Publicado Por En julio 22, 2026 YST Evolution 1 1/4 inch MTB thread headset RAR in SILVER BJ 1990 KULT YST Headset only suitable for frames with 1 1/4 "head tube - pay attention to the installation conditions and dimensions so that you don't make the wrong purchase. No Ahead is possible as a stem. The stem or Stem shaft must be a quill. Model features: Manufacturer: YST Model: Evolution Installation dimension of bottom bearing shell: 36.9 mm - Construction: external bearing shells suitable for 28.6 mm stems! Bearing type: ball bearing Bearing material: steel Material fork cone: steel Scope of delivery: as shown (NOS).