BMW must have looked at semi-liquid sealants, O-rings, diaphragms and a host of other ways to seal
I must say fixing the spokes outside the rim seems the obvious and easy way round it - or cast wheels of course (which I read somewhere are lighter on the t/l GS650 compared to the tubed 800 - could be wrong).
Lashings of B&Q silicon sealant under the rim tape sounds a good and reverseable bodge (as the best bodges are) but I wonder if there is some alloy corrosion (the vinegary smell) or outdoor temps ageing element in the silicon? Maybe some gasket compound would be better but whatever, it would be prone to lift off with centrifugal forces at speed unless the rim tape was a giant hose clip.
Anyway, Tubliss seemed to have engineered a neat solution. With that the centrifugal (which I didn't consider before) is broadly with you.
Thanks for the SP on the Airman pump - landfill it is then. Still Screwfix sounds like a good place for a wander and it's right next to Ikea for the Mrs - everyone wins!
Ch
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