Anybody swapped the bearings on a Rotor BSA30 ?

[LouisN]

My BSA30 BB bearings are shut. I'm thinking of switching to some "better" bearings.
So I'm asking you guys, who has already did the bearing change on these cups ?
Did you keep the Rotor covers ? Other better options ? This BB will go on my TT bike, looking to bring it to lowest friction, best performance as possible.

Louis

[alcatraz]

My plan is to replace with NTN bearings, with two kinds of seals. Non contact towards the inside of the shell and low contact on the outer.

I wonder if changing the grease could improve performance. Like use a low fill rate of ceramicspeed grease maybe? I don't know...

[JoO]

My plan is to replace with NTN bearings, with two kinds of seals. Non contact towards the inside of the shell and low contact on the outer.

I wonder if changing the grease could improve performance. Like use a low fill rate of ceramicspeed grease maybe? I don't know...

The ceramic speed grease is faster as measured by friction facts. The downside is you need to re-lube and clean often. Lifting seals also increases the chance of damaging it.

Since you use bsa threaded cups. It might be an idea to have a race day optimised bb for little money.

[jeanjacques]

I did it, it's possible like any push bearing bottom bracket. I replaced them by Wheels MFG angular contact, some creaking because I think this bearings need a high compression, difficult with the new Rotor Aldhu ring. Also I'm wonder about the water/grit protection of this kind of bearings, I'm now considering to go back to 24mm spindle.

[ChiZ01]

30mm spindle on BSA BB shell sounds expensive and troublesome, 24mm shimano cranks are dirt cheap on eBay

[Attermann]

30mm spindle on BSA BB shell sounds expensive and troublesome, 24mm shimano cranks are dirt cheap on eBay

Why?

[1415chris]

Since in BSA the bearings are located in the cups outside the bb shell, it allows to use normal, full size berings 42x30, so no problems here.