I've got a copy of the August, 1977 issue of Cycle magazine with a review of the MT125R. They ran it against a Yamaha TA 125, and reported "The Honda is superior in every way..." The motor was nearly identical to the MX 125, and the front halve of the frame was the same, but the rear of the frame was different from the dirt version. The mechanical front disc was from a CB 200, and the rear hub was from an S 90. During testing, it reached "about" 112 MPH. The biggest complaints were the high prices for the bike ($1764 retail), and the high prices for the MT125R specific replacement bits.