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If it's the plastic moulded rim strip I'm thinking of it doesn't need to seal to the rim - the tyre and the rim strip form a sealed unit, where the only possible means of escape is the valve hole. If there's sealant underneath the rim strip (assuming it's the moulded plastic type) then the only possible point where the sealant could escape is the valve hole.
Brommers
M_V
When I pulled the strip off it got all stretched and distorted because the sealant and oxidisation was effectively gluing it to the rim.
I hoped putting the tyre on with a tube might flatten it out but it didn't.
I'm slightly worried a new rim strip won't seal properly because between some old hardened sealant and bits of oxidisation the surface is a bit uneven in places, especially up in the bead/hook kinda of area.
The strip is less than a tenner so it's worth a shot I figure.