I am in the mountains NOW on my 120 lb rhinocerous, LOL. With a 46/16 ROHOFF14, 36T is LAUGHABLE. Since noon May 18, I have done 630 miles, thru Calgary, Banff, Golden, Revelstoke, Sicamous. 2 rest/ laundry days. Sunday I had to do the whole 94 mile Rogers Pass with 4600 ft climbs, that is like 3x Hai Van passes Da Nang to Lang Co, that I did in 2014. The lodge/ cafe in the middle is permanently closed. I got hot and tired as hell, so I walked a couple miles rather than uselessly slog at 4 mph. IMO using derailleur is a HUGE mistake. I haven't even bothered to lube my covered chain yet. I am also 64. I also did 88 miles to SW Calgary the fourth day. My Rohloff now has 12,180 EASY trouble free miles. My SMP tires now have 8,000+ miles. I also have a XL SA Dyno DRUM brake on the front with 20,000 miles, NOTHING is better. MY rear brake is IRRELEVANT.