I am 53 years old and am slowly changing my MTB biking venue to 75% hardscape and 25% off road - and that is pretty much on nicer dirt trails. Anyway, I want to switch out my knobbies so I am safer on the street but still have something I can use on dirt on occassion. A search on the internet suggests the following: Hutchinson Acrobat or Rock 'n Road, Avocet Cross K 32, GEAX Evolution, Panaracer High Road, or Kenda ATB. I can't fix my own flats so I want something that won't leave me stranded and still retains the MTB tire look. My current MTB tires are 26-195. I want to spend about $25. If you ride your MTB like this and have a good experience with a tire, I'd like to know about it.
As long as your 25% offroad isn't too soft or muddy, then I think the Maxxis Wormdrive would be good. They are UST though, so you'll either need the UST rims or you can just run them with tubes. I've been running them tubeless for about 6 months and they've been very good. Fast and comfortable on hard/paved surfaces. But on loose surfaces, well, they really do suck. But I think that's the compromise you must accept with semi-slick type tires. Btw, they are consistent with the MTB look.
If youo are just going to be riding fire roads off road, the Specialized nimbus can be a cosideration.
I use them & i consider them good tires.Slip & slide=fun
Yeah I run 1.5 Nimbus's on one of my wheelsets and they are awesome slicks. If you want bigger, but still semi-slick, check out the 1.95 Specialized Hemisphere's. They are decent on road, and you can deffinetly take them off road as well.