DetailsThe Synthesis DH11 - I9 Hydra 27.5 Boost Pair Shimano is the mountain bike's first tuned carbon wheel system designed specifically for downhill riding. Each wheel, both front and rear, is individually tuned and optimized to meet the demanding requirements of mountain bike performance.The front wheel is compliantly tuned to improve handling and maximize grip and control in turns. This will give you the confidence to tackle any corner with ease.On the other hand, the rear wheel is stiffly tuned to support peak loads and enhance stability and tracking at high speeds. With this wheel, you can ride with confidence, knowing that it will provide you with the stability you need when pushing the limits.Specs- Engagement: 0.52º quiet engagement / six pawls- ETRTO: 585mm (27.5), 622mm (29)- Hub: Industry Nine Hydra- Inner Rim Width: Front 31.5mm, Rear 31.5mm- Outer Rim Width: Front 38.7mm, Rear 39.5mm- Rim Height: 18.75mm- Spoke Count: Front 28, Rear 32- Spoke Type: Sapim CX-Ray (front), CX-Sprint (Rear)- Warranty: Lifetime (rim only)- Weight: 1945g per set (27.5), 1995g per set (29)This Crankbrothers Synthesis DH11 - I9 Hydra 27.5 Boost Pair Shimano is the ultimate choice for downhill mountain biking enthusiasts. Experience superior performance and durability with these specially designed carbon wheels.