All safety classes provide bikes. I think mainly for insurance reasons.

They'd rather you muck up a Ninja250/blast/rebel than try and teach some genius who went out and got a brand new GSXR1000 with no riding experience. Who then grabs too much throttle and shoots into the roadway or harming other riders taking the course. Which would then get them sued.

But remember. Just because you pass the course doesn't mean you are ready for the road. Only you can be the judge of that.