The result of the change over on the 4-wheel drive trails was amazing. The Multi feels like a capable dirt horse except for deep sand where the small front tire will bite you if not careful.
I put TKC-80's on my MTS a couple of months ago, I bought a second set of rims for the knobbies so I can switch back and forth with my PR4's. Totally agree about dirt-worthiness, this bike is HEAVY for a dirt bike (especially at first and when full of fuel) but can be a lot of fun... I ride with KLR's and KTM Adventures and although I'm a lot more cautious than those guys I chalk at least some of it up to experience. I'm getting faster and more confident and have negotiated some fairly gnarly terrain.
Also agree with comments about SAND. The Multi is still squirrelly as hell on sand, that 17" rim is never going to cut it and 120 is pretty wide tire so... avoid, go slow, both feet down.
You do give up significant handling in the corners with TKC on the front so welcome to the big trade-off.
Huh, I am not finding this. I have been surprised, stunned actually, at how GOOD the handling is in corners. I was totally ready for a mushy-feeling front that is progressively harder to turn in or hold a line as speed and lean angle increase, but I am not seeing it. I'd say I can do at least 75% of what I can do on the street tires on the TKC's, at least while they're brand spankin' new. I'd never push them to high-speed leans like I would the street tires, but overall day-to-day dry street riding is way way way better than I anticipated. We'll see about tire life, I've had them on for awhile, maybe 1500km or so but they're so good in the dirt that's where I've been doing my long rides.
On the rear I don't really have anything to compare to, but I'll say that this bike on these tires is not what I'd choose for hillclimbs. Heavy bike, hugely fat tires for dirt and a sh#tload of power make for poor traction on loose scrabbly climbs. The rear like to dig itself in.
Out of curiosity, what are you running for tire pressure on the TKC's. I dropped mine down 5psi front & rear from recommended, so like 28 and 34 or something like that. The guys at the (mostly dirt) shop I got them mounted at recommended 25psi. If you're running that range of low pressure you will have much worse handling in turns for sure.
Somebody said in another post that these tires really bring out the Multi's capabilities and I think this is true: I can ride the twisties fast to the trailhead and have a ton of fun on the dirt. I only wish that it wasn't damned near impossible to put a 19" wheel on the front.
I put a belly pan protector on mine from strada adventurosa, highly recommend.