Geebee
1 kW
They are gorgeous, I love the relaxed geometry much more rider friendly. 
New Bafang Crank-Drives
- Thread starter d8veh
- Start date
greenspark
100 W
- Joined
- Oct 23, 2011
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- 176
Thanks Miles, I got it by increasing the image size.
See the pictures on page 47, last posting
See the pictures on page 47, last posting
greenspark
100 W
- Joined
- Oct 23, 2011
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- 176
They truly don't make them like they used to.Geebee said:They are gorgeous, I love the relaxed geometry much more rider friendly.
Kepler
10 MW
Yes, and thank god for that . Just kidding. I am sure vintage has its market.
Greenspark, that is a fair investment in drives. Did you get any of the 750W versions for those who are looking for a bit more power?
. Just kidding. I am sure vintage has its market.Greenspark, that is a fair investment in drives. Did you get any of the 750W versions for those who are looking for a bit more power?
Kepler
10 MW
rodgah said:
Wow, 160whrs and 30km out of a HT. Now that is economy.
The drive would work on a freeride/dh bike and was my plan for a while. Ended up deciding against it though going back to an XC setup because I found I was doing a lot of pedaling on my test bike when using it off road. Also, it was very hard finding a DH/freeride frame that had a 68mm bottom bracket and rear suspension that cleared the drives final output gear cover and 48mm chain ring. I was willing to go down to a smaller chainring, but the 750W unit suits the bigger chain ring best.
Kepler
10 MW
Thought it was interesting to see that this drive has been used on the new Caterham concept carbon ebike http://www.flickr.com/photos/caterhambikes/sets
greenspark
100 W
- Joined
- Oct 23, 2011
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- 176
Kepler said:Yes, and thank god for that
Greenspark, that is a fair investment in drives. Did you get any of the 750W versions for those who are looking for a bit more power?
No, we thought about it, but 300W is the legal limit and this was for a buying group. There was a big savings in shipping. Tomorrow is the installation party when everyone brings their bikes on a glorious summer day down under.
Their has been comments about how the power and speed of the bafang 350 and 750w kit seems to be less them people have expected for the wattage, i.e compared to hub motors and other midrives. Could this be to do with the low efficiency of the muli stage helical gear reduction system discussed here ?
http://endless-sphere.com/forums/viewtopic.php?f=2&t=56903
i.e it shows up as a lot of watts consumption, but the actual output power at the wheels is a lot less and hence slower speeds then people think it should be per watts ?
http://endless-sphere.com/forums/viewtopic.php?f=2&t=56903
i.e it shows up as a lot of watts consumption, but the actual output power at the wheels is a lot less and hence slower speeds then people think it should be per watts ?
rodgah
10 kW
Kepler said:
like I said....considerable pedaling and slow speeds :lol:. I assumed this drive fitted on a 73mm BB too? It is not easy to find a suitable frame....especially newer than about 06. Frames like Transition Blindside, blur the lines between FR and all-mountain....which realistically is what I ride. Still has an ISCG mount to grind down, but at a guess would have the chainstay clearance needed since it can be setup as 2sp front.
In some respects a 29er is very suitable so you dont have to use such a large chain ring....or a 11t cassette for that matter either. Decisions decisions
greenspark
100 W
- Joined
- Oct 23, 2011
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- 176
jk1 said:
The link is mine, and I was not observing lower power, but rather trying to sort out real performance in the context of the NZ law on ebikes. I would say the power feels about right compared to other ebikes (and a whole lot better than the Cute100F that is supposed to be 350W!)
Kepler
10 MW
rodgah said:
A 73mm BB works too. I think you just need to omit the lock nut and use Loctite on the main nut.
Yep, 2006 is about the year. The frame I have I believe is a 2005 or 2006 model although it was purchased new. When the frame came out apparently it was $1,800 bucks and I picked up mine $280. Which is why I grabbed the last 2 also.
