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There probably is a grip shifter but there's definitely rapid fire ones and they are definitely better.
There are versions of Shimano's 8 speed hubs which shift in both directions so you need to match the shifter to the hub somewhat if you want the numbers to match up.
If you post the part no from your hub we can post links to the correct type of shifter.
If you buy a new rapidfire I think itll come with a new cable and maybe the anchor bolt thing from the end. There are instructions on how far to set that from the end of the outer cable but in my experience it'll always need a bit of fettling to get it dialled in and line up the yellow marks.
If you're going to own an 8 speed hub you'll want to get familiar with aligning the yellow dots as if they get misaligned your hub internals won't last long.
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M_V
chris0
I have a Shimano 8 speed nexus hub. Came on a bike with drop bars and so shifting is via a bar end shifter. Thinking of changing to flat bars so would need to change to grip shift. Has anyone done this? I'm guessing I'll need to reinstall the cable and set up and adjust the shifting etc again. Never worked on a hub gear before so have no idea what I'm doing so just wondering how complicated it is.