Just normal 15/16 size wheels. I don't want to sound like a grumpy old man, but I've used two different places quite a few years apart for wheel balancing where I live that were highly recommended. Both times I had to take them back to get them fixed. Add in the fact I'm quickly coming to the point where I just think if I can do things myself, I'd rather (assuming time, affordability) because I've had so many times where I think jobs are half-as&ed. I happened to mention this at work the other day and I got inundated with similar tales!
Anyway, I thought I'd give a bubble wheel balancer a go, and assuming its accurate, *know* I've done the job.