I’m sure bags are bags when it comes to stiffness as it’s the air that’s supporting you not the rubber, surely that just holds in the air. An empty bag that is just rubber won’t hold up anything.
I’ve fitted bilstein and arnott and thought the bilstein was ok Arnott are the ones I prefer. Both are far better than the eBay £30 ones. Pretty sure Arnott are linked to continental tyres too which is no bad thing as there a premium brand in the tyre world which is rubber.
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