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@ewanmac
Hmmm yeah, I think it's the 38mm Michelin AirComp that I currently use, but there still isn't much space for my crack pipe. I almost broke the valve core yesterday.
I did find some super short butyl inner tubes that had a valve length of 20 something mm (24?) and they were a dream to pump but I can't remember the brand and I lost my entire supply when I dropped my toolkit in a race.