Blackbird Send Rim Specs 6061 Aluminum. Intended use: Mountain Biking. Internal Rim Width: 35mm (both Send 1 and Send 2) 5” Rim Weights: Send 1: 543g. Send 2: 590g. 29” Rim weights: Send 1: 565g. Send 2: 625g. 7‑year warranty. Single Rim MSRP: $99. Availability: Eventually (because, you know, supply chain)