Maxxis DTH 26 X 2.15
To make it simple, I believe the Maxxis DTH is as close as it gets from the perfect street/dirt tire. It is made of soft rubber that gives it tons of grip on street and park while doing just fine on dirt. From what I've seen, the DTH is currently one of the most popular tires among street and dirt riders in North America. It comes in all black or with tan walls, 2.15" and 2.3", wire or foldable and is definitely worth it's price. Aside from the walls that could be a little thicker, there's absolutely nothing bad to say about this tire.
Kenda Komfort 26 X 1.95 Tire
You're probably thinking this is nothing but a cheap commuter tire, and you are right. I first discovered the Komforts years ago when looking through my local bikeshop's tires. I had just wrecked my tire, and I was desperate to find something I could use for the rest of the day. Little did I know that I would end up running Komforts for a long time after that. To this day, a bunch of Montreal riders still ride them, and Jeremy Menduni stopped using them about 2 years ago for no particular reason. At 1.95", they are the skinniest tires I've tried but trust me, they are pretty good for any technical street/park rider.
Kenda K-Rad 26 X 2.3″
The Kenda K-Rad is the first pair of decent tires I bought. I remember putting them on my bike and then trying them and that was it. I mean, I could carve the streets like I would've never imagined before and still had awesome grip on the dirt, thanks to the simplicity of their genius design. They have been around forever and still hold their ground. I've heard a lot of people say bad stuff about the K-Rad, but I still believe it's an awesome tire for anyone riding equal amounts of street, park and dirt. The most popular size is 2.3" which is perfect but it also comes in 1.95", 2.215" and 2.5", and it's now available in Wire and Folding Bead versions.
CULT x VANS 26 X 2.1 Tire
The Cult x Vans Waffle 26 Tire is a lightweight tire, suitable for any 26" wheels. It features the classic Vans Waffle pattern all over the surface, providing lots of traction in all situations. Besides being light in weight, it's also a highly durable tire with high-pressure sidewalls to minimise the risk of flats.
Resist Nomad 26 X 2.25 Tire
Since Resist is a FGFS brand owned by Volume/Demolition BMX, the Resist Nomad is the 26" version of the Demolition Momentum BMX tire. This tire is available for around 2 years now, and it's the best thing that could happen to Street MTB. Brian Castillo was kind enough to send a box our way last year and since I've put them on my bike, I feel like I can ride bowls twice as fast as before! At first, I was sceptical about riding a tire this wide, but their smoothness and grip convinced me in a matter of seconds. They're obviously not ideal for riding dirt, but I took them to the trails a couple times and if your jumps are packed enough, they do a pretty good job! The walls are super solid and you can choose either black or tan walls. Trust me, these tires are insanely good.
This tire is Discountinued