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Overview

Which Scott frames use the IDS 2 142/RWS12 dropout hanger?

The Scott Dropout Hanger Rightside IDS 2 142/RWS12 is the genuine replacement hanger for Scott frames built around the IDS 2 dropout system, which covers the Scale, Spark, Genius, Contessa, and Big Ed platforms along with their E-bike counterparts. Despite the 142 in the name, the same hanger serves frames running 12x142, 12x148, and 12x197 thru-axle spacing, because the RWS12 interface is shared across those widths. This is the right side piece only, meaning the drivetrain side where the derailleur mounts. Scott catalogs it under part numbers 219577 and 219574, and it ships with its screw and axle cap.

A derailleur hanger is engineered to be the weak link on purpose. When the derailleur takes a hit from a rock, a crash, or a shift into the spokes, the hanger bends or breaks so the frame does not, and a bent one is the single most common reason shifting refuses to index no matter how much barrel adjuster you feed it. Because hanger fitment is model specific and rarely interchangeable between brands or even between frame generations, compare this part against your existing hanger before installing rather than going by the model name alone. Keeping a spare in the workshop or the travel kit is the difference between a two minute repair and a ruined weekend.

All the specs

MPN
219577 (also catalogued as 219574)
Dropout system
Scott IDS 2
Side
Right, drivetrain side
Axle designation
142/RWS12
Thru-axle spacing served
12x142, 12x148, and 12x197
Frame platforms
Scale, Spark, Genius, Contessa, Big Ed, and E-bike versions of those platforms
Includes
Hanger, screw, and axle cap
Type
Genuine Scott replacement part

FAQ

Good questions

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How do I know if this is the right hanger for my Scott?

Compare it directly against the hanger currently on your bike. Hanger fitment is model and generation specific, and the model name alone is not a reliable guide because Scott changed dropout designs across years. If your existing hanger is stamped 219577 or 219574, or your frame uses the IDS 2 dropout with a 12mm thru-axle, this is the correct part. When in doubt, bring the old hanger to the shop and we will match it.

My frame is 148mm Boost, not 142. Is this still the right hanger?

Very likely yes. The 142 in the name refers to the axle designation, not a restriction. This hanger serves Scott frames running 12x142, 12x148, and 12x197 spacing because the interface is shared. Confirm against your existing hanger before installing.

Can I just bend a damaged hanger back instead of replacing it?

You can straighten one to get home, and a hanger alignment gauge does a decent job in a pinch. But aluminum that has been bent and bent back is fatigued, and it will fail again at a worse moment. If the hanger took a real hit, replace it. It is a cheap part protecting an expensive frame.

Why should I keep a spare?

Because hangers are model specific, nobody at a trailhead or a race venue will have yours. A bent hanger with no replacement ends the day. A spare in the travel kit turns it into a two minute repair with a multi-tool.

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