I'm 220 lbs, and I use 45-50 psi front and 55-60 psi rear in my 38 mm supple tires (Lierre, Pari Moto, et al). I start with the "15% tire drop" method, as developed by Frank Berto and further by Jan Heine <http://www.bikequarterly.com/images/TireDrop.pdf>. Unfortunately, Berto's charts only went up to 37 mm tires, so you have to extrapolate/experiment with wider tires. Calculator here <http://www.dorkypantsr.us/bike-tire-pressure-calculator.html>. I'll add 5-10 psi if I'm fully loaded. I'll drop 5-10 psi if I'm riding more gravel/trail/off-road.
I've found that 38 mm tires feel squirrely to me around 30-35 psi. I ran 85 front / 100 rear on my Cerf blue 700 x 26 tires. I run 60 front / 75 rear on my 700 x 32 Gravel King tires. I run 30 front / 35 rear on my 26 x 2.1" Thunder Burts. I run 7 front / 8 rear on my 26 x 4.6" fat bike tires. On Tue, Jul 26, 2016 at 1:10 PM, Ron Mc <bulldog...@gmail.com> wrote: > 210 lbs, running Barlows on my upright at 60psi rear, 40 psi front. > On my semi-upright, running Stampede at 65psi rear, 55 psi front. > > Mostly concentrate on not shocking the rims and handling. I have some big > hills to go down. I've also noticed another squishiness that can develop > at high speed, when centrifugal forces are stretching tje tire out and they > don't have sufficient pressure for good lateral stiffness, but I only see > that if I let the pressures drift a little below the numbers above. > > -- > 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 https://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > -- 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 https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
