Just remember Dave Adams when you use it. 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. I agree with you. Curious to see what it would recommend for me, I punched in the numbers for my Why Cycles PR road bike. Fill in the yellow fields in the spreadsheet (tire width; bike and rider weight; percent of weight on each tire). Josh I see your reasoning Im just not sure its real world, an easy example are MTB tire casings, DH vs. XC same size tires will have different pressures. Having read the debate about 23 v 25 tyres I found a tyre pressure calculator which tells you what you should be running based on 15% tyre drop: Remember, as tire size and therefore volume increase, you can decrease tire pressure. I just kind of spitball another 10% off on my 26 tires. Dave Adams saw the post in his research on the same subject, and sent me a copy of his spreadsheet, which Ive been using ever since. Using your spring rate analogy/explanation, is the optimal pressure really optimal if different tires are much faster at the same pressure? * 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. Its important to find the right balance. 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. 3 LOL at the ridiculously over estimated average speeds people were entering! In my case its most always both, too soft and too short, lol. Finding the right air pressure is largely a matter of 'trial and error'. Bikerumor.com is the worlds largest cycling tech blog. Calculating Mountain bike tire pressure. Our passion is the products, technology and people that make them. I should re-read the article again, too. BTW, I agree that most of the mfrs info on the sidewall is not to be trusted, but it would be a Bad Idea to exceed the maximum recommended pressure on a tire by more than about 10%. This makes sense when you think we are dealing with PSI, which cause the size of the contact area. For better road holding capabilities, its best to go for the lowest possible air pressure. Regardless of what youve heard, the team at Silca has a massive amount of time invested in determining the ideal pressures for ProTour teams, Ironman Triathletes, plus Olympic and World Champions. You can make (copy) a tab for each of your bikes, and make the tires and rider fatter or thinner over time (or adjust for touring loads). As far as possible, its best to avoid these pinch flat punctures in the first place! This looks like a neat tool. A softer tyre will also sink more easily into uneven ground surfaces, which further increases the levels of grip. The algorithm was built by curve fitting these 4000+ real world optimizations, so if you want to calculate Peter Sagans Roubaix winning pressure, you can just enter his weight/tire size and cobbles and youll get his exact pressures same for Bettiols Flanders win, multiple Dirty Kanza winning pressures, and so on.. THEN we could take the same successive approximation approach. The advantages of these extremely wide tyres include their incredible grip and outstanding suspension, even on rigid bikes with no suspension springs. Since: Where there is no tube, there can be no hole! It didnt have a line for 35mm tires, which I used at the time, so I added another line, and extended it to allow for heavy loads. Also weighed out accurately to confirm the BQ numbers. In principle, the higher volumes of wide mountain bike tyres can sustain a lower air pressure without the tyres becoming destabilised. We love learning the technology and celebrating innovation at every level -from crowdfunded start ups to major global brands- and sharing it all here with you! Apparently calculating the volume of a torus is really complicated, so when I did this a long time ago, I just pretended they were cylinders. 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. As their name suggests Tubeless Systems have no tubes at all. That non-linear factor MIGHT be OK for different wheel sizes, but I have a nagging suspicion that varying wheel size would yet another non-linear component to account for a brand new set of torus shapes. 4. Like the calculator, but dont understand why avg speed input is in subjective categories instead of kph or mph. Your email address will not be published. 10%, 15% more?. Philip, Low-trail French Randonneuring bikes are different, with only 55% on the rear. So that the spoke holes are also completely air-tight, a special rim band is bonded into the rim base. Fat bikes with their balloon tyres are all the rage right now. A ISO tire size of 28-622 (which of course is backwards (b/c its European) from how we would refer to a 700 x 28C tire) has a tire width of 28 mm and a rim diameter of 622 mm. Try it now. Its goal is to identify the simplest mathematical formulas which could describe the underlying mechanisms that produced the data.. I run same pressures front and rear, mostly. If I relied on the experience of others, Id ride 25mm tires aired up to the number on the sidewall, and still be underinflating the rear which is a huge factor between brands/models. Doing the Maths the 26 tyre should be about 15% higher pressure than the 700C, if you spitball another 10% off you will actually be under inflating the tyres by 25% compared to what is suggested to get that magic 15% drop. A new system has recently come on the market, which combines the advantages of tubeless and tubed systems. 