I don't know the wheel or current tire sizes, I'll look tomorrow. The current tires are fairly thin with fairly small treads. Not a huge way off being slicks themselves if I understand what slicks are. So can I put some real slick tires on them if so do you have any recommendations, the cheaper the better. If I do put these on I assume my bike will become more road and less hybrid. So I should avoid more off road riding even if it's light. I generally only cycle on the road anyway with a bit of light gravel path stuff here and there. No where near real off road stuff like you would on a MTB.