Did you have a brake/did you use it?
I think a brake is a decent chunk of what stops my knees from hurting. I use it on my 36” for basically all slowing down. It doesn’t matter how slight the slope is - if there’s anything that would require backpedalling, I’m putting the brake on.
I use my brake extensively to avoid backpedaling. When I go downhill my legs basically just coast along and the brake controls the speed. @PedalSprell That’s possibly the reason why I was faster than you on the downhill with the 150mm cranks. But it also means that all the strain to my knees comes from uphill riding - which I have to do plenty of around here.
Fixies are awesome to ride, you can just go with the flow of the traffic, if you look ahead you rarely have to use a brake (which I had on my fixie, also to make it legal). However, that’s mostly true for flat rides. Uphill the strain on you knees is a lot higher than on a unicycle because since you don’t have such a low gear (1:1) as you do on a uni.
I agree, fixies are great to ride. I have ridden one extensively as well for a few years now. Mine has a very big front wheel and a tiny back one. 
Yes, brakes make you faster downhill 
“Ayo, what ratio are you running?”
“Oh, a 52 and a 20.”
“A 52/20? That’s a funny gear ratio—”
“No, those are the wheel sizes.”
“Wait a minute…!”
I snapped this on an early morning commute to study for an exam this morning. Never a dull moment when you’re on one wheel!
but you say nothing about what distance you rode…
Three 36ers, three different frame designs. What a lovely picture!
I stopped earlier than the other two. I rode 8.2 miles, 13 Km. I think they rode 12-14 miles.
And just on cyclepaths or also along the road with cars passing by? I try to choose roads with separate bike paths, but some sections that is impossible. Car generally dont stick to the speed limit in NL
The majority of the ride was on the blue line cycle path that is shown in the photo. There was a half-mile section of the trail that was under construction, which required us to leave the path and ride on the road with cars. However, that stretch of road was in a residential neighborhood so the speed limit was slow (30mph). We encountered cars passing us from both directions, but there weren’t any issues. One rider chose to ride on the sidewalk next to the road, but he acknowledged that it would have definitely been a smoother ride on the road. The sidewalk was not level, and it was very cracked.
How long did your ride take?
I sometimes go on 10-20 mile rides with the 28", and it takes about 2 hours.
Just curious how much faster the 36" is.
you could just put shorter cranks on your 28" to compensate. On a ride where i do say 20 kmh on 29"/75mm on 36"/100-125mm i could do like 23 kmh. 36" is also more comfortable at high speed.
Only compare yourself to me, if you want to make yourself feel good 
I’m not the fastest rider on the 36”. Many of my rides on my 24” Large Marge purple Uni average 7.0mph. So, I think I must have a mental “comfort zone” of 7-8mph. I haven’t ridden the 36” much this year. As I ride it more, my speeds will get closer to 9mph (I think).
Only you would think of 75/28 
That’s almost a 30mm difference from what I have. (114)
I’d say it’s a fairly standard combination
Your stats look very similar mine on a distance ride. And yes 8 miles is a distance ride for me and these days 10 would be extreme and 20 out of the question. My average on my 29er is around 6.5 to 7 and I lerk up yo 8 to 8.5 on the 32 when I’m on flat straight rides where I can get into a real groove without stops, traffic concerns or real climbs or decent. I am quite happy to ride at 7 mph I am quite in control , enjoying my surroundings and if I’m out for an 1.5 to 2 hrs I will have done 8 to 10 miles. I’m just about to turn 57 and I’m quite greatful I can turn those numbers. Longer rides I reserve for my bicycle rides which I love emensely also.
I concur with those unicycle ride distances, but I haven’t touched my 2-wheelers in years. My boy is only 4 years old so I can’t really go for longer rides with him and then I just take a smaller wheel uni. My daughter who is now 12 hates bike riding through and through, so every time I mention going for a ride it turns into a drama.
When going to the skatepark to practise my UW, they play with the longboard (skateboard)
Most of the time when riding uni, I have to do it alone and I can ride for as long as I want to, generally up to two hours.
