1. Durable Construction for Stability: These folding rollers are made of strength aluminum alloy and ABS plastic, providing a longlasting and stable platform for indoor cycling. The design minimizes vibrations and enhances your focus and performance during workouts. 2. Adjustable for Various Bike Sizes Featuring an adjustable front wheel holder with seven distance options, these rollers accommodate a wide range of bike models, from 24inch to 29inch mountain bikes and 700C road bikes, ensuring versatility in your training. 3. Efficient Performance Design: Equipped with symmetrical cone bearings, these rollers reduce friction and kinetic energy loss, delivering a realistic riding experience while minimizing tire wear for better balance and safety during use. 4. Compact and Easy to Store: Weighing only 8.3 kg, the telescopic design of these rollers allows for easy transport and storage. They can be conveniently folded and stored in tight spaces, keeping your living area neat and tidy.