The AR40 is the latest addition to the Foundation lineup. Featuring an aerodynamically optimized 40mm rim depth front and rear with a 25mm internal rim width, the AR40 is designed to deliver ultimate versatility for the road ride and racer looking for performance on and off-road. Product Details Ultimate versatility for the on and off-road rider 1515g Wheelset Weight Avg. (+/- 3%) Inner Rim Width: 25mm Aero optimized tire size: 27mm* Tested and qualified to ENVE's gravel standards For Use With Tubeless Tires Only *Tire must be Tubeless and listed as "Approved/Recommended" on ENVE's Tire Compatibility Page. Build Specs SPEC TABLE FRONT REAR Spokes Sapim CX-Ray J-Bend Hub ENVE INNERDRIVE - Foundation ENVE INNERDRIVE - Foundation Hub Spacing Front: 12x100 | Rear: 12x142 Nipples Alpina Nylock Brass Spoke Tension 120kgf Brake Type Centerlock Dimensions PEC TABLE FRONT REAR Effective Rim Diameter (ERD) 579mm (+/- 3mm) Internal Rim Width 25mm Sidewall Width 3.6mm Pinch Flat Technology Wide Hookless Bead Hole Count 24h Depth 40mm Tubeless Tape Width 29mm Tubeless Valve Length 61mm 61mm Spoke Tension 120kgf Brake Type Centerlock Spacing Front: 12x100 | Rear: 12x142 Weights SPEC TABLE FRONT REAR Rim Weight 425g 425g Wheel Weight 690g 825g Wheelset Weight 1515g (Includes Tape and Valves - HG Freehub) Tire Optimization SPEC TABLE FRONT REAR Recommended Tire Size 27 - 50mm Minimum Tire Size 27mm * Maximum Tire Pressure for Min. Tire (psi | bar) 80 psi | 5.5 bar *Tire must be Tubeless and listed as "Approved/Recommended" on ENVE's Tire Compatibility Page.