The other day I went out to the ebike shed to try to find something to ride. Much to my dismay, every single bike I owed was broken or out of commission. I had let my maintenance issues fall a little too far behind and there was literally 15 broken ebikes that I couldn’t use. I find…
There has been a near-mutiny of BBS02 owners (rioting in the streets) who have been disgruntled that their BBS02 units have shipped either without any grease in the secondary reduction gears or with the ill-suited white lithium grease in the secondary reduction gears. Both setups are not appropriate and will cause premature secondary pinion destruction and…
In the past, I’ve told people when they replace the nylon gear (instructions are here) to use heavy axle grease on it as the Lithium grease that it ships with is incredibly light and tends to just spin-off the primary reduction gears when they are spinning at around thousands of RPM. After 5 minutes of…
In so many ways Bafang’s BBS02 750W drive unit is a dream come true. Almost anyone with very little technical know how can order a drive kit and 48v-52v battery pack and have it installed and running on almost any bike with 2-3 hours of work. Any other mid-drive ebike kit is going to take a…
It took several years for BMC to realize that Nylon planetary gears in their larger geared hubs like the Mac motors could not take the kind of loads that people were dumping into them. Eventually they learned their lesson and switched to using composite gears, but with the BBS02 Bafang still haven’t wised up and made the primary reduction…
Your BBS02 will give you years of service and love if it is treated properly. The BBS02 loves to eat Watts, but not too many and not too fast. The Pedal Assist system even at its highest setting will only put out around 750 Watts which the BBS02 can eat all day long without overheating…
Bafang has finally decided that their P75NF75 mosfets on the 750 Watt BBS02 are grossly inadequate for the 1200 Watts that they allow to flow through the controller when it is cranked on. It sounds like they are now using the IRFB3077 mosfets which should run much cooler and be able to handle more amps for longer without…
Heat is the enemy. Electric motors can often take far more power put through them than their nominal rating, but over time the heat will build up and cause all sorts of problems. Mosfets can blow, phase wire insulation can melt, windings can fuse together. When the motor starts being under high torque load and…
I have hundreds of hours trailriding on the BBS02, here is the BBS02 motor problems I have had so far One bent axle Two broken plastic gear covers One blown controller Two bent chainring adapters One motor has an awfully squeaky clutch Three broken speedos and one lost magnet Two stripped out Bafang crankarms One stripped out…
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