Good morning

I have an odd problem that has just developed during this year of training. I'm 57 and have completed numerous centuries over the years. This year, for the first time, my legs are cramping during training rides. During the first training ride of 45 miles I cramped at about mile 40. Two weeks later during a 60 mile training ride, I cramped at the 45th mile. I starting taking Hammer's Eletrolyte during the second ride but it didn't seem to help. For both rides, I stayed well hydrated because I didn't feel thirsty. I've signed up to ride the Tour De Cure in Reston on Sunday so I'm wondering if I should participate.

I'd sure appreciate any help.

Thanks.