sorry to be a killjoy but if it was me (which it is not, i know--) i would NOT do the century so soon after an episode of acute tendonitis - your ankle does not sound like it is healed yet, despite having managed a 38 mile flat ride and I would hate for you to really set yourself up for a chronic tendonitis situation or even permanent damage by doing a century when it is still not properly healed--

batsheva, RN