A common complaint by folks who try their hand at installing their own tires is just how hard it is to do it. It's not taking the wheels off the bike that's rough, it's installing the new tires onto the rims...
I've been running Metzeler Interac M5's for some time now, enough to have installed 6 of them (or so) over the last year. They are a 110/70/17 tire which means they are actually wider then the stock tires. This alone makes them tough to install but, in the specific case of the Metzeler's, they are a mordern high-performance tire designed for high-horsepower litre bikes. This means, among other things, that they are Z-rated which means they are really, really stiff. I just about broke my wrist installing them once and the other day I had to get rid of some worn tires and my father was doing his annual brush burning so...I hucked a few on the pile
Here's what I found out later though. One, that fire ran for 12 hours and it was really, really hot. I mean, stand next to it and you'll start to burn. Red hot coals, bonfire size. In short, with temperatures that high there should be nothing, and I mean nothing, left of those old Mezeler's.
Instead, after everything was said and done, I got to see first-hand why those tires are as still as they are, and, just a little of the German 'over engineering' that makes these puppies grab so well...and..also why they nearly break my wrist every time I install them....
Here's a shot of a new install on the rear of a Metzeler Interac M5 taken when I was loading it up DynaBeads last year...