Can be a good tire if you don't care about puncture resistance. So the higher the pressure, the fewer molecules of air you put into the tire per stroke, and the magnitude of this effect depends on the pumpâs stroke volume and dead space volume. Tire volume was calculated using a perfect torus, and I used an online ideal gas law calculator for the hard math parts. (I've only ridden the extra light versions). Don’t ride in big pacelines and stay out in the road as much as is safe. Had not seen this, when I wrote my reply above at a later time, but my calculations were not totally crazy then. If you’re looking to make your local mountain bike trails a bit more challenging, fit a pair of R2R Rating 10 tires on your bike and shred on. Thanks to Seattle’s Compass Bicycles, fans of wide tires don’t have to sacrifice width for performance. Everything else came from my pretty deep parts bin. Best flat protection? This leads me to believe the rough approximation is not all wrong. Thank you for doing something so nice and positive for the rest of us humankind. This bike with these tires is a true all road go anywhere bike. * Puncture Factor = Puncture Resistance * Total Tire Thickness. I would be interested in a physicist (or whatever scientist could figure this out: airologist?) Is there a rule of thumb which of your tires work best for whom? While it might take more pump strokes to fill up a larger tire I find that the effort is much less than filling up a racing tire to a high psi.
Good luck. Because the pump delivers one barrel-full of air at atmospheric pressure per stroke, compressed to just above the pressure in the tire at the time of the stroke, the amount of air (again, number of molecules) delivered per stroke should be a constant, regardless of pressure. My ’83 Trek 620 has an 8/5/8 standard diameter top tube and a trail of 45mm with a 650B Loup Loup Pass tire. When we compare the Bon Jon Pass to other thin tires in the road bike category it can't compete against the fastest rolling tires. https://janheine.wordpress.com/2014/01/01/tires-how-wide-is-too-wide/ James – Wit… Should I allocate most of my budget to the frame? Compass must know what it's like. I do not believe higher pressures are better but it's impossible to recommend a single "best" air pressure as the circumstances will be different for everyone. Although I've placed the 35 mm wide Bon Jon Pass in the touring bike category, it has become obvious to me that this is more of a big road bike tire than a true touring bike tire after taking these measurements. So unless the frame was designed for wider-than-usual tires (e.g., a cyclocross bike, or some older frames), 38 mm will not fit. I am going to follow your advice most of the way, however. Over the past couple of years, I've received an … “The puffy tires rolled at my usual speed on pavement and handled the unpaved surfaces with plenty of traction in loose corners and surprising comfort even on washboard.” 3
Thank you for your excellent blog. Most road bikes today have clearance for 25 mm tires, some up to 32 mm, but rather few beyond that. I have a great road racing bike but I find myself riding bikes equipped with the Compass 38’s for just about everything these days. Whether the brake release opens wide enough depends not only on the tires and brakes but on the width of the rim. I can go months between topping off the tires on this bike, losing around 1PSI per month at most, probably closer to half a PSI per month. I was interested in the move to wider tires and thought that going from 25s up to 32s would be a good test of their reported benefits: a smoother ride, greater resistance to pinch flats and no loss in speed compared to “racier” tires. Most new frames are at 130 (âroadâ) or 135 (âmountainâ or âtouringâ) mm. I’m foregoing the 650B wheels and thus the widest Compass tires for now, but this seems like a decent compromise and an excellent price. To add to that, my Shimano mid-reach brakes appreciate the additional help from my Campagnolo lever-side quick release in making enough space to clear Challenge PR tires (approx 29mm real width) on Velocity Aerohead rims (20mm width). The tubed Compass tires ride wonderfully. 4. Grand Bois 650B rim (new model) Certainly a demand for a range of tires used in between pure road and all-dirt. While the Bon Jon Pass is basically a big (thin) road bike tire, the Schwalbe Marathon Almotion (read review) is a true touring bike tire with a total tread thickness of 6.6 mm (Bon Jon Pass = 2.9 mm).
For example, tire diameters of 559 mm (MTB), 571 mm (triathlon) and 590 mm (Dutch touring bikes) are all labelled 26″. Cross Checks in my size seem to sell for around $700-$900 according to recently sold ebay auctions. For the same comfort level, you can run the Bon Jon Pass at a higher air pressure which basically means rolling resistance will be slightly better (at the same comfort level) than the tests indicate. On my Nordavinden with 622x32mm Compass tires, inflated to around 3x the pressure of my Trucker, it loses pressure much more rapidly. Compass also sells this tire with an extra light casing that saves 50 grams of weight but has an even higher price tag. And you donât need to ride on gravel or rough roads to appreciate the comfort and performance of wide, supple tires. Compass offers tires … Hey Robert, I have a Surly Cross Check that I bought used for $300. Lezyne Swivel Drive HP pump (no longer made â similar to the Micro Floor Drive HP but about 3cm shorter, and easily fits in handlebar bag) Check our The Test
Compass 32mm & 38mm Tire Review Folks who are interested in fast, supple tires may want to read my Compass tire review . Long reach brakes: $55 https://janheine.wordpress.com/2012/11/06/ride-the-bike-you-have/. Tread Depth. Â© 2020 Rene Herse Cycles | Privacy and Terms. Most of Compass tires come in … / 5
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