bobdk

First, I am not an expert on this. I just followed the advice of other guys [1] in my decision on greases. From the technical spec [4] of that grease I could not determine what it is based on. Some lithium-moly greases are apparently [2] save for plastics, so maybe. However petroleum based greases will dissolve (albeit slowly) the nylon gear, and thereby lead to accelerated deterioration [3]. I would not recommend you proceed and grease the nylon gear with Comma CV Lith-Moly Grease unless you can establish exactly what it is based on. [1] http://electric-fatbike.com/2015/12/23/mobilgrease-28-bbshdbbs02-because-a-good-mid-drive-is-better-seen-and-not-heard/ [2] http://nerfhaven.com/forums/topic/16267-plastic-safe-lubricants/ [3] http://www.rcgroups.com/forums/showthread.php?t=1750111 [4] http://www.commaoil.com/productsguide/view/6/212

I bought mobil 28 grease from here: http://www.aircraftspruce.eu/mobil-grease-28-98jf51.htm However, I can't say if it's better or worse than the Aeroshell 22. Futher, this grease has only been in the unit for one month (~500 km according to my tracker), and it is thus too early to conclude on whether it is better than a silicone-based grease or any other non-petrol based grease for that matter. The only thing that I can conclude is that mobil-28 did not cause the nylon gear to fail yet. In a month or two (i.e., after ~1000 km with this grease), I will strip the unit down again, to see how well the grease worked out. If most of the grease is still on the gear, I will consider it a success.

I have a BBS01 unit, since approx. September 2014. Bought from Woosh. In total I have covered 4800 km, or close to 3000 miles. Most of this is commuting to/from work, in all types of weather in Denmark. Around 3000 km, the unit started to develop some noises and vibrations. I tried to regrease the final gear using lithium-moly grease several times to solve this. Without luck. The noise got worse until I had covered between 4200-4400 km. Then I stripped the unit down, regreased with mobil-28 grease. This cleared all noises and most of the vibrations. I found that some lithium-moly grease had gotten in next door to the nylon gear. Not much, but clearly visible on the nylon gear's teeth. Besides that, the nylon gear was in mint condition without any signs of wear. Most of the original grease on the nylon gear had left the gear, due to rotational forces. The most disturbing thing I saw when stripping the motor down, is that the rubber seal that protects the compartment with the nylon gear from water was assembled incorrectly. Consequentially, water had gotten into this compartment (visible water drops near the broken seal), with clear signs of corrosion near the leak, and some minor on the stator and rotor. In your shoes, I would leave the unit as is. If it starts to develop signs of lack of grease, i.e., noises and vibrations, then consider stripping it down.