trainer/tires

same here. tires are not that expensive.

This is what I do as well.

I had a separate rear wheel setup with a trainer tire.

But having since moved over to super heavy flat resistant tires for training...I find it works fine on the trainer.  Using softer tires...they would get eaten up in 15 minutes.

I didn't buy a separate wheel for it, but I did get a Vittorio trainer tire and put that on.  Knowing that my bike isn't leaving the trainer throughout all of winter, it wasn't hard to motivate myself to change it back in October.  I won't have to change it again until early April at the soonest.

This!   I found a cheap tri bike.  I even bought it without wheels and put some old ones on there with a trainer tire.  That bike is in the shop currently, but usually lives on my trainer.

I started out with a continental trainer tire that I swapped weekly, it was a PITA to put on the OEM Vista SL rims.  But I did get real good at changing tires and it saved me during a sprint race when I flatted!  Then I bought another used wheel(set, TTR3) and my OEM wheel is my dedicated trainer tire, it takes me less than 90 seconds to swap out the cassette.

When my old Rubino Pro slick tire was ready for replacing I put it on the trainer to see how long it would last.  40 minutes later I had rubber on the floor and cords showing.  That was one tire not to use on the trainer.

I have a seperate rear wheel with the same cassette as my race bike.

I just swap it out as needed. My bike spends a month/so at a time attached to the trainer during the winter.

I get my tires from the bike shop out of the trash. They'll toss me a couple of old scrap worn out tires and I don't care. They burn up and I get another.

I have nice Continentels for the race and I'd rather not burn those up.

I have old tires that have cuts in them that I wouldn't use on the road. Some of them unfortunately happened to be fairly new so I use those on my trainer now instead of tossing them. I have my stock wheels for my tri bike and have those on except for when I will be racing and then I put my race wheels on with other tires. 

So if you don't want to spend money on a trainer tire and you have been unlucky and cut your tire beyond wanting to use it on the road think about keeping it around to use on your trainer.

I use the same setup.