Here is a good engineering artical on miniature bearings.
http://www.astbearings.com/bearing-t...on-levels.html
There are tolerance charts at the bottom. The charts are broke down by size of inner diameter. If you look, you will see that the tolerance differences are measuered in the 0.0000 of inch in difference between the levels. While that minute amount of difference could make a big difference to a Nasa engineer that needs a close to perfect bearing to avoid even a tiny amount of vibration, it won't make any difference in a fishing reel. What is so very hard to understand is that it's not the abec rating or the tolerances that they measure that has anything to do with how easy a bearing spins. Thats controled by cage design, ball materials, quality of ball construction, and how well the grooves are polished as well as if it's deep grooves or shalow grooves. In a nutshell, the best bearing for a fishing reel spool is a bearing that has very low friction. That comes from low contact cages and highly polished raceway grooves and smooth balls. You can get them in just about any abec rating, but most companies won't make them like that in less than a 3 rated bearing. If you look at the cages of a Boca OS bearing, you will see that there is very little contact between the balls and the cage, thats one reason why they spin so easy, the other reason is that ceramic balls are very smooth, it's not because of the rating. One thing people need to know is that you can buy a high rated bearing that isn't easy to spin at all, but it will spin smooth, just not easy. That bearing would be worthless as a spool bearing. Many here have noticed that the lightning bearings work good, they also have low contact cages and ceramic balls. My own spin tests show them to be extremly similar to the higher rated OS bearings in free spin times and ease of start up. I can't see any reason at all to use a more expensive bearing than that. My own tests have also shown that a stock shimano bearing that has been completly cleaned in a US tank until the solvent stays gin clear and then is treated with a very thin lube, those bearings also spin just as good. You see, Shimano has already specked their stock bearings to be low contact and to have very highly polished raceways. I personally would never take a perfectly good shimano bearing out to replace it with any other bearing, there just won't be any true gain. The key is to just get the best performance from your stock bearings that you can get. Clean them very good. If you don't have a US tank then flush them out with a spray can of brake cleaner. Just press the extension nozzel right against the gap and hose them out. then use a thin oil or some TSI301. they will spin better than most anyone can cast after that.
http://www.astbearings.com/bearing-t...on-levels.html
There are tolerance charts at the bottom. The charts are broke down by size of inner diameter. If you look, you will see that the tolerance differences are measuered in the 0.0000 of inch in difference between the levels. While that minute amount of difference could make a big difference to a Nasa engineer that needs a close to perfect bearing to avoid even a tiny amount of vibration, it won't make any difference in a fishing reel. What is so very hard to understand is that it's not the abec rating or the tolerances that they measure that has anything to do with how easy a bearing spins. Thats controled by cage design, ball materials, quality of ball construction, and how well the grooves are polished as well as if it's deep grooves or shalow grooves. In a nutshell, the best bearing for a fishing reel spool is a bearing that has very low friction. That comes from low contact cages and highly polished raceway grooves and smooth balls. You can get them in just about any abec rating, but most companies won't make them like that in less than a 3 rated bearing. If you look at the cages of a Boca OS bearing, you will see that there is very little contact between the balls and the cage, thats one reason why they spin so easy, the other reason is that ceramic balls are very smooth, it's not because of the rating. One thing people need to know is that you can buy a high rated bearing that isn't easy to spin at all, but it will spin smooth, just not easy. That bearing would be worthless as a spool bearing. Many here have noticed that the lightning bearings work good, they also have low contact cages and ceramic balls. My own spin tests show them to be extremly similar to the higher rated OS bearings in free spin times and ease of start up. I can't see any reason at all to use a more expensive bearing than that. My own tests have also shown that a stock shimano bearing that has been completly cleaned in a US tank until the solvent stays gin clear and then is treated with a very thin lube, those bearings also spin just as good. You see, Shimano has already specked their stock bearings to be low contact and to have very highly polished raceways. I personally would never take a perfectly good shimano bearing out to replace it with any other bearing, there just won't be any true gain. The key is to just get the best performance from your stock bearings that you can get. Clean them very good. If you don't have a US tank then flush them out with a spray can of brake cleaner. Just press the extension nozzel right against the gap and hose them out. then use a thin oil or some TSI301. they will spin better than most anyone can cast after that.
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