THEN we could take the same successive approximation approach. For a wider tire at the same drop, you would expect a larger contact patch, and thus a lower psi. Just remember “Dave Adams” when you use it. The “pretend it’s a cylinder” method did its job, though. I’ve never done it, but I like it in every way. Outside of these ranges, decrease the pressure a couple psi for light wheel loads (or don't, since the difference between the optimal 36 psi and 40 psi for a 40 lb wheel load is likely not an issue, and your pressure gauge likely reads high anyway), and increase the pressure a few psi for heavy loads (or don't, since the tire is possibly being overloaded and you should consider getting a wider one instead). • Comment Policy The advantages of these extremely wide tyres include their incredible grip and outstanding suspension, even on rigid bikes with no suspension springs. Best done semi manually so you understand the limitations of your model and have awareness that, though the one you have produced might be the simplest best fit to the data you have, there are many others that might be statistically acceptable and possibly better reflect underlying mechanisms that are producing the data. *

For example, 90psi in a 25mm tire will feel the same as roughly 70 psi in a 28mm tire. Go pump your tires. However, this does not mean that the air pressure can be reduced indefinitely, since there are other import factors to consider, along with rolling resistance. By adding your contact info you gain access to more detailed inputs to help you dial in your tire pressure even further.

Huge Silca fan , had my pump for 38 years! Since: Where there is no tube, there can be no hole! It’s currently running 700c x 28mm GP5000 tires that actually measure 30mm on the Zipp Firecrest rims, and I’m guessing my total system weight is somewhere around 172lbs. The supplier Schwalbe has introduced a system featuring a small tube sitting directly on the wheel rim, which is pumped up to a higher pressure. Interesting tool.

On uneven tracks, this occurs several times per second and every time the tyres bump over an obstacle, momentum is lost. Here’s a clean XLS file you can download for your own use: https://www.biketinker.com/wp-content/uploads/2011/04/Tire-Pressure-salvaged-doc.xlsx, All this is very good, and I for one appreciate the think time that went into the original work as well as the commentary that followed. Along with the reduction in weight - which amounts to around 200 grams per tube - this puncture protection is another compelling reason for choosing this kind of system. This makes sense when you think we are dealing with PSI, which cause the size of the contact area. Whether you want to perfect your setup or just use our recommended pressures, you will quickly learn that tire pressure is the easiest and cheapest tune-up for your bike. That’s lower than I have been riding them, but not by much – I typically pump up to 75/74psi before each ride.

When using a tubeless systems, you can get away with less pressure - as low as 1.2 bar - assuming that you have a wide rim of around 27 mm. The “just right” belongs to the Baby, Bear, though–not the Mama Bear. I would expect this to be of most use for people with unusual tyre sizes, as the more common ones can usually be arrived at simply by experience of others. Thanks for the great explanation and tools. What I haven’t seen is anybody point out that for 23mm wide tires, the calculated optimum tire pressure in psi is essentially the same as the wheel load in lbs, within 5% for wheel loads between 53-198 lbs (<2% between 67-104 lbs). This app is intended to give you a starting point to that for all tires.--> A peculiar characteristic of tubeless tyres is that if the tight fit between the edges of the tyres and the rims is lost for even a short time under cornering, a leak can occur, causing air to escape, also known as burping.

I gave up on the Google doc a few months ago.

Studies have shown that, even on gravel tracks, lower air pressure is associated with reduced rolling resistance. Philip, The pressure calculator was created by Dave Adams, who sent it to me because of a tire pressure post I’d put up with an extended chart. Today, I just went to this online torus calculator, and calculated the volume of a 700c and a 26″ 45mm tire. What variable(s) would need to be changed to calculate for smaller wheel sizes?

You can open the spreadsheet in Open Office, Excel, or Google Docs and use it for free. Curious to see what it would recommend for me, I punched in the numbers for my Why Cycles PR road bike. Obsidian Monarch saddle customization and repair, a short overview of tire pressure on the Problem Solver’s blog, a tire pressure post I’d put up with an extended chart, Bicycle Quarterly had a “Tire Drop” article, RBW (Rivendell Bicycle Works) Google Group, http://l0z.free.fr/velo/pression-pneu-ideale-ISO.ods, Tire pressure calculator google doc | Bike Tinker, Separating the men from the boys with Compass Tires | CycleKabob, Separating the men from the boys with Compass Tires | Prima Cyclorina, 'Upgrading' to skinny tyres pointless for London commuting - Page 6 - London Fixed-gear and Single-speed, Have the Ball Boys Check Your Tyres - AEA Cycling Club, https://www.biketinker.com/wp-content/uploads/2011/04/Tire-Pressure-salvaged-doc.xlsx.

• Submit News Because of their obvious advantages, tubeless systems have achieved widespread popularity, and the number of tyres which support this technology is steadily rising. The great part of the spreadsheet is that I don’t have to really get the math! Just don’t give your actual email address. Wish I’d thought of that…, I don’t see the calculator accounting for construction, sidewall TPI, etc. Your email address will not be published. Bikerumor.com is the world’s largest cycling tech blog. Our passion is the products, technology and people that make them. Seems to me if I use the recommended pressuers (20% loweer than I run I will be squirming my way right into a pinch flat. According to Frank Berto and Jan Heine (of Bicycle Quarterly magazine), two top bicycle science guys, the most efficient bicycle tire pressure is one that gives you a 15% drop in tire height when you get on the bike. Since there’s no single pressure that will work for every rider, Silca has taken that pressure knowledge and packaged it into an online tire pressure calculator that you can use, for free.
Is the derived pressure really “optimal” if some tires are “much faster due to reduced damping (hysteresis)” ?

I’ll try to upload a clean download copy for you this weekend, but Maker Faire is going to take up all Saturday. People are just terrible. 4. Your email address will not be published.

Don't miss out on the latest offers & products - plus € 5 off your next order! As their name suggests Tubeless Systems have no tubes at all. Shouldn’t the pressure per square inch should exactly match the tire load in lbs when the tire is 25.4mm wide? The crossed-out prices represent our previous price.
Don’t forget to take in mind, that your floor pump might show not accurate figures. When I remember. • About Us, Review: MET Terranova open face trail helmet, Wahoo ELEMNT BOLT goes Stealth, drops in price, adds e-bike firmware update for all. When calculated for Worn Pavement/Some Cracks and for the Fast Group Ride setting, it recommends pressures of 70psi for the rear, and 68psi for the front. Finding the right air pressure is largely a matter of 'trial and error'. In beta testing we had the speed as a number input by the user and found that people were dramatically overestimating average speed which was both leading to overly high pressures and also was causing people to trip into the pinch flat warning too frequently due to over-estimating their average speed. It doesn’t seem to, though. I run same pressures front and rear, mostly. The “Ross” tab in the spreadsheet is for my low-trail Ross Super Grand Tour fixed gear tourer. The article listed the average pressure and some changes to be made depending on ground conditions or the ability of the pilot.

I should re-read the article again, too. This site uses Akismet to reduce spam.


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