Rims sold individually not in sets. Tuned Front and Rear Alloy Wheel System for enduro riding and racing. Front and rear specific wheels tuned and optimized to address the specific performance requirements and loads of mountain bike riding. Compliant tuned front wheel improves handling and maximizes grip and control in turns. Wider inner rim width supports wider tire profile in front, increased volume and contact patch, and rounds tire profile to enhance turning. Stiff tuned rear wheel supports peak loads and enhances stability and tracking at speed. Narrower inner rim width supports narrower tire profile in rear, improves rolling resistance, and sharpens tire edge for grip. Welded and sleeved rim joint for additional strength. ERD 27.5": 564mm | 29": 602mm ETRTO (27.5) 585mm ETRTO (29) 622mm inner rim width front 31.5mm inner rim width rear 29.5mm outer rim width front 36.2mm outer rim width rear 34.4mm rim height 20mm Rim Material 6013 T6 Alloy spoke count front 28 spoke count rear 32 warranty 2 Years (rim only) Weight Per Rim (27.5F) 523g Weight Per Rim (27.5R) 525g Weight Per Rim (29F) 556g Weight Per Rim (29R) 560g