The benefit would be a shock that is fully adjustable. And 30 bucks. And for me, one that doesn't have 52k miles and bounces like a pogo with rebound full hard. Honestly I'm not confident with "professionals." they don't know how you ride, especially if the shock was coming off a 919. There's no point rebuilding a non adjustable, non serviceable shock in my opinion. And the cost for going to a serious specialist that could probably do it right is so much you might as well get a new bike. Realistically any mods on a 919 I feel is like diamonds on doodoo. Saying that, I'd still like to spend 5k in mods one day just because I love the bike. But, every time I start to think I'm beginning to out ride the bike, I realize it was just me riding improperly. I'm starting to think that better suspension doesn't make a better rider, instead it just masks mistakes.
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