Find your perfect tire pressure for road, gravel & track w/ new Silca Pro Pressure Calculator
Aug 11, · Rider weight, normal riding position, riding style and road/atmospheric conditions all need to be considered too when calculating tyre pressure. A kg cyclist taking their bike to the smooth Author: James Bracey. A thin road tyre would have bar of pressure, much like a road bike (have a look at our tyre pressure calculator for road bikes), while for a fat bike tire, a pressure of bar will suffice/5(K).
Ever wonder what tire pressure you should be running? Supposedly the calculator pulls from 4, data points from athletes over the course of 5 years at 90 different events. By adding your contact info you gain access to more detailed inputs to help you dial in your tire pressure even further.
Curious to see what it would recommend for me, I punched in the numbers for my Why Cycles PR road bike. We used a link that was through facebook. Try it now. That is a beautifully simple way to describe the interplay between tire volume, construction and pressure. Mg — Think of tire pressure as the spring rate in a suspension system and the tire construction as being the damping. So tire construction plays a major role in rolling resistance and handling as it affects the dynamic response of the tire in rebound which can be critical to comfort, but as the casing of the tire is generally working in compression, the addition to spring rate of the tire is at most equivalent to fractions of a PSI of pressure increase.
So if I take a GP with butyl tube, GP with latex and GP 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.
XC casings, the different sidewalls work better with hyre pressures even though the sizes can be the same. XC same size tires will have different pressures. We just see that the slower tire is always slower, and that the curves for the slower tire are steeper either side of the break point. This is another reason to run supple tires, the penalties for being too high or too low are less.
Thanks Beverly, 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.
So we used the Strava speed data to develop these categories which mathematically assume a distribution of speed around pressurr normal value that then uses some how to hang three panel pictures modeling to judge pinch flat likelihood.
Interesting tool. Would be interesting to see the underlying maths. This site uses Akismet to reduce spam. Learn how your comment data is processed. Sign in. Log into pressyre account. Forgot your password? Password recovery. Recover your password. Get help. Time to drop some pressure for the next ride! Why is the Silca. Huge Silca fanhad my pump for 38 years! LOL at the ridiculously over ppressure average speeds people were entering!
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How Much Pressure Road Bike Tire Should Have
Dec 05, · Schwalbe does one of the best jobs of providing bike tire pressure ranges based on both weights and widths—though the weight ranges are pretty wide. Also, while Schwalbe does make tubeless tires, they don’t post a recommended inflation, but knock about psi off the range for tubeless. 25 mm lbs. Let’s say you had bike tires that are 23 centimeters or about nine inches. You weigh pounds. That means your tire pressure should be pounds per square inch (PSI). Let’s do another example. Jan 12, · Here are air pressure requirements for different types of bikes: Road bike tires are narrowest and require between 80 and psi air pressure. Mountain tires are flatter and they need an air pressure between 30 and 50 psi. If your bike has hybrid tires, you’d have to maintain the air pressure between 50 to 70 psi.
Proper tire pressure lets your bike roll quickly, ride smoothly, and avoid flats. Narrow tires need more air pressure than wide ones: Road tires typically require 80 to psi pounds per square inch ; mountain tires, 25 to 35 psi; and hybrid tires, 40 to 70 psi. To find your ideal pressure, start in the middle of these ranges, then factor in your body weight. The more you weigh, the higher your tire pressure needs to be.
For example, if a pound rider uses psi on his road bike, a pound rider should run closer to psi, and a pound rider could get away with 80 psi. Never go above or below the manufacturer's recommended tire pressures, which are listed on the sidewall. Tires leak air over time. A properly set up tubeless tire, and tires that use butyl tubes the most common type , leak far less than lightweight latex tubes. But air seeps out of all tires, from as little as a few psi a week to drastic drops overnight.
And the rate of loss increases with pressure and in reaction to outside factors like lower temperatures about 2 percent vanishes for each degree dip in Fahrenheit. Some of us at Bicycling check pressure before every ride, some once a week. And always check the pressure the day after you repair a flat with CO2 canisters. Carbon dioxide is highly soluble in butyl rubber nitrogen and oxygen, which make up 98 percent of our atmosphere, are far less so , so it basically permeates right through the tube wall, and fast.
In fact, if you flat early in a ride and fix it with CO 2 , check the tire again after an hour or so—it will probably need topping off. Traditional wisdom says that higher tire pressure equals lower rolling resistance, because on a smooth surface, hard tires flex less and create a smaller contact patch. But no road is perfectly smooth. Properly inflated bike tires conform to bumps and absorb shocks.
Overinflated bike tires transmit impacts to the rider, which sacrifices speed and riding comfort. On new pavement, your tires might feel great at psi, but on a rough road, they might roll faster at 90 psi. In wet conditions , you may want to run 10 psi less than usual for improved traction.
More isn't always better. The general bias is almost always to overinflate. While rolling resistance does increase with lower pressure, several studies show that across various road tires, rolling resistance increases only slightly, on the order of a few watts of power , even at pressures down to 60 psi on standard road tires. Then, consider that rolling resistance makes up only a tiny fraction of the forces we have to overcome most is either wind resistance or, on hills, gravity.
Here are some sample pressures to consider:. Please note, these samples are just a guideline. If you run tubeless, you can scale down even further, about 10 - 20 percent in some cases. And gauge quality varies; it may be off by a few psi or as much as psi. The fix: Get a separate gauge. A needle-type Presta gauge is simple, affordable, accurate, and durable. Other brands also makes low-psi versions 30 or 15 psi for use with mountain, cyclocross, and fat bikes for better resolution.
So it stands to reason that you should be running proportionately less pressure up front. Experiment with tire pressure by deflating front and rear, say, 5 percent each percent, not PSI, because remember, front and rear are different and should be changed proportionately.
Ideal tire pressure gives you a comfortable ride with a confident feeling in corners. Once the front wheel starts to feel the least bit squirmy in hard cornering, add a few psi back in.
Measure front and rear with your gauge and write it down as a baseline, but remember—the perfect pressure may change according to conditions, terrain, weather, and if you switch tire sizes or brands.
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