Joined: Feb 2012
Posts: 19,353
Likes: 5,471
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Rear dropout slots horizontal to the ground are about maintaining the geometry regardless of the axle position within the slot, say when track riders change out cogs to suit the track and retension the chain. Angled dropouts are about maintaining the rear brake reach as the axle travels along the slot. Or that's what I was taught. Andy
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AndrewRStewart