The black TerraRunner combines a SkyRunner front triangle with a more economical Hardtlite steel tail. It is a upper-midrange bike. I gave the one in the pic to my father as present for his birthday. I still have another.
It could be your bike is a TrailRunner, but it is a guess. I don't know the Japanese line up.
Your bike is for sure a 1991 model. It is the reworked edition of the 1st generation Miyata bonded MTB frames. Modifications for MY91: tapered stays and slimmer dropouts (with al and carbon tail). Reworked, slimmer bracketlug with intergrated chainsuckteeth. The frame was now ready for a 1.125" headset and 73mm bracket, instead of 1" and 68mm. Rear spacing went up from 130 to 135mm. The gear cables were moved to the toptube. Seatstay bridge and brakebosses were bolted to the tail instead of welded (with al and carbon tail). A fitting for Miyata CO2 cartridges was added.
A completely new frame was introduced in 1992.
It could be your bike is a TrailRunner, but it is a guess. I don't know the Japanese line up.
Your bike is for sure a 1991 model. It is the reworked edition of the 1st generation Miyata bonded MTB frames. Modifications for MY91: tapered stays and slimmer dropouts (with al and carbon tail). Reworked, slimmer bracketlug with intergrated chainsuckteeth. The frame was now ready for a 1.125" headset and 73mm bracket, instead of 1" and 68mm. Rear spacing went up from 130 to 135mm. The gear cables were moved to the toptube. Seatstay bridge and brakebosses were bolted to the tail instead of welded (with al and carbon tail). A fitting for Miyata CO2 cartridges was added.
A completely new frame was introduced in 1992.