Had a shocking time converting my SS CX race bike out of its SS supercommuter camouflage on Saturday evening. Couldn't get the rear tyre to seat properly... it kept blowing a bead and herniating (including one extraordinary kaboom which brought the wife running), or sitting eccentric on the rim so the tyre would rub on one side or the other every rev. Finally got it fitted straight, and put a gentle ~30psi in it to hold shape overnight and help seat it properly.
Riding down to the station on Sunday morning, I noticed it was getting very soft. Stopped for a quick pump, and it was leaking out faster than I could put it in. Figured I'd fix it on the train, so started my CX training reigeme with a quick run to the train... which closed its doors in my face and pulled out of the station without me. Missed it by less than the proverbial "this much".
Turns out, it was probably for the best. My flat was due to the wire bead of my rear tyre coming free and skewering the tube. Even after breaking the offending couple of inches of wire off, there was no way that bead was going to securely hook into the rim again... I would have been on the train to Melbourne with a bike that's one tyre short of rideable.
So, I walked it back home, rolling on the rim. Considered taking the car (which Mrs Barefoot had been planning to use all afternoon), but that would have just had me running late for registration, running on the assumption that somebody at the race would have a spare CX tyre to sell me once I got there, driving 3 hours for a half-hour race that I'd be lucky to finish mid-field.
Converted my supercommuter back out of its CX disguise, one knobby tyre back on the rack and the other in the wheely bin. Will have to find a new tyre before the next one.