Bosch Gen4 gasket?

[Randomscruff]

Hi there,

Can anyone identify what’s going on in the circled area of the picture. It looks like a rubber ring is poking out and is cracked. I haven’t had the cranks off the bike at all.

 

[Randomscruff]

Just to add another picture.

 

[JMD]

Just to add another picture.

View attachment 48041

There's a o-ring behind the lock nut, not a issue to run without it. Good idea to remove crank arm & check the lock nut (left hand thread 25-30nm)

 

[GrahamPaul]

It's Bosch part number: 1270016119

If you manage to find a reliable source of these at a reasonable price, please post a link.

So far, my experience has been "reasonable price = not available, please have one the wrong size" & "in stock = price will make your eyes bleed".