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Trying to find a rear derailleur hanger that works with the Shimano Claris R2000 8 speed, on my REI Co-op bike. Have done lots of searching on Shimano's site and Amazon and Google. What am I missing? I think Shimano doesn't have branded/proprietary hangers; if that's the case, how can I find another brand of hanger that I know will fit?

If helpful, the bike specs here: https://www.rei.com/product/106309/co-op-cycles-ard-11w-womens-bike.

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    See this question for an example of a solved query: bicycles.stackexchange.com/questions/60163/… – Swifty Apr 15 at 7:42
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    The mounting bolt on derailleurs is standardized to M10 , so all derailleurs will mount on all hangers (or frames). As answers say, it's the frame end of the hanger that is different on different frames – Argenti Apparatus Apr 15 at 11:05
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Derailleur hangers are specific to the frame, not the derailleur. Do you not have a hanger at all or is it just broken? If it's broken, then it's usually not too hard to find a matching aftermarket one from Wheels Manufacturing or derailleurhanger.com. Have you contacted the manufacturer to see if they sell it separately?

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The hanger is part of the frame, not part of the groupset/derailleur.

If its a REI house brand, they will be able to supply exactly the right hanger.

Depending on price, you might consider a second as a spare for your on-bike toolkit. Remember they're "mechanical fuses" to protect your bike frame and to some extent the rear mech from further damage.

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