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thanks, i have similar feeling about mine so decided to put 21C there and use it as training wheels on track. for road use i'll build another set. i'm lucky to have few nos old rim sets, perfect for everyday riding.
stromo-
Thats odd becuase the base tape on a 25mm tub is the same width as on a 23mm tub. So yes you can glue a 25mm tub to an 18mm rim but the curvature of the rim might not be ideal. For example mavic gel280 rim dont seem to have a profile that is ideal for any tub it tried had to use a fair bit of glue to get the edges of the base tape to stick.
cycleclinic
I emailed Corima regarding a wheelset I recently acquired; their advice for my rim (19.2mm width) was 23c max and they advised against trying to glue a 25.