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@heythropbikepolosoc
Amazing...So technically the fulcum five has a 15mm inner rim. Judging by Georg Boeger's chart, that allows for a 32mm tyre at the higher end of what will work. Unfortunately I ordered a 34mm. The true width of the vittoria's ordered (34mm), when inflated to 50psi, was actually 31.5mm according to various reviews. WINNING.
No new wheels needed for me then...