Correction: I originally posted these as E-09... they are actually E-07. They just arrived from MX1 Canada today and I'm excited to try them out, as they've been getting rave reviews in various ADV forums as excellent all-rounders (50/50 dirt/road) with terrific durability.
Front is a 90/90-21 in the Dakar version of the tire, which in the Mitas line means it incorporates a stiffer sidewall than non-Dakar versions. The Dakar versions are recommended for bigger DS bikes. While I'm putting these on my WR250R, the regular version of the front was not available and hopefully the Dakar isn't too stiff.
Rear is a 120/80-18 in non-Dakar version.
The knobby on my front wheel is an MT-21 with about 3,000km of mostly dirt riding.
These Mitas tires incorporate Kevlar fibers to increase tread durability. Riders consistently report getting well over 10,000 km out of a set of these tires, which is insanely good mileage -- especially when you have to flog it on long sections of pavement to get to the good stuff.
Will post a more detailed review once I get these mounted up on my second set of wheels.
MX1 just received a major shipment from Mitas in early April, so selection should be good.