I live in (much smaller) mountains myself and have recently switched to using disc brakes after wearing out rims and overheating tyres. The long descents still turn the discs blue and produce hot smells (I'm not sure where from yet).
Where are you buying your ebike gear (I assume I'd know if I could read Italian)?
All your gear looks exactly the same as I have been buying from BMSBattery.com. So far I have been happy with their service. Just as well, as I'm not aware of other reliable exporters of Bafang hubs.
BMSBattery seem to prefer to sell their "Cute" brand of hubs, which don't have the quality of the Bafang as far as I can see. The one rear Cute hub I have tried required very severe dishing to centre the rim. Bafang rear hubs are much better designed and require very minimal dishing, producing a very strong wheel. The 3 phase disconnect plug on the Bafang front hubs is excellent, especially for flat tyres.
Can you also say something about your power use Outside? The power graphs you provided indicated very low amperages. Are you restricting current to increase range? I thought I was the lowest amperage member of the forum (I stick to the Australian 200w limit) until I read your QSWXK review.
Bruce.
I imagine the 203mm disc will be good for your mountainous riding. I live in (much smaller) mountains myself and have recently switched to using disc brakes after wearing out rims and overheating tyres. The long descents still turn the discs blue and produce hot smells (I'm not sure where from yet).
Where are you buying your ebike gear (I assume I'd know if I could read Italian)?
All your gear looks exactly the same as I have been buying from BMSBattery.com. So far I have been happy with their service. Just as well, as I'm not aware of other reliable exporters of Bafang hubs.
BMSBattery seem to prefer to sell their "Cute" brand of hubs, which don't have the quality of the Bafang as far as I can see. The one rear Cute hub I have tried required very severe dishing to centre the rim. Bafang rear hubs are much better designed and require very minimal dishing, producing a very strong wheel. The 3 phase disconnect plug on the Bafang front hubs is excellent, especially for flat tyres.
Can you also say something about your power use Outside? The power graphs you provided indicated very low amperages. Are you restricting current to increase range? I thought I was the lowest amperage member of the forum (I stick to the Australian 200w limit) until I read your QSWXK review.
Bruce.
outside
10 mW
- Joined
- Feb 27, 2010
- Messages
- 31
Thanks for the appreciations to my bicycle,Bruce,
is true in the long descents is the risk that the wheel rims are much warmer, a disc brake bigger, better cooling.
I bought the kit from a shop in Italy, but the origin is BMS battery.
The "Cute" I have not tested yet, so I do not know anything.
The graphs refer to the original controller of Bafang 8Fun.
Normally I use a 36V controller - 6 mosfet - 17A, of BMS Battery.
I also did tests with controller, 48V-500 Watt- 12 Mosfet- 30A, in which case the input current reaches 30A and 1.3 kW peak!
for consumption at 36V can read here, I'm sorry but it's in Italian
http://www.webalice.it/c.designer/bafang_k5_250w_4.htm
is true in the long descents is the risk that the wheel rims are much warmer, a disc brake bigger, better cooling.
I bought the kit from a shop in Italy, but the origin is BMS battery.
The "Cute" I have not tested yet, so I do not know anything.
The graphs refer to the original controller of Bafang 8Fun.
Normally I use a 36V controller - 6 mosfet - 17A, of BMS Battery.
I also did tests with controller, 48V-500 Watt- 12 Mosfet- 30A, in which case the input current reaches 30A and 1.3 kW peak!
for consumption at 36V can read here, I'm sorry but it's in Italian
http://www.webalice.it/c.designer/bafang_k5_250w_4.htm