Have a good recommendation for the K5?
You could write a book about tires. They all have a specific design and purpose, but it generally comes down to...
what type of terrain/soil do you generally ride in?...you don't want to spend $80-$100+ on a tire and have it wear out immediately riding in the wrong terrain than what it was designed for...
I generally ride in very soft and sandy track and trails with the occasional semi hard sprint across a powerline or dirt road in eastern Massachusetts....my 250 has an MH3 on it now, it works pretty good in sandy/soft terrain, but anything remotely hard pack and it sucks.
I decided to try a Maxxis IT on my 500 because a lot of guys highly recommend them on here...but, it has just a couple rides on it, and I'm not happy with it. The knobs are just too close together for my type of terrain, so it just spins instead of hooking up.
So far the tire that works best for my terrain is the Kenda Washougal....as pictured...

it's somewhat similar to the MH3, but the knobs are tall and spaced out a touch more, allowing it to really hook up in the sand and loam....and I've been impressed with how long they last, providing you stay in soft terrain!.
Now, just because me or anyone else suggests a tire, it doesn't necessarily mean it's gonna work good for you...you'll have to do a little "trial and error" until you find one that works best for your terrain.
Good luck...trying out new tires is fun and exciting!
