The best tyre levers out there
Reviews: Tools > Cycling Tools > Tyre Levers
Easy tyre fitting
Park Tools TL4C - Tyre Lever - Set Of 2
These Soma tyre levers have a steel shank running right through their plastic body to provide extra strength, but they're still thin enough to slip into tight gaps and get tyres off.
City and mountain bike tyres go on and off by hand as easy as Tupperware tops. Narrower road or touring tyres don't. Sure, with decent tyre levers, a bit of thumb strain and a dusting of talc, anything's do-able. But easy? Not always.