Bet you won't do that again. Something similar happened to me (though it was only ~5 miles) on my very first ride on my brand new '03 giant ocr1, the bike that got me started into...bikes. I figured I wouldn't flat on my first short ride. Wrong. It was 95 degrees or more that day too. Now I always carry a flat kit unless I'm urban riding and my car is parked nearbye.
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"