I busted a thumb the other day fitting a new set of 23c Michelin tyres on some 23mm rims. I'm still suffering the effects.... I only find it difficult with new tyres, even with the Parktools levers I have used for years, so I ordered a set of metal levers. Very happy with them but you do have to be careful with them. Practice with an easy to fit tyre first.
Some rims like the pacenti make things very tough. The new pacenti are easier though.
The Parktools levers are very good too. I think I have ever broken 2 in many years. The technique is very important though, I just don't have very strong hands I guess.
I also have a pair or rubber gloves from Aldi that I wear when fitting tyres.... make it easy to use the palms of your hands to roll up the tyre.... a good technique with easy to fit tyres, like the same Michelin with at least 100 miles on them.
I'm having too fit tyres all the time now for people that ask for wheels with new tyres alreasy fitted or bring me wheels to fix with tyres already on. So I invested on a tool that goes by the name
kool stop tyre jack the tool does work but I'm not sure how long it will last. If it was made of metal then I'd be happier
