Endless Coburn Frame — a 4x90 urban inline skate frame for 165mm boots, developed with Si Coburn and proven across street sessions, marathons, group skates, roll-ins, pump tracks, hill bombs, and skate parks. A royalty from every sale supports Si and his skating.165mm Mount. Standard 165mm raised-heel mounting — recommended for boot sizes 45 and below.6061-T6 CNC Aluminum. CNC-machined from 6061-T6 aluminum with an ultra-stiff structure derived from the Endless Ultra Series — maximum power transfer, instantaneous acceleration, and a predictable dynamic response for high-speed maneuvers and athletic jumps — a higher level of performance than the Endless Classic and MK2 frames.Balanced Rocker. Endless' acclaimed Balanced Rocker geometry delivers the perfect balance of stability and agility the streets demand.Frame specs: 273mm wheelbase · single setup 4x90mm · Balanced Rocker · 329 g per frame (without axles and spacers) · no brake compatibility.Includes: 2 Frames · 4 Ultra Washers · 8 Steel Axles. Sold as a pair. Best for: Urban · Freestyle · Fitness · Marathon Skill level: All levels "Sicodelic" edition: limited-run engraved artwork by Adam Weber Compatibility: 165mm raised-heel boots only (NOT compatible with UFS or Powerslide Trinity).