It looks like the numbers are congruent with the Agile tool and the "BikeTinker" chart at 25mm + 200lbs, but diverge at 37mm + 300lbs. I have it on good authority that the responses are not linear: http://www.biketinker.com/2010/bike-resources/optimal-tire-pressure-for-bicycles/
Philip On Mar 12, 2:18 pm, Philip Williamson <[email protected]> wrote: > This one here allows you to input your own widths into a Google > Doc.http://www.biketinker.com/tire-pressure-calculator/ > > Agile is smart to make theirs a web form (says the guy who cleans up > broken formulas). > > Philip > > Philip Williamsonwww.biketinker.com > > On Mar 12, 10:16 am, PATRICK MOORE <[email protected]> wrote: > > > > > > > > > Thanks, Tom -- and thanks everyone for the comments. Too bad this > > calculator only goes up to 37 mm tires; also, seems high: 116 or so > > for a 175 lb rider on 23s compared to the 90/10 or 65/70 for 35s that > > I personally like, tho' I don't aim for a 15% drop. > > > Hope to get out on this sunny, forecast-mid-60s day for some dirt 'n' > > pavement on the 60s. > > > On Sun, Mar 11, 2012 at 9:29 AM, tdusky <[email protected]> wrote: > > > Use this tire pressure calculator for good results: > > >http://www.dorkypantsr.us/bike-tire-pressure-calculator.html > > > > Tom Dusky > > > Huntington Woods, MI > > > > On Saturday, March 10, 2012 5:48:43 PM UTC-5, Patrick Moore wrote: > > > >> I just pushed the Fargo 19 rolling-hilly miles around Rio Rancho, NM > > >> with the SnoCat/Big Apple wheelset at about 30/35 -- much higher and > > >> the bumps start feeling as if I'm riding 23s at 120 (that is a slight > > >> exaggeration, but seriously, I've found that the fatter the tire, the > > >> harsher the ride if you overinflate); this after having let the > > >> heavyweight wheelset sit for weeks while I rode the Rhyno Lites with > > >> the new 330 gram, 35 mm Kojaks. I must say that the combination of 800 > > >> gram rims with 800 gram tires (both rim and tire are the "Lite" > > >> versions) and 200 gram tubes makes a, ahem, difference -- a 3 1/2 lb > > >> difference between the two wheelsets, I estimate. This wheelset is > > >> wonderful on sandy terrain and it rolls very well on the flats, both > > >> on pavement and on choppy but firmish dirt, but as soon as you > > >> encounter an incline, man do you feel that weight! I emphasize: the > > >> Big Apples roll very, very will for such a wide carcass with a > > >> protective belt -- I push along on the flats on firm surfaces in a > > >> 46/20 for a 67" cruising gear, compared to 70 to 75 for a road bike > > >> with nice tires. But again, tilt upward, and wham, gravity intervenes. > > >> (Btw, Newton posited "gravity" as a placeholder for his theory; a mere > > >> name to signify that one body moved toward another in proportion to > > >> their respective masses; but he said quite explicitly that he had no > > >> idea what cause, if anything, was behind this word and, further, he > > >> says explicitly in the Principia that "action at a distance" -- ie, > > >> physical action without actual contact of bodies -- was, quite > > >> literally, unthinkable.) Whatever "gravity" may or may not be, those > > >> BA and SnoCats sure feel like cold molasses on uphills. > > > >> Long windup. Those of you who ride 60 mm Big Apples or similar tires: > > >> how do you find them on hills? What pressures do you use on pavement, > > >> and what is your weight? -- of course, that decides how firm the tire > > >> has to be. Would I be better off with lighter and narrower rims (wish > > >> I hadn't sold those Salsa P35s!) at the expense of less sidewall > > >> support? > > > >> The new 42 Noodles felt noticeably more "natural" than the 46s they > > >> replaced. More generally, the Fargo is set up very nicely: it feels > > >> very "natural" even though the bar is some 4 to 5 cm higher than on > > >> the benchmark Rivs. On pavement I spend most of my time in the hooks, > > >> for with the bars this high, even the hoods seem rather "tippy" unless > > >> I bend my elbows, a natural inclination. > > > >> The BB7s are powerful but lack the nice, smooth and easily modulated > > >> control that good cantis have -- by good cantis I mean either old > > >> Shimano wide profiles or those IRCs that Riv sells. And you have to > > >> keep bending the g-d disks back into plane, at least if, as I do, you > > >> very frequently carry the wheels off-bike in the back of your car. I'd > > >> prefer a bit more weight and thickness for disks that didn't bend out > > >> of plane so easily. OTOH, with riding in sandy soil and swapping > > >> between 44 and 27 mm wide rims, the disk system makes up for its > > >> defects, at least for my taste. > > > >> -- > > >> Patrick Moore > > >> Albuquerque, NM > > >> For professional resumes, contact > > >> Patrick Moore, ACRW > > >>http://resumespecialties.com/index.html > > > > -- > > > You received this message because you are subscribed to the Google Groups > > > "RBW Owners Bunch" group. > > > To view this discussion on the web visit > > >https://groups.google.com/d/msg/rbw-owners-bunch/-/vJyIJ4oM8UYJ. > > > > To post to this group, send email to [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]. > > > For more options, visit this group at > > >http://groups.google.com/group/rbw-owners-bunch?hl=en. > > > -- > > Patrick Moore > > Albuquerque, NM > > For professional resumes, contact > > Patrick Moore, ACRWhttp://resumespecialties.com/index.html -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
