Endless 90 MK2 Frame — a precision-machined multi-setup 4x90 / 3x110 frame for 165mm urban freeride skates such as the FR1 and Rollerblade Twister, refined for improved power transfer and responsiveness. 150 / 165 / 180mm Mount. Standard raised-heel mounting for 165mm-compatible freeride boots. Recommended for boot sizes 40 (260mm foot length) and above. NOT compatible with UFS boots (including FR Skates UFR). 6061-T6 CNC Aluminum. CNC-machined from 6061-T6 aluminum — 310 g per frame for direct power transfer. Two setups, one frame. Balanced Rocker for the 4x90 setup; a flat 3x110 triskate configuration (bullet-profile wheels only). Frame specs: 276mm wheelbase · 150/165/180mm mount · setups 4x90 / 3x110 · Balanced Rocker (4-wheel) or Flat (3x110) · 310 g per frame (without axles and spacers). Brake compatibility: 4x90 — Powerslide Urban Brake M (may require modification) · 3x110 — Powerslide Megacruiser 125 or FR Skates 3W Brake. Includes: 2 Frames · 8 Axles. Sold as a pair. Best for: Urban · Freeride Skill level: All levels Fit notes: On Adapt skates the frame is not optimally centered. Size 47 (US 13) Twister Edge boots may need modification or a washer for 110mm clearance in the 3x110 setup (we recommend the Endless 100 for that boot size). Compatibility: 150 / 165 / 180mm raised-heel boots — NOT compatible with UFS or Powerslide Trinity.