Bicycling - Shimano Road Bike Parts - Finding Part ID

Shimano compatibility charts come in handy for assembling your bicycle, planning purchases, or troubleshooting. This page gives some guidance toward finding the part ID of your components. You'll need the part ID to find a replacement or evaluate compatibility of something new.

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Finding Front Derailer ID

It's marked on the inside. The photo is taken looking across the bike from the left side through the spokes or through the gap between wheel and seat tube.

Finding STI Shifter ID

This was labeled quite small on the 6700 Ultegra shifters in the photo - it's not legible except from very close. The ID can be found under the grip casing, near the handlebar mount point. Another clue is if your shifter has a front cap, it should say "105", "Ultegra", or "Dura Ace" on that plastic cap.

Finding Rear Derailer ID

The rear derailer is marked on the inside of the cage near the spokes. The mark does not indicate GS or SS however (the photo shows RD6600, and this particular one is a long cage version). Triples will have a GS or long cage RD.

Finding Cassette Sprocket ID

Cassette sprocket ID is easy to find once you've taken off the rear wheel. It may be hard to read while still on the frame. There are also markings on some of the cogs to indicate tooth count, but it's easy to just count the teeth on a cog as needed. Usually a count of only the large cog will be enough to identify the sprocket.