Endless 80 MK2 Frame — a precision-machined multi-setup 4x80 / 4x84 / 3x100 frame for 165mm urban freeride skates such as the FR1 and Rollerblade Twister, refined for improved power transfer and responsiveness. 150 / 165mm Mount. Standard raised-heel mounting for 165mm-compatible freeride boots. Recommended for boot sizes 40 (260mm foot length) and below. NOT compatible with UFS boots (including FR Skates UFR). 6061-T6 CNC Aluminum. CNC-machined from 6061-T6 aluminum — 274 g per frame for direct power transfer. Three setups, one frame. Balanced Rocker for the 4x80 and 4x84 four-wheel setups; a flat 3x100 triskate configuration (bullet-profile wheels only recommended). Frame specs: 255mm wheelbase · 150/165mm mount · setups 4x80 / 4x84 / 3x100 · Balanced Rocker (4-wheel) or Flat (3x100) · 274 g per frame (without axles and spacers). Brake compatibility: 4x80 — Powerslide Urban Brake S (requires modification) · 4x84 — Urban Brake M · 3x100 — Urban Brake L. 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. For size 46 (US 12.5) and larger Twister Edge / XT models, boots may require modification for 100mm clearance in the 3x100 setup. Compatibility: 150 / 165mm raised-heel boots — NOT compatible with UFS or Powerslide Trinity.