I think the toughest hill I've ever had to climb was somewhere between Irasburg and Lowell in Vermont (44deg49'12 N / 72deg21'24 W, top elevation at about 493 from about 250).
That was during the Grand Tour in 2006. It was pretty short (less than 2km I think) but awfully steep!! In a way much worst and a 23km, 5% ascent I have done in France! Thankfully I have a triple crank so I was down to 5km/h at some point. I just kept plugging away at it and eventually made it to the top. That really really made me happy!!



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Because it follows a one-lane bridge full of HUGE potholes, you have to basically start it from standing still, too.
