The Black bird Send Alu minum wheels are designed to elim i nate pinch flats and keep the tire sealed no mat ter what you hit. The wheelset is made up of a Send 1 rim in the front and a Send 2 rim in the rear. Both rims share a unique hol low box-sec tion bead wall that cre ates a broad con tact point with the tire, which is much stronger and reduces sliced tire sidewalls. The burly Send 2 rear rim includes a pair of ribs direct ly beneath the bead seat to keep them round after even the hard est hits.OEM new wheels just not in original packaging.The wheels spin on our house designed hubs, which feature four pawls and 36 teeth for 10deg of ultra reliable engagement. Tubeless ready out of the box with tape and valves pre-installed. Built with Sapim spokes and nipples so that spares are easy to source. Please note, logo hubs are ONLY 6 bolt rotor compatible