Comparativa anchos de neumático ¿Cuál es más rápido? 25 vs 34

In this video, we analyze the belief that a 34mm tire can be as fast as, or even faster than, a 25mm tire in modern cycling. We examine how wider wheels and tires can offer greater comfort and safety. Discover whether your bike's speed is actually affected by rim size. In this video, we compare 25mm, 30mm, and 34mm road tires to answer an increasingly important question: which tire width is truly faster, and how does pressure influence performance? To do this, we tested three Schwalbe Pro One tires in 25mm, 30mm, and 34mm widths, comparing not only the tire width but also the complete wheel + rim + pressure combination, which is where the real difference lies. What we analyze in this test • Actual width of each tire mounted on the rim • Actual circumference for accurately measuring speed on a velodrome • Influence of pressure on watts and efficiency • How the external and internal rim width affects performance • The 105% rule between tire and rim • Differences between riding at 35 km/h and 40 km/h • Which combination works best for my weight and this setup Setup and basis of the test The rims used, Lun Hyper 5 D50 (you can find them here: https://raceit.cc/products/ruedas-car..., have: • 23 mm internal width • 30.5 mm external width And here's one of the key points of the video: it's not all about the tire, but how well it fits the rim it's mounted on. Actual measured widths: • 25 mm at 4 bar = 27.5 mm • 30 mm at 4 bar = 30.5 mm • 30 mm at 3 bar = 30.4 mm • 34 mm at 4 bar = 33.5 mm • 34 mm at 3 bar = 33.4 mm Measured circumferences: • 25 mm at 4 bar = 210 cm • 30 mm at 4 bar = 212.5 cm • 30 mm at 3 bar = 211 cm • 34 mm at 4 bar = 214 cm • 34 mm at 3 bar = 213.5 cm 105% Rule We start with the well-known 105% rule, according to which the external width of the rim should be approximately 105% of the actual tire width. In this case: • 25 mm → approx. 110% ratio • 30 mm → approx. 100% ratio • 34 mm → approx. 91% ratio By proportion, the 30 mm tire is the best fit for these rims. Results and conclusions At 35 km/h The differences were small. In all cases, the power output was around 200 watts, so at that speed, pressure and width don't make much of a difference. At 40 km/h Here the differences are much more pronounced: At 4 bar • The 25 mm tire performed the worst: • 19 W more than the 30 mm tire • 25.2 W more than the 34 mm tire At 3 bar • The 30 mm tire required 23.5 W less than the 34 mm tire 30 mm: 3 bar vs 4 bar • At 3 bar, 25.8 W less power was needed than at 4 bar Final conclusion For my rims and my weight (approximately 69 kg), the best combination is clearly: • 30 mm tire • Pressure closer to 3 bar than 4 bar And this is probably the most important conclusion of the video: It's much more important to maintain the correct tire pressure than to obsess over using a narrower or wider tire. In my case, I've always tended to run slightly overinflated tires because of that feeling of "it rolls better," but the data says otherwise: it's not better to run them harder. We also discuss: • Why tire tread pattern can help aerodynamics • What some professional teams are using • Why not all slicks are necessarily the fastest option • How we measure speed on a velodrome using actual circumference + speedometer • Using the AeroSensor and the new AeroBody to measure my head height relative to the handlebars Chapters: 00:00 Intro 00:34 Test Protocol 01:13 25mm Tires 01:43 105% Rule and Rim-to-Tire Ratio 02:38 Circumferences and Measurement Method 04:49 25mm Tire Test 05:50 30mm Tires 07:53 34mm Tires 07:58 Actual Width Measurement 08:33 34mm Tire Test at 4 bar 09:00 Analysis of 4 bar Test Data 09:25 Test Analysis 35 km/h at 4 bar 11:00 Analysis of the 40 km/h test at 4 bar 12:38 34mm Tire Test at 3 bar 13:21 The Importance of Tread Pattern (Slicks) 14:23 Data Analysis of the 3 bar Tests 14:45 Analysis of the 35 km/h test at 3 bar 15:11 Analysis of the 40 km/h test at 3 bar 16:16 Conclusions 18:38 SRAM Pressure Calculation Tool 20:42 My Feelings 💬 What tire size do you use on the road: 25, 28, 30, or 34 mm? And what pressure do you usually ride at? 🔔 Subscribe for more bike testing, aerodynamics, cycling technology, and real-world comparisons with data. #roadcycling #cycling #roadbike #bicycle #roadbike #carlosaizpun #tires #schwalbe