Freehub Spoke Protector
How important is this little plastic thing? I'm about to slap on the cassette on a 26er wheel and I noticed it doesn't have this.
All day long
It's basically a grime collector. Leave it off but be sure to set your limit screws properly as to avoid throwing the chain over the big cog and in to the spokes.
It is a little cheesy looking but its true purpose (as implied above) is to protect your spokes should your chain overshoot the largest (lowest) cog on your cassette. If you are confident in your ability to set the low limit, feel free to sh!t-can the protector.
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