Achilles tendon

Interesting Prime Heretic- calves do not hurt but I have never been happy with the pedals on my road bike- Time RXS.

It may well be user error but I've never been able to adjust them so that my pedallong angle is comfortable for a whole ride, which I have with ATAC's/SPD's.

Maybe I should get the Speedplay Zero's I actually wanted when I thought I'd save a couple of quid and get the RXS...

Yup that could well be it then. Probably a good idea to dump those pedals if they don't feel right, as people are saying proper tendon injuries can be serious.

Re Speedplas, I have some, they're ok kinda over hyped IMHO. Not really worth the premium you pay, what you save in weight on the pedal you gain in the cleats, also worst cleats ever for walking round, though in their favour the adjustment is very good. Maybe borrow some pedals and see how it goes?