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. The narrower the wheel, the more pear shaped the tyre will become under pressure. When I remember. However, the air pressure cannot be lowered indefinitely, since this will have a negative effect on many factors, including the stability of the tyres on the rims. This tire is JUST RIGHT! Fifteen percent is the Mama Bear of tire drop. We'll answer in the meantime! Wish Id thought of that, I dont see the calculator accounting for construction, sidewall TPI, etc. By adding your contact info you gain access to more detailed inputs to help you dial in your tire pressure even further. Because of the high volume of the tyres, you can get away with much lower air pressure, without risking pinch flats or instability. Can you upload a clean, locked down version that people could just download or copy to edit? The inner tube ensures that the edges of the tyre press firmly against the rim, giving the system stability and protecting the rim from punctures. That includes details like the surface condition from indoor wood tracks to Category 4 gravel, wheel diameter, average speed, and the bikes weight distribution or type of bike. Ive never done it, but I like it in every way. Im surprised its that much, and hence surprised its not a variable in the spreadsheet. Since theres 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. At other times you'll find us in the mountains! Steps for optimising tyre pressure for mountain bikes. The pressure calculator was created by Dave Adams, who sent it to me because of a tire pressure post Id put up with an extended chart. My preference is for going fat, and keeping the PSI under 80. For a wider tire at the same drop, you would expect a larger contact patch, and thus a lower psi. However, the google doc seems to be ravaged by users. People are just terrible. If in doubt, follow this rule of thumb: as low as possible - as high as necessary. The Ross tab in the spreadsheet is for my low-trail Ross Super Grand Tour fixed gear tourer. Because the algorithm is fully mathematical, it takes each pressure calculation and compares it to an energy required to bottom out the tire in an impact and then will also warn you about pinch flat risk if you are using too small a tire for a given surface it will even give a recommendation for how much more pressure, or more tire width you might need for your weight/speed/surface condition. But its not just about the technology, your riding style also affects how much pressure youll need: If you are more observant, and tend to notice obstacles and avoid them, you can use a lower pressure than those who ride straight over everything in their path. It doesnt seem to matter that much with nice tires, and if youre running crap tires it doesnt matter that much either. Get your handlebar and front wheel perfectly aligned w/DNR Designs new Insider Interview: Zipp explains hookless tubeless rims for road bikes. Its since been updated with the correct link. Ill try to upload a clean download copy for you this weekend, but Maker Faire is going to take up all Saturday. Thats lower than I have been riding them, but not by much I typically pump up to 75/74psi before each ride. I gave up on the Google doc a few months ago. Info. Supposedly the calculator pulls from 4,000 data points from 150 athletes over the course of 5 years at 90 different events. You can open the spreadsheet in Open Office, Excel, or Google Docs and use it for free. This tire has too little air! Its squishy and hard to turn. To work out the correct air pressure for your mountain bike tyres, use the following approach: On level tarmacked surfaces the following rule applies: Higher tyre pressure means lower rolling resistance. The just right belongs to the Baby, Bear, thoughnot the Mama Bear. Although there are some basic rules of thumb for choosing the correct air pressure, every rider must experiment with their own set up. :). So if I take a GP5000 with butyl tube, GP5000 with latex and GP5000 tubeless tire and do a full optimization workup on them using field study, we will find that all of them yield the same optimal pressure result, but some of them are much faster due to reduced damping (hysteresis) as a result of tire construction. The Sitemap offers a quick overview of all content on this website. Time to drop some pressure for the next ride! The great part of the spreadsheet is that I dont have to really get the math! We cover the shiny new things, with in-depth interviews and detailed stories about how the bicycles and components work, plus reviews to see if they live up to the hype. Even slight differences in air pressure can have a significant influence on the handling; the best way to find out what works for you, is to try it for yourself! eval(ez_write_tag([[728,90],'bikerumor_com-box-3','ezslot_5',101,'0','0']));Ever wonder what tire pressure you should be running? Required fields are marked *. I made a French open document version (weight in kilos and pressure in bars) : http://l0z.free.fr/velo/pression-pneu-ideale-ISO.ods, Thank you for your sharing your work, Ideal tire pressure is subject to many variables such as road surface, weather conditions, bike materials and setup, rider's weight and lastly, riding style. It gives the tyres a larger surface area and means that a greater portion of the tread is in contact with the surface of the ground. Of course, in many of these optimizations, we are optimizing down with a 1-2 psi range most of the time, so it is possible that there is a <1psi delta due to casing, but it hides in the data both from a data set size and test resolution point of view. Youll note that even with just the 700c this needed a non-linear factor. Obsidian Monarch saddle customization and repair, a short overview of tire pressure on the Problem Solvers blog, a tire pressure post Id 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. Fill in the first place name suggests tubeless systems have no tubes at all percent is the Silca.cc link some! 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