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Yes.
Saddle adjustment should fix it quick (and shorter cranks is an effective saddle height reduction as it's about the maximum stretch).
On day 5 of Indypac, I woke up and got on the bike, and both my achilles were incredibly painful on each stroke. I'd put the cleats back the previous day and forgotten to drop my saddle. When, after riding 100 yards, I put my saddle down a couple of mm, all the pain went away instantly. I just had to stop it doing the thing that was hurting it - over-extending by x amount. Others say similar has happened with them.
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Ah wish I’d dealt with it immediately. Rode till the end of the day with the sore tendons, (10/15miles maybe) then did the entire journey back home (mixed; riding another 20miles maybe, train, walking etc). When I was back in London I actually dropped the saddle a bit but that really triggered a quite painful feeling in my left ankle for some reason so put it back to where it was and gingerly did the last coupla miles. Still sore a few days later but much better than it was
yes, by back do you mean more toward the centre of the foot? I think my saddle was quite high, and I was pushing on the pedals from more towards my toes. Hoping shorter crank, (would normally mean i need to raise my saddle if going from a long crank), adjusting foot position and saddle height will put less stress on my achilles. Spoke to the GP and they suggested I just chill out for a bit, don't think it's serious which is a relief too.