More thread resurrection -- anyone who's dealt with this intermittently rather than all the time, what does/doesn't make a ride cause UTIs for you? I have only had mild symptoms of one a couple of times until this past weekend, when one derailed a 1000k brevet 400k in. (It definitely started within the first 200k, and I had no problems on multiple 200ks, multiple 300ks, a 400k, and a 600k this season at all; the only previous little inklings of ones were in previous years.)

My working theories are two: heat/humidity and the point in my cycle (PMS-y and expecting to start my period some time within the next 0-48 hours). Unfortunately, I can't control those, so I can't easily experiment to figure out what to change next time.