Well for starters, you can always decide to do the metric instead of the full century. You can even make the decision after you start the ride.
I've been having problems with my right Achilles tendon lately, which was caused by some sandals I've been wearing a lot. It hurts when I wear the sandals and also sometimes while riding the bike. Stretching it seems to help, but not as much as wearing different sandals.
As for toes, I have to keep all my toenails very short to avoid painful toes on long rides. They look hysterical with nail polish, like someone drew lines on my toes with a Sharpie.
BTW, I would ice the Achilles tendon.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles