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What lube for electric motor bearings

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Kim Taylor18/09/2018 21:10:45
254 forum posts
53 photos

Hi all

I recently replaced the bearings in the E-Max motor fitted to my Wot 4 after a bit of a whoopsy caused the bearings to go noisy.

Long story short, the new bearings were growling from the start, obviously either out of spec balls (ooer missus!!) or more likely never lubed during manufacture.

The bearings are 8 x 14 x 4 stainless radial ball bearings with 2 shields, purchased from (not complaining - at £1.50 a pop, these things aren't going to be 100% reliable).

I've got some more bearings to go in, but want to make sure that they're lubed properly before I fit them and wonder what would be the right thing to do

Either - pick out one of the shields, flush out any oil / grease that;s in there and re lube with what??

Or - dunk the bearings in some EP gear oil or similar and let it permeate in past the shields overnight before fitting.

Any thoughts?



Edited By Kim Taylor on 18/09/2018 21:15:34

Richard Wills 218/09/2018 23:16:02
161 forum posts
7 photos

You can pop out a shield and check for lube, I do so on model offroad cars and replace the grease with a waterproof one, but that is a much harsher environment than an outrunner. I would not use oil, as it will fling out and you would need to re lube them often.

Unless you need the anti corrosive properties, I wouldn't use stainless bearings, they wear faster.

Geoff Sleath18/09/2018 23:49:53
3238 forum posts
247 photos

I would use Campagnolo waterproof grease because it's what I have left over from when I did a lot of cycle bearings but most proper bike shops will stock something similar.


Richard Wills 219/09/2018 00:03:10
161 forum posts
7 photos

Halfords do a decent own brand bike grease which works well.

Kim Taylor19/09/2018 16:26:05
254 forum posts
53 photos

Thanks to all for your thoughts on this.

Richard - my mistake, they're chrome steel, not stainless as I originally said. I blame senilitysmiley

I just wondered whether grease was the thing to use, with the speeds this will do (470kV on a 6s) or whether an EP type oil would be better (would need to be oiled each session or two though)

I've got various greases / oils in my garage that I can try - wouldn't cost much to try a few out and see (hear) which gives the best result.


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