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Pretty bastard hard....I inherited the 23mm when I bought the wheels, will change to 28/30mm once it's worn out. I did use a plastic lever, I realise that might stretch the bead. The tyre wasn't new, but it went completely flat and after I took it off there was a hole in the rim tape, so I re-taped, probably using Tesa that was too wide in hindsight - presumably that isn't catastrophic now?
How hard/easy is it to mount tyres?