OK all, hoping for some advice and information...been riding since August but just started training for a century scheduled for the Spring. I've gone through the initial saddle soreness when I first started and up until now, I have been really comfortable and happy with my set-up and saddle (PB forte pro). Just last week I rode 40 for the first time and somewhere around the 3/4 mark, my left sit bone really started to let me know it was hurting (really hurting). Ironically just the week before I rode 35 and did not experience anything like that at all (smooth sailing). Is this normal as I increase my ride length? Does my body just need to get used to that long on a saddle like it did when I first started out? Is there something I need to try (lotions, gels)? Do I actually need to consider a different saddle for such a longer length?