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Shock oil seal 2 piece vs single piece

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Does anyone know the functional difference between an oil seal with a plastic back up ring and one without?

They both have a similar lip design.

They are both ars brand seals

The backed up seems more common in fork cartridges.

I guess what I'm asking is what the pros and cons of either design is.

 

Thanks

Aaron 

 

 

 

kyb-fork-cartridge-seal-1.jpg.a2da5cadcb716e14ffaf2ef2495d23d4.jpg

22-411-02.jpg.c49978f8cd8582acedfdba6c0f5325c5.jpg

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I should specify that this is on a mtb where friction would be much more noticeable.

The one piece is standard showa spec and the two piece is kyb spec.

12.5mm deals for 65 - 85cc bikes 

Edited by EnglertRacing

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