One of the most aggravating things about my '06 SJ FSR was having to constantly stop and pick out the various debris that gets caught in the rear derailleur and prevents you from shifting up. Not any more! Used the same design to keep the mud and tree sap off the rear shock as well.
For a larger view see this link:
I seriously doubt this is an original design but I've never seen it before and just thought I'd share.
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Thread: Homemade mudflaps for the SJ FSR