Geax Barro Mountain Tires: The Barro Mountain is a cutting-edge multi-purpose tire: aggressive, not too widely spaced knobs, for grip and good rolling. "Rails Design" side knobs, guaranteeing great reliability and stability when cornering. A standard XC compound (Aramid 3D) for size 2.10 and "Sticky Soft" (55 Shore A) for size 2.30. "Tuned Spring Rate" casing, perfect for XC and reliable for enduro. use: 2.10 on front and rear for XC races, 2.10 rear and 2.30 front for long-distance races and demanding terrain, 2.30 on both wheels for enduro and trail-riding.