The Optimus is for "down country", not a typical XC tread but designed for speed, climbing and also getting rowdy. Its close spaced blocks and fast rolling center is about efficiency and comfort. It gets good sized side blocks for excellent cornering confidence which manage speed and off camber sections well. Special endurance compound for excellent efficiency on longer wear times. True to size width 29" XC/ Endurance- 738g / 27.5 XC/Endurance - 698g Choosing the right compound and casings MoPo Compound - Softest compound 42a, has excellent damping characteristics and reaps traction in wet slimy conditions Control - Balance of MoPo compound with more durability and efficiency, still excellent grip in the wet Endurance Compound - Not as soft as the MoPo but does extend durability with a 50a/56a dual compound. If are killing your tyres in a few rides, the Endurance is probably the better choice. Trail Casing - 72TPI single poly, tubeless insert with nylon breakerXC Casing - 120TPI Single ply, tubeless insert
