Part identification
Identify Your Part
Match the mounting tab first, then confirm housing width and wheel diameter. Start with the guide you need below, or jump straight into the Roller Finder.
Available now
Identify Tabs
Compare single-wheel and tandem mounting shapes. See what to look for, common mix-ups, and which collection to shop.
Open tab guideAvailable now
Measure Housing
How to measure housing width side to side so your replacement cassette fits the door pocket.
Open housing guideAvailable now
Measure Wheel
How to measure wheel diameter and edge profile so you order the right roller for your track.
Open wheel guideAvailable now
Steel vs Nylon
When to choose steel for load and life, or nylon for quiet travel and a gentler track.
Open material guide