The drive would work well on a nice XC 29er. Keep in mind, the stock 48mm chain ring gives the best chain line due to its offset being able to clear final drive gear cover.
dbaker,
Thanks for the link. I may have to run one of those ders someday. Nice to know I can make it work with my stuff.
I understand the idea behind these low profile ders was to make it stick out less, but they ended up with the cable clamp terrifyingly close to the spokes.
Thanks for the link. I may have to run one of those ders someday. Nice to know I can make it work with my stuff.
I understand the idea behind these low profile ders was to make it stick out less, but they ended up with the cable clamp terrifyingly close to the spokes.
Rassy
1 MW
I just stuck an 8 speed Shimano Nexus behind a Bafang crank drive for my sister. It seems like a real nice match, but I've just done a few short test rides so far, including grades up to 20%.
I replaced the Nexus on my trike with a NuVinci auto shift because the Nexus didn't like to shift under load. The half twist shifter turned easy but didn't actually shift until a slight decrease in load and then it would clunk, which probably wasn't too good for it. I've read that the Alfine also clunks when shifted under load.
dbaker,
"Do you buy from the wholesaler you referenced earlier for the cranks? I looked for crank arms and could only find left ones for square taper."
This is a US distributor that all US shops deal with. The cranks are all left side. It is easy for a shop mechanic to run a right side tap through a left side crank, from the back side. It will then work fine as a right side crank. Just run the pedal in by hand, before using a wrench, to make sure you haven't cross-threaded it. Somebody on here pointed out that standard left side cranks may curve out further than the Bafang cranks, making for an even wider Q than mid-drives already suffer from.
"Do you buy from the wholesaler you referenced earlier for the cranks? I looked for crank arms and could only find left ones for square taper."
This is a US distributor that all US shops deal with. The cranks are all left side. It is easy for a shop mechanic to run a right side tap through a left side crank, from the back side. It will then work fine as a right side crank. Just run the pedal in by hand, before using a wrench, to make sure you haven't cross-threaded it. Somebody on here pointed out that standard left side cranks may curve out further than the Bafang cranks, making for an even wider Q than mid-drives already suffer from.
mushymelon
1 kW
Kepler said:
Its a great looking sculpture for sure the $5 walmart pedals make me laugh.
The time and money they spent hiding an off the shelf motor could of been spent machining some cool crank arms, pedals and a bash guard.
They should of at least integrated the bafang internals into their frame.
Kepler
10 MW
Those pedals look shocking. Would have taken very little to put some blinged up DH pedals on.
I actually quite like the motor cover design. It has me thinking. Hmm, time to hit SolidWorks I think.
I actually quite like the motor cover design. It has me thinking. Hmm, time to hit SolidWorks I think.
Kepler
10 MW
Since I have a couple of weeks to wait before my new clutched derailleur arrives, thought I would have another go with making my 10 speed roadbike derrailleur (105) and close ratio (11-25) Ultegra 10 speed cluster work with the 10 speed Dyna-Sys Rapid fire shifter.
Problem I was having was that the shifter was overdriving the derailleur and making it jump 2 gears in the middle range of the cluster. To try and fix this, I needed to change how far each click of the shifter would move the derailleur. Here is what i did.
every gear is now indexing although it does do the occasional double skip. Not perfect, but much better. I would say about 90% of perfect. As you can see from the picture, the lever point has changed quite a bit and as such the cable alignment is not great. Still feels quite smooth though.
Gave it a good bash though my test track. Could not get the chain to drop. Go figure :lol:
I really like the close ratio cluster too. Gear changes are silky smooth with the ratio's so tight. Need to decide if 25 is high enough for the type of riding I am doing.
Problem I was having was that the shifter was overdriving the derailleur and making it jump 2 gears in the middle range of the cluster. To try and fix this, I needed to change how far each click of the shifter would move the derailleur. Here is what i did.
every gear is now indexing although it does do the occasional double skip. Not perfect, but much better. I would say about 90% of perfect. As you can see from the picture, the lever point has changed quite a bit and as such the cable alignment is not great. Still feels quite smooth though.
