Re: [RBW] Re: Tire Pressure Surprise
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/. 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 lamontg...@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-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. 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.
Re: [RBW] Re: Tire Pressure Surprise
A little reader tells me that the original poster was Phillip aka Bike Tinker. Thank you Phillip. Bob On Tue, Jul 9, 2013 at 2:34 PM, Robert Barr rcba...@gmail.com 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/. 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 lamontg...@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-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. 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.
Re: [RBW] Re: Tire Pressure Surprise
Thanks, Bob and Phillip! 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/. 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.comjavascript: 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 javascript:. To post to this group, send email to rbw-owne...@googlegroups.comjavascript: . 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. 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.
Re: [RBW] Re: Tire Pressure Surprise
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/. 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. 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. 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.
Re: [RBW] Re: Tire Pressure Surprise
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-bunchhttp://groups.google.com/group/rbw-owners-bunch . For more options, visit https://groups.google.com/**groups/opt_outhttps://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
