I had 705s on my KLR. I REALLY liked them.
I’d characterize myself as a very proficient off-road rider, and my KLR was generally a pavement commuter. I keep a bonafide dirtbike for dirt stuff. I live in Phoenix, so my experience is dry desert and sandwashes.
From my perspective, the 705s were competent on flat dirt and gravel, assuming you are comfortable letting the KLR be a little loose under you, riding with the lower half of your body, and not prone to riding with a tense deathgrip on the handlebars
I’d be reluctant to ask too much of 705s going up hill, or holding a line going down hill or off camber. Being skilled enough to carry momentum and know precisely where you can apply power or brake within the traction capabilities of the tires will be relatively critical if you venture off of flat dirt/gravel with 705s.
For instance, you’ll have to see & know that you need to need to carry extra speed to hold a specific line going down hill and braking won’t be an option until you hit the flat at the base. Also, if you want to climb a hill you’ll need to start with more momentum, commit, and rely less on grunting your way up.
Whereas a better off road tire will be more forgiving, let you brake or accelerate more in the above scenarios.
The 705 will have a lower friction coefficient at the rubber/road interface off road, versus a true knobby. You won’t be able to ask as much of the 705 as you would a true knobby. BUT, you can alter your riding style to minimize what you ask, by maintaining momentum, etc.
You gotta decide whether your intended terrain and skillset makes the 705 a viable option for you.
I loved the 705s, but I asked very little of my KLR off road, and I have a couple decades of experience racing AMA national harescrambles, the WORCS series, BITD, etc. I never dropped my KLR or worried enough to put crash bars on it. I had no illusions about the KLRs power/weight ratio or suspension limitations. My KLR weren’t no KTM. Why even bother with knobbies? BUT a KLR on 705s can shred the urban jungle like no other… around traffic, over curbs, through potholes, over road debris, with excellent sight lines from a high vantage point. The 705s were happy and smooth doing WOT for hours on the I-40 for 500 miles a day.
If I lived in the backwoods, and had to travel 6 miles of rutted dirt road to get the mail every day, then I’d have a KLR on knobbies with a milk crate bungeed to the back. Perfection for that scenario, but It wouldn’t be going on the interstate though, and it would still be crappy on trails by true dirtbike standards.
A set of 705s is pretty cheap. If they look good to you then give ‘em a go. I’ve wasted more than the cost of a set of 705s on a first date that didn’t put out. You can do a lot worse for your money.