Just got home from a ride to Tiny Town Colorado. I would guess they are around 7500-8000 feet. I only felt I had to pedal at one stretch for about 100 meters or so. That was it. I did not have to pedal, but I did anyway. I was very surprised at how well the 1.25 roller climbs. My Top speed under power has now hit 33 mph. Top speed coasting home almost 40. I can cruise 25-27 all day and the engine will not break a sweat. Rear tire has lots of small or medium knobs that do a lot of humming against the pinch roller. Loud humming at times. The ideal tire I feel would be a Solid top with knobs on the sides. I ordered a couple of different style tires to test. They should be here in a week or so. In the meantime, I will run the stock knobby tire and see what kind of miles I get from it. I am seeing peak wear on the knob edges. I have around 100 miles now on this stock tire. Climbing up hill, very steep at times, from Chatfield to Tiny Town yielded me 105mpg. No kidding. This is great !!! Coming home was all coasting. I should be over 150 mpg on the ride home ! Wow !! So.. This is where I am at now. Around 100 miles on the bike and tires. 70 miles on the BMP modified. Weld is holding well !! Enjoy the ride...