I got this bottle to reduce downtube drag on race day. I lost 4-6 ounces in volume, gained a few grams in weight, but flew down the hills. I have a 54cm S-3 Cervelo and this bottle wouldn't work without adjustment bar. The Wolf Tooth Components B-RAD Mounting Base worked for me. The XLAB Aero Cage Optimizer Versatile Mount was too big for the tight space and weighed twice as much. I got the white one to be able to monitor inside cleanliness. This bottle is expensive, but worth it if you want to reduce downtube water bottle drag.
