Thanks for your comment. I agree, there's a lot of context missing in my video. What I wanted to do was examine the idea of equal comfort between tire sizes and see if comfort and tire pressure are related. There are lots of theories out there, but they all seem rooted in assumption. Some say it has to do with casing tension, others say it's flex. We can say, "just set the pressure to the manufacturers' specs," but what is that and how does it relate to me, my weight, and riding style? There are tire calculators out there, but again how did they arrive at those figures? The idea of equal comfort was presented by BRR in their Continental tire test. The results of the BRR test was published after I made a series of videos looking at how a wide 650b compared to a narrow 700c. Whether I had anything to do with that, I don't know? At the time, I used equal pressure to try and hold as many variables constant. Many people believed (myself included) that wider tires were undoubtedly slower. After running my own tests, I learned to my surprise then that wider tires were as fast as skinny tires, even on smooth pavement, but at a novel 19mph. People chimed in and said that 19mph is too slow to test these tires because wind resistance would become a factor at higher velocities. Note, BRR ran their test at 18mph. For people who have followed my channel for a while knew I was digging into this subject out of curiosity, not to try and sell anyone on a particular tire or tire size. When BRR ran their test using equal pressure and then followed up with normalized pressures (e.g. equal comfort) showed that wider tires are not faster, namely when the pressures are set to create equal displacement. I adapted and ran my wide/skinny tire test on the road at pressures more suitable to the tires and found out they were still as fast. We have more or less the same results, but the wider tire is still faster on rougher pavement. For road racing the optimal tire is likely still one that is light and skinny for aero advantages, but wide enough to handle the surface roughness. TDF riders enjoy pristine pavement, we are not so fortunate here. However, despite the perfect pave at the TDF we are seeing width slowly increase. For me as nobody mixed terrain rider, graveleur, dirt tourer I still prefer the wider tires for most of my riding. Winning cups and prizes is not within my purview. I hope this helps a bit more with the context of this video. Where we are now (I think) is that casing tension doesn't seem to be a factor in tire comfort, and comfort is still a very subjective idea, but most people will agree wider tires are more comfortable. How they are more comfortable has more to do with shape, volume, casing flex and the accompanying pressure changes within the tire under a given load. Getting the comfort right is part of the equation for the ideal cycling experience. Of course more research on the matter is needed. Thanks for reading to the end. HWB

@@Henrywildeberry Thank you. you did a great job Mr. Yes, I've seen the BRR test you mention, about a year ago. I understand (I hope) them fully. So your "dots" story is also very interesting and definitely digs deeper into the subject. Once again - very interesting to watch.

Cool! Thanks for checking back.

Rim brakes are rad!

Thanks for watching!

Ms. Cools ate 2 so I figured if I ate 5 they would throw me in prison and let her walk.

Hi Tedyeo it's a Leyzne Road Drive in size large. They come in three lengths, small, medium, and large. The pump pegs on my frame were spaced for the large. I added a small spring inside the pump to keep it from poping off the peg. I haven't lost one yet.

Thanks! I just wanted to get off that road a fast as possible.

I thought it was simple too! Then I started to wonder why after 150 years we're still not quite sure how a pneumatic tire works 😂. Surely it must be simple, but simple like the Theory of Relativity? To me it's very complicated. LaPlace's law assumes air is compressible and in equilibrium (meaning it's not changing pressure due to volume changes, temperature, etc.) and therefore the internal forces between the air molecules are the same throughout. Using those assumptions, one can work out the container (vessel) stresses (e.g. casing tension) based on the pressure and the vessel's geometry. It was a really neat relationship and likely it came about at a time when engineers were designing a lot of pressurized tanks and hoses and tying to figure out how to keep them from exploding. On the other hand, applying external forces to a flexible pressurized vessel is where it gets complicated. Bicycle tires being a toroidal shape really complicates the math even further. Car tires at least are shaped mostly like a hollow cylinder, so calculating the geometric shape changes is not so difficult and the contact patch is nearly rectangular. With a bicycle tire the contact patch is an elliptical shape with its vertices related to the tire width and tire diameter. As the tire displaces its vertices are increasing at different rates, and the associated contact patch is increasing nonlinearly as we saw in the video. The compressible nature of the air allows the tire to change volume under loading which would therefore change the casing stresses too. Given the casing is stiff in tension it doesn't contribute to the vertical displacement of the tire. We can see this also by how increasing tire pressure from 20 to 120 psi doesn't lead to large volume changes (e.g. the tire is not stretching). Anyhow, it's a fun subject, and worth exploring because pneumatic tires are what make a bicycle fun to ride. Thanks for sharing your thoughts.

I couldn't agree more! Shimano is now selling mechanical cable actuated Deore model shifters for $22.00. These are very good shifters too, durable and reliable. The difference in effort to shift with these in comparison to a new electronic group to me doesn't warrant the cost of electronic. To me part of the pleasure is making it simple and seeing how well it works. You can always go out a spend a fortune and have something nice, but with bicycles you can make one without having too. Thanks for the comment!

Lower pressure does offer that. It seems it's the pressure along with the tire size (width), wheel diameter, grippier rubber compounds, and thinner casings that flex provides the comfort and control. Casing tension is part of the mechanics, but not to the degree we thought.

It's chocolate with sprinkles.

Thank you! I'm really enjoying the bike and the classic style.It rides like a dream.

Awesome! Thank you so much.

It's our favorite time of year. The leaves are just starting to change color, and the weather is perfect.

Glad you enjoyed it! Eddie knows how to have a good time.

I'd enjoy checking out that area one day. I've mapped a few touring routes through there. It looks really nice. I think your Masi will hang with the group no problem. These bikes are fast, and the handling on the descents are superb.

@@Henrywildeberry The climb up Alderpoint rd from Garberville, would be memorable. It is steep and very curvy in spots. Its kinda like a paved trail in some spots. As the climb starts to flatten some, there is a sign to the right, for a road going thru Harris, which is an old general store and some folks living out there. Its Bell Springs road and its mostly gravel with some pavemento here and there. 45 miles of Bell Springs, and it drops down onto 101 11 miles north of Laytonville......its a cool road and would be fun to pedal. In Laytonville you can take the left to Dos Rios, for more fun on gravel.................Poonkinney rd is a left after Dos Rios and more gravel that pops out maybe 2 miles west of Covelo. Ive been riding these roads for years and years.

Thorough and exhaustive research, well done!

If you really want to know what you "should" have, try some online calculators. Silca had one (I bet you did long time ago). As for me - go for what you like, not for what they tell you. I'll admit I have 72 kilos so for 25 mm tires I stick to 89-90 PSI, but for 23 mm ones I go up to 101-103. Whether Is it high or not it's not my problem. I got used to that and it's fine for me. Must say that when I moved to 25 mm tires, I felt like riding on a garden house, filled with water. 😁 Smooth. 28 mm? They say never say never, but no - not for me, as long as 23-s don't cause head ache, just put a smile.

The Sierra's is a nice mountain biking destination. Truckee is great too, but busier on the weekends. If Amtrak could work out how to allow bikes on and off there, that would really help.

I am not affiliated or associated with either of them. I would assume they have arrived at their respective suggestions through limited testing of the tires they like or sell. Not all tires are the same, so use the calculator as a starting point. Good luck.

If you know, you know.

He certainly isn't doing any riding though

👍