Old 03-10-20, 05:12 PM
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On steel frames, the rear dropout is both hard and "tough" so it can withstand the quick-release scraping but the hanger is tough enough that it can also be bent back numerous times before they break. Aluminum dropouts were heat treated to a high degree to get sufficient hardness to withstand the QR stresses but this made the hanger too brittle so they just made it detachable. A broken steel hanger is very rare - even steel MTB bikes use non-detachable hangers so a gravel bike will be fine.
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