Gave it a good bash though my test track. Could not get the chain to drop. Go figure :lol:
I really like the close ratio cluster too. Gear changes are silky smooth with the ratio's so tight. Need to decide if 25 is high enough for the type of riding I am doing.
teslanv
1 MW
I am curious what top speed you guys are getting with the unlimited programming.
Mine was programmed with a 31mph (50 kph) max.
I have thought about changing the wheel diameter from 26" to 20" to trick the controller, and wondering if anyone else has done this with good results.
Mine was programmed with a 31mph (50 kph) max.
I have thought about changing the wheel diameter from 26" to 20" to trick the controller, and wondering if anyone else has done this with good results.
teslanv,
"I am curious what top speed you guys are getting with the unlimited programming.
Mine was programmed with a 31mph (50 kph) max."
On a 26 x 2.35 MTB wheel, or a 700 x 25 roadbike wheel, with a 48 tooth chainring, and an 11 tooth cog, you are looking at 31 mph at 90 crank rpms. If you don't pedal, this will require about 48v x 25a = 1200 watts at the wheel, on level ground, no wind.
[edit] Meant to say 1200 watts battery...about 900 at the wheel...same conclusion.
Given the 25 amp limit on the controller, and the 48 volt nominal voltage, I think you have all you can reasonably expect from this drive.
If you want more than this, get a big hubmotor.
"I am curious what top speed you guys are getting with the unlimited programming.
Mine was programmed with a 31mph (50 kph) max."
On a 26 x 2.35 MTB wheel, or a 700 x 25 roadbike wheel, with a 48 tooth chainring, and an 11 tooth cog, you are looking at 31 mph at 90 crank rpms. If you don't pedal, this will require about 48v x 25a = 1200 watts at the wheel, on level ground, no wind.
[edit] Meant to say 1200 watts battery...about 900 at the wheel...same conclusion.
Given the 25 amp limit on the controller, and the 48 volt nominal voltage, I think you have all you can reasonably expect from this drive.
If you want more than this, get a big hubmotor.
Kepler
10 MW
100% agree. My experience when using this drive for commuting duties is that you will get it up to 31mpg with the throttle but don't expect to leave it there and have the drive live a long fruitful life.
I am finding that 20mph to 26mph is the max continuous speed you can expect out of this drive and is what you get when using PAS only on the highest speed setting. Still not too shabby for a small quite compact drive IMO.
I am finding that 20mph to 26mph is the max continuous speed you can expect out of this drive and is what you get when using PAS only on the highest speed setting. Still not too shabby for a small quite compact drive IMO.
eride
10 mW
There’s a new mid-drive player In town
Specifications
250w/350w-36V and 500w/750w-48V
1. Torque sensor mm and Speed sensor mm
2. Shift gear range 39 to 54
3. Controller inside, lcd
4. 20-40kmh;28Nm-60Nm
Mr. Colin Sheng says this krank-drive kit will start sell mid March
http://www.szxfmotor.com.cn/product/702022359-213635401/Middle_motor_250W_350W_500W_750W.html
This factory has a very good reputation for their XOFO hub motors and it will be interesting to see how these new mid-drives perform compared to Bafang BBS
Specifications
250w/350w-36V and 500w/750w-48V
1. Torque sensor mm and Speed sensor mm
2. Shift gear range 39 to 54
3. Controller inside, lcd
4. 20-40kmh;28Nm-60Nm
Mr. Colin Sheng says this krank-drive kit will start sell mid March
http://www.szxfmotor.com.cn/product/702022359-213635401/Middle_motor_250W_350W_500W_750W.html
This factory has a very good reputation for their XOFO hub motors and it will be interesting to see how these new mid-drives perform compared to Bafang BBS
