Topfire MD17, Bafang M600 build

jyl087

New Member
Region
USA
Hi all,
Thought I'd share my new "dream build". Inspired by positive reviews coming out of Chinese frames (e.g. Dengfu, ICANN), I set out to find a CF frame designed around the M600. I wanted an "all mountain" / enduro geometry: 150mm travel front and rear. I found a brand that I hadn't seen any reviews on called "Topfire". I decided to take the plunge and order a 17" frame, sight unseen. I figured that the frame itself was not a significant percentage of the build price, so even if it was no good, I would have options.

After four agonizing months of wait, the frame was ready sent to me. I chose a custom color, which added a bit of cost and time, but it was worth it. It arrived, well packed, and undamaged in shipping. I set out to build it with a Shimano 12sp drivetrain, 34T chainring, Shimano XT wheels and 4-piston brakes. Suspension wise, it rides on Fox Factory 36" x 150mm front fork and 51mm DPX2 rear shock (150mm wheel travel). Fox dropper completes the build.

So far, I am thrilled by the outcome of this project. The M600 is a bit noisier than the BBSHD, but the PAS on it is much better and more intuitive. Much less "jerking" at low speed, compared to the BBSHD. The battery is a Bafang BT-F04, which is rated at 600 Wh. It has a nominal voltage of 43V, which is a little bit of an oddball number (12S config. I'm still trying to figure this thing out. When fully charged, I read an open voltage of around +54V, which I thought was a 13S configuration. So, I'm a little confused... Anyone else use this battery?

Anyhow, I thought I'd just share to add to the tribal knowledge. I'm just one data point, but my experience with the Topfire frame is great!
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Gionnirocket

Well-Known Member
Region
USA
City
Y. O.
Nice build! Enjoy!

On the battery... Very odd configuration. I'd double check that you have the correct charger as full charge should be 49. 2V if I'm reading the specs correctly. That said you'd think that the bms would shut it down at the proper voltage.
How are you reading the 54v? Perhaps the display is set to the incorrect voltage? Or some communication error or poorly calibrated.
BT-F04
To be cautious I wouldn't charge above 49v until I got it sorted out. I'd contact the vendor asap for more info.
 

vincent

Well-Known Member
pretty bike!:):):)

i like the M600 motor
keep us up to date on how it does for you

what size frame is that? and how much was the frame?
 

jyl087

New Member
Region
USA
Nice build! Enjoy!

On the battery... Very odd configuration. I'd double check that you have the correct charger as full charge should be 49. 2V if I'm reading the specs correctly. That said you'd think that the bms would shut it down at the proper voltage.
How are you reading the 54v? Perhaps the display is set to the incorrect voltage? Or some communication error or poorly calibrated.
BT-F04
To be cautious I wouldn't charge above 49v until I got it sorted out. I'd contact the vendor asap for more info.
I think I'm ok. The battery and charger are both labeled correctly, and the charger states that it puts out 49.2V. Nothing seems to be abnormally hot when charging, so I think it's just some strangeness in my multimeter reading: when I connect it to the battery (standalone, not in the bike), it starts out at 49V and slowly climbs a few volts. Not sure why. I have a BESST that I can hookup to get individual cell data, I think.
 

Gionnirocket

Well-Known Member
Region
USA
City
Y. O.
I think I'm ok. The battery and charger are both labeled correctly, and the charger states that it puts out 49.2V. Nothing seems to be abnormally hot when charging, so I think it's just some strangeness in my multimeter reading: when I connect it to the battery (standalone, not in the bike), it starts out at 49V and slowly climbs a few volts. Not sure why. I have a BESST that I can hookup to get individual cell data, I think.
Very good then 👍
Overcharging the battery by that amount would be catastrophic 💣🙃
Yes it states that it has a smart bms and utilizing the CANBUS communication protocol. You should be able to get some detailed information on your display. Which display do you have?
 

jyl087

New Member
Region
USA
Very good then 👍
Overcharging the battery by that amount would be catastrophic 💣🙃
Yes it states that it has a smart bms and utilizing the CANBUS communication protocol. You should be able to get some detailed information on your display. Which display do you have?
I got the DP C240.CAN. I now realize that there is a C241 version with built-in bluetooth, which you can supposedly connect to your phone for more data.