This is a 15" Aluminum frame we used as a 26" DH bike for my 12 yo son. It may take a 27.5" wheel. He used it until he was 16. Fox Shock is included, and uses a coil spring for someone weighing around 120 lb. You can use another and I have one or 2 options also.
This frame is made in USA, and is built like a tank. 12mm axle. 1.5" Headtube designed for a 1.5" fork or tapered.
-Frame only $295
-Fox Float R Coil Shock, 8.75"eye to eye, $175 (coil is for a lightweight person)
-Frame/shock includes cane creek headset, $495
-Frame/shock with Hammerschmidt cranks and XTR 9-speed derailleur, $650
Hammerschmidt Crankset is 175mm and works as a 24/36t, I used a regular front shifter. It is a 9/10 for condition of legacy part. Smart and reliable. $275 by itself.