Pitting On Upper Fork Bushing

Branch · Mar 13, 2018

I'm doing my first fork rebuild and the kit just arrived, I was struck by how heavily pitted the upper fork bushings are - is this normal? I'd like to get a second opinion before sending them back for replacements.

kommando · Mar 13, 2018

It's not pitted, it's made from compressing metal powder into shape and then fused by heat, a process called sintering. The pitting is the gaps left between the powder particles, very useful for oil retention.

Frankie17 · Mar 13, 2018

Kommando is correct the material used for fork bushes is oilite which is a form of sintered self lubricating bronze all those lovely holes retain lube for smooth operation
they do look a little crude but still possibly the best material for application

Branch · Mar 13, 2018

kommando said:
It's not pitted, it's made from compressing metal powder into shape and then fused by heat, a process called sintering. The pitting is the gaps left between the powder particles, very useful for oil retention.

Frankie17 said:
Kommando is correct the material used for fork bushes is oilite which is a form of sintered self lubricating bronze all those lovely holes retain lube for smooth operation
they do look a little crude but still possibly the best material for application

Thanks for letting me know guys, I've been researching it just now and it's fascinating. So glad I didn't send an angry email to the supplier!

Pitting On Upper Fork Bushing

Branch

kommando

Frankie17

Branch

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