My rear derailleur hanger bent on a pothole in Denver and I rode home in one gear
Hit a nasty pothole on 5th and the hanger took a hit, so I used a spare hanger from my bag and a 5mm hex to swap it roadside in about 10 minutes, but now I'm wondering if I should keep a spare hanger taped inside my frame for every ride, has anyone found a spot that actually holds up?