RockyMounts MonoRail Add-On for 2-inch Platform Hitch Bike Rack – Expand Capacity

Expand your MonoRail system with a dedicated Add-On

The RockyMounts MonoRail Add-On for 2-inch platform hitch bikes unlocks additional carrying capacity without compromising on security or ease of use. It is designed to work with the MonoRail and MonoRail Solo, letting you adapt to longer road trips, weekend family rides, or group adventures.

Key benefits at a glance

• Expands capacity: 2" MonoRail becomes a 3-bike rack; MonoRail Solo gains space for a second bike
• Front-wheel securement with no frame contact keeps bikes safe during transit
• Fat-tire friendly: tires up to 5" wide and wheelbases up to 49" are supported
• Practical weight considerations: per-bike limit reduced to 45 lbs to maintain stable hauling
• Assembled weight of the Add-On is 37 lbs, with straightforward two-bolt installation

How it fits into real-world riding

Imagine a family trip or weekend canyon ride where four bikes need to travel together. The Add-On makes it feasible to carry two longer bikes alongside your existing rack, or split capacity with a second rider using a MonoRail Solo. The front-wheel-secured design minimizes frame contact, making it a versatile option for a mix of road, mountain, and fat bikes.

The tray can be adjusted 2" side-to-side to prevent interference between bikes, and the whole system remains accessible for loading and unloading without excessive fiddling. Simple 2-bolt installation means you can bolt it onto your existing MonoRail or MonoRail Solo quickly, then step back to check alignment and fit before hitting the road.

Who should consider this Add-On?

If you frequently travel with multiple bikes or want to expand capacity for longer groups, this Add-On provides a flexible, practical upgrade. The combination of fat-tire compatibility and a generous wheelbase range helps you plan rides that include a wider variety of bikes.