My shifter packed it in. Replacing it meant upgrading from 8-speed to 9-speed....which forced an upgrade of the whole drivetrain. Fortunately, we were able to get all this done at a super shop that let us get on the road by 12.30.
2 liters down on our water after just two hours of riding. No way we can complete a six hour loop. Lesson learned and we are heading back here in 120 degree + heat. Heart rates were pounding even when we were soft pedaling.