Philip, thanks again. I look forward to looking at the new version. My apologies for not citing you correctly in the first send. Bob
On Tue, Jul 9, 2013 at 5:36 PM, Philip Williamson < philip.william...@gmail.com> wrote: > My pleasure. I maintain the spreadsheet, but I didn't create the original > Excel formulas. That was Dave Adams, and he based his formula on Frank > Berto's measurements, as reported by Bicycle Quarterly. > > Fellow list member Allan Folz wrote new formulae for the Android Tire > Pressure app we worked on together (and are working on updating right now, > actually), so they're slightly different at the extremes. Amazon lets you > demo the app for free online, if you're interested in a different approach: > http://www.amazon.com/Edison-Gauss-Publishing-Pressure-Calculator/dp/B008J0YAHM > > Philip > www.biketinker.com > > > On Tuesday, July 9, 2013 12:28:27 PM UTC-7, Deacon Patrick wrote: >> >> Thanks, Bob and Philip! My main gage is to have enough pressure to not >> get snake bit on rocks or roots, but not a whole lot more than that. >> >> With abandon, >> Patrick >> >> On Tuesday, July 9, 2013 12:34:22 PM UTC-6, Robert Barr wrote: >>> >>> Deacon, there is a spreadsheet calculator built that uses the data from >>> Jan's extension and discussion of Frank Berto's earlier work. You can >>> access it at http://www.biketinker.com/**2010/bike-resources/optimal-** >>> tire-pressure-for-bicycles/<http://www.biketinker.com/2010/bike-resources/optimal-tire-pressure-for-bicycles/>. >>> Read the post and then click on "tire pressure calculator" in the black bar >>> at the top of the page. I have been fascinated by how well it works. >>> Everyone that I have talked with has lowered their tire pressures and had a >>> better ride. I am sure I first read about the spreadsheet on this forum, >>> but I couldn't find the original post - my apologies to the original >>> poster. Bob (Indianapolis) >>> >>> >>> On Tue, Jul 9, 2013 at 9:12 AM, Deacon Patrick <lamon...@mac.com> wrote: >>> >>>> Fascinating pressure chart and 15% compression rule. Thanks. >>>> Extrapolating it for 50mm tires and 190lbs (+ whatever weight I have in my >>>> bags), I'm guessing my usual pressure is spot on. I'm actually quite >>>> comfortable with my usual pressure (likely 40-50 psi) for paved, dirt, and >>>> trail riding. I just found it intriguing that I noticed the higher pressure >>>> and did not like it. >>>> >>>> With abandon, >>>> Patrick >>>> >>>> >>>> On Monday, July 8, 2013 8:42:19 PM UTC-6, dougP wrote: >>>>> >>>>> Sounds like the fenders fit about as close to the tire as possible. >>>>> If deflating to your normal pressure made the sound go away, bingo, you >>>>> got >>>>> it! FWIW, once I got up to 40 mm tires on my Atlantis, pressure seems a >>>>> minor item. I pump the back up to 60ish & front to 50ish, then ride until >>>>> they feel mushy (usually several weeks). Larger tires would probably be >>>>> even less sensitive. >>>>> >>>>> The article that Ron mentions is excellent & gives a good starting >>>>> point for arriving at an optimal personal pressure. I find it reassuring >>>>> that smarter people than I have spent some time & energy on the question, >>>>> and the answer is that pressure is not that critical with larger size >>>>> tires. It's worth thinking about & experimenting with to find out what >>>>> works best for you, your bike, & your loads. >>>>> >>>>> dougP >>>>> >>>>> On Monday, July 8, 2013 1:19:41 PM UTC-7, Deacon Patrick wrote: >>>>>> >>>>>> I'm not really sure what tire pressure I ride with, I just know it by >>>>>> feel. On my recent S24O I kept hearing the bizarre sound that I could not >>>>>> place. I hand't heard it on pavement on the climb up, it just started >>>>>> were >>>>>> the dirt started. An odd reverberation. Checked all bolts to ensure they >>>>>> were snug. Fender rubbing? No. All other checks negative. Felt my tire. >>>>>> Yowza! Rock hard. Deflated it to the proper hard squish. Bike rode better >>>>>> and sound eliminated. I'd forgotten to check the pressure after I had my >>>>>> spoke fixed at my LBS. They must just automatically inflate to max. >>>>>> >>>>>> With abandon, >>>>>> Patrick >>>>>> >>>>>> *www.MindYourHeadCoop.org* >>>>>> *www.OurHolyConception.org* >>>>>> >>>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "RBW Owners Bunch" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to rbw-owners-bun...@**googlegroups.com. >>>> To post to this group, send email to rbw-owne...@googlegroups.com. >>>> Visit this group at >>>> http://groups.google.com/**group/rbw-owners-bunch<http://groups.google.com/group/rbw-owners-bunch> >>>> . >>>> For more options, visit >>>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> >>>> . >>>> >>>> >>>> >>> >>> -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rbw-owners-bunch+unsubscr...@googlegroups.com. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > Visit this group at http://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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