Quote Originally Posted by Eden View Post
Maybe I'm getting it a bit wrong... but kidney pain without noticeable urethra irritation (at least as a precursor) sounds fishy to blame it on the bike saddle? That there's been no saddle pain/pressure and no UTI like symptoms from saddle pressure makes me wonder.
I wondered the same thing. Also make sure you are staying hydrated. It is possible that you began riding but didn't increase your water intake. Something else to think about!