ridge runner

Hi, can anyone id if this is a 1991 Koga Miyata Ridge Runner frameset? I doubt that the decals are not original but I want to hear your thoughts. Thank you!

Recently I got some japanese Bike magazines / special issues giving an overview on parts and bikes in the early to mid 90s. You can find some pictures and scans in this album: https://fotos.mtb-news.de/s/96728 One thing that catched my eye is mountainbikes sold under the brand "Ridge Runner". I...

I've been meaning to start a thread for this for ages, just like I've been meaning to do about a million other bike things, including getting on with getting this built up. Here are the frame and forks and original wheels: I still need to strip and rebuild the headset and the bottom...