un71 confusion

[cce]

Maybe logically. But Not actually.

 

[Rampage]

Surly it should screw inwards in the direction you pedal so as not to work loose?

Because there is a bearing between the surfaces it's the opposite.

 

[lewisfoto]

Surly it should screw inwards in the direction you pedal so as not to work loose?

Because there is a bearing between the surfaces it's the opposite.

I always wondered about that, now it makes perfect sense!

 

[Woz]

On all the bikes I've had the DRIVE SIDE has tightened up ANTI-CLOCKWISE (ie lefty-tighty).

The NON-DRIVE-SIDE has tightened up CLOCKWISE (ie righty-tighty, aka the "normal" way).

you said you unscrewed the non-drive side and the bottom bracket popped out?
Usually with the Shimano sealed bottom brackets the main body is screwed into the BB shell from the drive side, and the plastic or metal "sleeve" is screwed in from the non-drie side.

Maybe it had been installed incorrectly?

What frame is it in?

This. AFAIK there are exceptions - UN70 and some from the early lower LP range had the removable plastic cup on the DS. Italian is threaded clockwise on the DS - which this most certainly is not and it would be difficult to bodge since the diameter is larger than BSA.

 

[retron]

Surly it should screw inwards in the direction you pedal so as not to work loose?

Because there is a bearing between the surfaces it's the opposite.

Ah I see now, the bearing switches the rotational direction of the cranks.

Cheers

 

[retron]

Well my giant nrs bb driveside and non just tightened up clockwise to confuse me, and no I didn't take it apart just to test lol, had some bearings to change.