London Fixed-gear and Single-speed

Do you use lockrings on miche Primato BB ? i.e does the whole BB fit inside the shell ?

Reason is i need to know how much room i have to play with,
since my cranks are quite close to the shell as it is.

If they don't have lockrings it's happy days because i have an extra 3mm on each side.

Currently my axle length is 120mm ish and i feel it's too wide and my knees are beginning to hurt after long rides.



i can't see no lockrings ?
i dont want to make the mistake of assuming they don't.
Thing is, how do they secure themselves if they don't have lockrings ?

I dont have one of these BB's

But standard Shimano etc, sealed BBs dont use lockrings.

The whole shell goes in, and holds itself under the tension of being tight. That is all.

there are no lockrings as such with the miche bb. the cups are not flanged either. they work fine most of the time but my bb started to rock in the bb shell no matter how much i tightened the cups so i replaced it with a campag.

My hypothesis.

In a cartridge BB, the cups push themselves against the outer edges of the bearing cartridge, eventually gripping due to the tension.

A looesball BB needs a lockring as the cups some into direct contact with the ball bearings. So tightening = bearings crushed.

Instead the lockring is tightened stretching the cup minutely, which pulls back and grips the BB shell.

right then.

miche primato it has to be then. i'll give it a go anyway. £12 is cheap tbh.

cheers chaps

Barrie Witcomb managed to get a lockring on my Mickey BB.

What tool do u need ? will a shimano lockring tool suffice ?
or is it those compaq BB tools i need ?
there are no "miche" BB tools that i can find.

thanks kowalaski

will this work ?



it has a pin in the middle so im a bit dubious, but i waould prefer a spanner like this.