3 Riders enter measurable data like their weight, tire width, rim width, tire system (tubed, tubeless or Procore) and which of Schwalbe’s tire casings they’re riding. I’d say the Pressure Prof is certainly a valid system for helping you find tire pressures that will work well for your specific needs – The only question that remains is whether you find its exact suggestions perfectly ideal, or if it simply puts you in the ballpark… and that’s something each rider will determine for themselves. The Pressure Prof is very easy to use; simply visit Schwalbe’s website and fill in the required fields with either the requested info or by choosing options from drop-down menus. Learn how your comment data is processed. var smartFormsLastName=""; window.smartFormsItemsToLoad.push({ 'form_id':5, 'elements':[{"ClassName":"rednaotitle","IsRequired":"n","Formulas":{},"Styles":{},"Id":"rnField1","Spacing":"col-sm-12","Title":"Bicycle Tire Pressure Calculator (USA Units)","CustomCSS":""},{"ClassName":"rednaotextinput","IsRequired":"n","Formulas":{},"Styles":{},"Id":"rnField13","Spacing":"col-sm-12","Label":"Your Weight (lbs)","Placeholder":"250","Value":"250","ReadOnly":"n","Width":"","Icon":{"ClassName":""},"CustomCSS":"","Placeholder_Icon":{"ClassName":"","Orientation":""}},{"ClassName":"rednaotextinput","IsRequired":"n","Formulas":{},"Styles":{},"Id":"rnField14","Spacing":"col-sm-12","Label":"Your Bikes Weight Loaded (lbs)","Placeholder":"25","Value":"25","ReadOnly":"n","Width":"","Icon":{"ClassName":""},"CustomCSS":"","Placeholder_Icon":{"ClassName":"","Orientation":""}},{"ClassName":"rednaotextinput","IsRequired":"n","Formulas":{},"Styles":{},"Id":"rnField15","Spacing":"col-sm-12","Label":"Front Tire Width (mm)","Placeholder":"25","Value":"25","ReadOnly":"n","Width":"","Icon":{"ClassName":""},"CustomCSS":"","Placeholder_Icon":{"ClassName":"","Orientation":""}},{"ClassName":"rednaotextinput","IsRequired":"n","Formulas":{},"Styles":{},"Id":"rnField16","Spacing":"col-sm-12","Label":"Rear Tire Width (mm)","Placeholder":"25","Value":"25","ReadOnly":"n","Width":"","Icon":{"ClassName":""},"CustomCSS":"","Placeholder_Icon":{"ClassName":"","Orientation":""}},{"ClassName":"rednaotextinput","IsRequired":"n","Formulas":{},"Styles":{},"Id":"rnField17","Spacing":"col-sm-12","Label":"Precent of Weight on Rear Tire (e.g. • Privacy Policy My wife then read me the weight from each scale and I did the simple math. Personalized Exercise Comparison Calculator (PECC). 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. 160 pounds. Wish I’d thought of that…, I don’t see the calculator accounting for construction, sidewall TPI, etc. window.smartFormsItemsToLoad=new Array(); Would be interesting to see the underlying maths. Schwalbe has decided to make life easier for their MTB customers by creating the Pressure Prof, an online calculator that helps trail or DH riders figure out what pressures they should be running. measured size of tires: 32 mm. Those factors produced Schwalbe’s suggestion of 1.3Bar/19psi up front and 1.5bar/22psi in the rear. Curious to see what it would recommend for me, I punched in the numbers for my Why Cycles PR road bike. The most basic form is the LITE version which limits you to inputs for the total system weight (rider + bike + gear), and the measured tire width.eval(ez_write_tag([[580,400],'bikerumor_com-medrectangle-3','ezslot_1',103,'0','0'])); The more comprehensive Pro version is still free – but you’ll have to cough up your email. That’s lower than I have been riding them, but not by much – I typically pump up to 75/74psi before each ride. Huge Silca fan , had my pump for 38 years! weight of rider & bicycle: 180 lbs. This resulted in a calculator that seems to represents my experience. Tyre pressure is a critical measurement for getting the most out of your mountain bike. This post is trying to help you calculate a good starting pressure for your Road/Tri bicycle tires. Just sayin’. Time to drop some pressure for the next ride! Read on, use the calculator, and then experiment. • Comment Policy But what’s equally important to choosing the right tire for your needs is dialing in the right air pressure for them, especially on off-road terrain. Weight input between 75 – 350 lbs or 34 – 158 kg required. I see two guys of similar build and skill talk about running way different pressures in the real world and I would never tell either of them are wrong. Thanks Beverly, I have no experience or data on DH vs XC casing tires, but have lots of experience with otherwise identical road and gravel tires that have ‘race’ vs ‘endurance’ casings and the like and despite testing for it, have not seen these casing changes change the optimal pressure for a given surface. eval(ez_write_tag([[300,250],'bikerumor_com-box-3','ezslot_2',101,'0','0']));Ever wonder what tire pressure you should be running? So I figured out a way to check at home with no extra stuff. There are a number of variables that go into figuring out the ideal pressure range for a bicycle … I find that the pressure recommendations are actually pretty good. Mexico (also in North America) went metric less than a decade after the USA stole California etc from them. • Ask A Stupid Question It’s since been updated with the correct link. Well tubby here has ridden my road bike in all conditions (except ice, really ’cause why) at 135-145 psi and never lost traction. We offer branding well beyond the standard banner, providing meaningful interaction and powerful connections to drive awareness and sales for your company. From there you need to fiddle with the pressures to see what works best for you. 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. var smartFormsPath="http://engineeredinsanity.com/wp-content/plugins/smart-forms/"; Silca Professional Pressure Calculator - LITE Version . And now I have a headache from all the imperial/metric conversions. • Privacy Policy The Pressure Prof would probably provide anyone with a good starting point so long as you choose a sidewall casing option that’s similar to whatever tires you are running. The numbers schwalbe spits out are pretty accurate for a safe baseline to start with. 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. Pah, 1976 you say? Josh – I see your reasoning I’m just not sure it’s “real world”, an easy example are MTB tire casings, DH vs. XC same size tires will have different pressures. var smartDonationsSandbox=""; 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. By adding your contact info you gain access to more detailed inputs to help you dial in your tire pressure even further. I prefer a higher tyre pressure and a softer more responsive suspension. Maybe you’ve heard that lower pressures are actually faster, while simultaneously being told by someone else that higher pressures are better? This site uses Akismet to reduce spam. Thank you for posting this calculator! LOL at the ridiculously over estimated average speeds people were entering! Supposedly the calculator pulls from 4,000 data points from 150 athletes over the course of 5 years at 90 different events. var smartDonationsRootPath=""; the skinny guy). For example, 90psi in a 25mm tire will feel the same as roughly 70 psi in a 28mm tire. I did not like their weight distribution chart, as it seemed random. If one should Google road bike tire pressure, one gets information that ranged from less than applicable to outright wrong, for the big guy. You human? Bikerumor.com reaches close to one million passionate cyclists per month. This looks like a neat tool. Get Bikerumor’s top stories delivered straight to your inbox every week! 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! I used a couple of online cycling calculators and found that the Gatorskins cost me ~0.4 mph in a perfect world (20/19.6 mph). Our passion is the products, technology and people that make them. 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