Weakness + cramp sounds more like nutrition problems than bike setup (but could be anything really). A lot of people get cramp when they start to become dehydrated.
How much did you eat and drink during your ride?
I'd guess 35 miles would be over 3 hours? For that sort of time in the saddle, I would probably eat at least 3-4 cereal bars and drink 750+ml water.
I did wonder this.
I probably drank 2l+ out of my camelbak, plus more at the feed stations. It was water with those High5 tablet things in. Plus things like flapjack, peanuts etc and a couple of energy gels along the way.

couldnt pedal. Put some hot water on it which worked for 30 mins but ended up pushing most of the trail! gutted! had no tools in car. Turns out the bearings and everything are screwed though. Llandegla not to far from me (45 mins) but still well annoyed! Was my first time there aswell 