Thule Sidearm Universal Bike Mount

The Thule Sidearm will accommodate bikes with wheels between 20 and 29 inches, with tires up to three inches in diameter. This means you can take your new 29 rig to the trailhead alongside Junior's new 24 inch kid bike, and use the same rack for both. The Sidearm attaches your bike to your rack via one ratchet strap in the rear, and one arm on the side that slips over your tire and locks everything into place.