The Allroad SL's lightweight aluminum rims feature ISM4D technology, which strategically removes material from the rim where it's not needed but keeps it around the spokes, where tension is applied. Double butted spokes further reduce weight and make the wheel feel more responsive. The spokes have an aero elliptical shape that can save 5 watts of energy while maintaining your speed. Wide rims (22mm internal) are compatible with tubeless tires ranging from 28mm to 64mm for a smooth, efficient ride quality.Our UST system has been improved with a new rim bed shape that makes it easier than ever to install and change tires. Fore technology attaches the spokes to the rim without the need to drill the upper rim bed, so no tape is required. No hassles, no added weight (another 30g saved).Key Benefits:Ride smoother and faster on rough roads, gravel and dirt:- 22mm wide UST rims integrated for a smooth ride with a wide range of tubeless tires from 28mm-64mm UST Road Tubeless lets you run lower tire pressure for comfort and control on rough roads No tubes means less friction, better efficiency and grip, and pinch-flat protectionSuperlight and durable:- ISM4D rim weighs only 440g Patented lightweight aero spokes Automatic bearing preload (QRM Auto) requires no adjustment and guarantees long-term durability Fore drilling doesn´t require the use of rim tape - 30g saved per wheelLaterally stiff and vertically compliant for a dynamic ride quality:- Fore technology keeps the rim upper bridge solid to make the rim stiffer 17mm axle and new hub design ID360 freewheel technology is 12mm compatible, convertible to quick release (15mm axle option through axle replacement)Specifications:Rims:- Material: Maxtal- Height: 22 mm- Disc brake specific profile- Weight reduction: ISM 4D- Tire: UST Tubeless and tubetype- Internal width: 22 mm- ETRTO size: 622x22TSS ROAD- Hookless profile- Fore- UST- SUPTechnology:Fore tapeless tubeless technology: - Suifer and stronger Instead of being drilled. the lower rim bridge is pushed up on the inside. then threaded to enable the spoke nipples to be directly screwed in it. leaving the upper rim bridge intact.SUP welding technology:- Stronger and smoother joint Soudé Usiné Process. After bending. the rim joint is arc welded. The welded seam is then milled for a smooth finish.