Kenda 760 Trackmaster on the front. I only have a 4.0-18 K270 on the rear...it looks VERY skinny! I'm bumping it up a size on my next tire...which I don't know what it will be at this point. I haven't yet ridden the bike in my new surroundings (other than on the road a little).

 

Quick update. I'm down to 6mm of the 11.5mm tread depth on my k270 rear tire... in just 900 miles. At this rate it will be gone in less that 2000 miles. Hardly the high mileage tire others have claimed it to be. Maybe it's me, but I don't know how guys on bigger bikes are getting 5-10k miles on them. It's been a good tire for me otherwise.

 

I have hardly touched mine (K270) and I have 1000 miles on it. I ride hard on the road (I live on a great curvy mtn road) I accelerate hard, brake hard, even when I'm still running low air pressure after trail rides.
It may be that I only weigh 135lbs soaking wet, maybe 150 w/gear on, that they are lasting for me, maybe it's the increased size I opted for, I dunno.
They do make a lot of noise compared to the stock tires, not so crazy about that, but so what?.
I still can't believe I'll get more than 5K out of them, we'll see...

 

I'm around 190 lbs. 900 miles... 50% gone. It performs well, just wears fast. Not sure I want to go to a true 50/50 tire or a 70/20. I want it to work in the dirt.