you can use the trainer without the trainer tyre and it will work just fine. the only thing is though, that this will wear down your rear tyre pretty fast. after about five sessions with a non-trainer tyre on my turbo trainer, the rear wheel was noticably balder than the front - so i invested in the trainer tyre, which i keep on my spare set of wheels and then i change the wheel each time i need the trainer.

the trainer tyres are good because they are VERY hard, and wear down slowly.

so yeah, it's not a necessity to buy the tyre, but its probably advised.

Ii used the adaptors for my 700c wheel and seems to work fine.

I use the Tacx Skyliner front wheel support, which is what they suggest on their website. It's small enough to not create any storage issues. I also use it to help store my bike upright when not in the trainer.

Hi, i've noticed a small amount of rubber on mine but nothing as drastic as yours, i think some rubber coming off is normal unless you use a trainer tyre???. Maybe it's how you have it adjusted or the quality of your tyre. I have a Hutchinson tyre on just now and it does appear to be ok although it is looking a bit "shiny". I have used my trainer about the same as you. I know it's not much but i hope it helps.

Yes, you can use for MTB or Road Bike.

No, as the rear spindle ends need to fit snugly into the trainer, which is why a special quick release is supplied.

I'm sure there would be, but I bet it is robust enough if you can take your bike out and that can handle it.

Looking at the instruction booklet the roller unit location can be altered by using parts Z or W to alter the position for smaller wheel sizes. Wheel diameter 610 - 640 mm: assemble heightening
piece W with 4 bolts, nuts and rings (fig.6 in the instructions).
- Wheel diameter 690 - 720 mm: assemble extension piece Z (fig.7 in the instructions).
Instructions can be found at tacx.com.