American Custom Bicycles in Steel, Titanium and Ti/carbon mix

Thru-Axle and Adjustable Dropouts

Polydrop Thru-Axle Dropouts

Seven Thru-Axle Dropouts

Rocker Dropouts

Rocker Dropouts

Slider Dropouts

Slider Dropouts

Seven offers two thru-axle and two adjustable dropout options for cyclists who want to run a single speed, or internally geared hub, while using disc brakes.

Seven Thru-Axle dropouts

Seven’s Thru-Axle dropouts are designed and engineered in-house to provide the most durable platform for our S, SL, and SLX level disc brake bikes. They are natively flat mount, and can be incorporated into any width rear triangle.

Polydrops are modular thru-axle dropouts that come with or without fender mounts and can accommodate multiple disc rotor sizes. These come on our steel Thru-Axle disc brake bikes.

What are adjustable dropouts?

In order to add tension to the chain, a requirement for single speeds, adjustable drop outs allow the rear wheel to be slid or pivoted once fastened. By moving the wheel away from the crank set, chain tension is increased.

What is the difference between the Slider and the Rocker style dropouts?

Sliding dropouts slide back and forth and have the disc caliper mounted in the traditional, behind the seat stay, location. People who want a simple solution to a disc brake single speed often choose the slider drop outs.

Rocker dropouts pivot and require a low mount disc set up. This set up allows for easier installation of a rack and fender because the disc mount location won’t interfere. In addition, the rocker drop out allows for a 12 x 142 mm thru axle should you want additional stiffness in the rear wheel.

Thru-Axle come with or without fender mounts and can accommodate 140 or 160mm disc rotor sizes.