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Here is a picture of a brand new never spun BSB Swiss bearing with the nylon retainer removed. You can see at the factory they just put a dab of grease on each one of the points in-between where a ball would go (2 of the points of grease stayed in the bearing but you get the idea) and when the retainer is inserted into the bearing the grease gets put (spun) directly up against the shield where if dirt was going to get into the bearing this is where it would come in.

This makes it very easy to re-grease a bearing as you put only a dab of low temperature (not high temperature grease) on each one of the points and your done. I have seen some people over fill a bearing with grease and then wonder why it won't break in.

When I put a brand new set of Bones Swiss in which is an oiled bearing within 5 minutes I can hear dirt grinding in the bearing. With the BSB I can go 8 months or a year before I hear a speck of dirt in the bearing. With both the BSB and the Bones bearing the balls and race come polished with a mirror finish (scratching the mirror finish will cause resistance) but within 5 minutes that mirror finish is gone with the Bones but with the BSB it will last a year if you don't go through water (if you do their instantly ruined) and push the grease and dirt into the race.

With the BSB you don't have to clean them, you just move the bearing to your new wheels being careful not to get dirt in the bearing from the inside (there is no shield on the inside). The BSB are packed with the perfect amount of low temperature grease (as opposed to a high temperature grease) which will liquefy at a low temperature. This is good in that if and when a race becomes dry (free of lubrication) and friction starts (which creates heat) the surrounding grease will melt and relubricate the balls and race.

This works well in that only the dry race will be lubricated one at a time as they get dry without you having to do anything. This leaves the race and balls with the least amount of lubrication possible before relubrication which ensures the least amount of resistance.

20 freshly oiled bearings will create more resistance than a broken in set of greased bearings that has only 1 newly greased bearing from the heat of a race that dried up and heated some grease into the race. After a year just throw your BSB's away and get a new set for $70 or clean and re-grease them and use them for your rain bearings.

Bones bearings are good if you have no BSB broken in and you have a race next week. Out of the box the Bones are a little looser than the BSB (no need to break them in) and being oiled they are race ready right out of the box (but your mirror finish would be gone 5 minutes into the race). Bones are also good indoors where there is no dirt to get into the bearing, outdoors Bones bearings just seem to be a dirt magnet.

If you want a bearing that will be like new a year after you start using them get the BSB Swiss bearing but remember the first time you go through water whether it's the first day or the 300th day the mirror finish is gone and their ruined.