How do I know if my bottom bracket is worn out?

[Mazz]

lots of different sizes and compatibility. Pictured below is a threaded Hollowtech II BB. red is part number , yellow is sizes (thread pitch, axle diameter, and ROAD for BB shell width). You also need a (very cheap) tool to remove and insert.

Some are press-fit, (as opposed to threaded) fitting and removal tools more expensive and probably not a job to attempt if you don't know what you are doing as easy to damage your BB shell.
View attachment 730908

Thanks , I just checked mine and it's just like in your picture (only a bit dirtier):
Driveside SM-BBR60
Non-driveside BC 1.37 x 24 ROAD

 

[fossyant]

Oh the horror - look at the state of that bike.

If you unship the chain, give the cranks a spin. If they spin freely without any crunching or roughness you are OK. I'd have popped the cups out/re-greased the bearings by now, but that's me.

 

[Ming the Merciless]

It’s what happens to bikes without mudguards. Shortens life of components somewhat.

 

[Mazz]

If you unship the chain, give the cranks a spin. If they spin freely without any crunching or roughness you are OK.

Just tried that, nice smooth and quiet when spun, so all good 👍

It’s what happens to bikes without mudguards. Shortens life of components somewhat.

Mine's got mudguards, they've been on for years👍

 

[Ming the Merciless]

Just tried that, nice smooth and quiet when spun, so all good 👍

Mine's got mudguards, they've been on for years👍

Then why can’t we see them in the photo? Can you do a wide shot of bike to put our minds at rest.

 

[Mazz]

Then why can’t we see them in the photo? Can you do a wide shot of bike to put our minds at rest.

Those pictures were taken with the phone held directly below the BB. It was the bike equivalent of up-skirting.

 

[fossyant]

Look at this filth @Mazz

 

[fossyant]

I think the bike is lubed with dirt.

 

[Ming the Merciless]

Photos proving otherwise, or it hasn’t got mudguards fitted.

 

[Ajax Bay]

Cummon, chaps. The OP thumb wiped clean the bits of the BB with writing on. Which was the info needed.

 

[fossyant]

Cummon, chaps. The OP thumb wiped clean the bits of the BB with writing on. Which was the info needed.

Tisk tisk !

 

[silva]

I think the bike is lubed with dirt.

In Germany a Harley rider did that to receive more attention and it worked.