evo.com | Kuat Rear-Mount Bike Racks > Level up your biking adventures with the Kuat Piston Pro 2-Bike Add-On Rack, effortlessly doubling the excitement by accommodating up to two extra riders. The user-friendly and frame-friendly modular design makes it easy to attach the extra trays to your Piston Pro rack, and the adjustable arms let you accommodate bikes of all sizes for RAR rides and family excursions. FastFit(TM) Wheel Chock System It's called FastFit(TM) for a reason: This patent-pending feature changes wheel sizes from 18" to 29" seconds, tool-free. Stainless Steel Hardware All Metal Construction Compatible with 2" Piston(R) Pro Platform Rack Carries Two Extra Bikes, Four Total with Base Rack | Kuat Piston Pro 2-Bike Add-On Rack 2023 in Black