Rene I am 257 and have have wondered also about the charts but I've had good success running 38mm Schwalbe Supreme tires at 65 psi on the road and 41mm Marathons at around 55 psi. Much less and they are sluggish on pavement. I don't drop pressure for gravel or dirt but have probably ridden with ten pounds less when I don't check my tires before riding and that is when they feel sluggish. I usually look at the sidewall recommendation and buy a tire that has enough width for my weight without exceeding 90 psi. So 32mm is about the narrowest I can go. I've seen and used the charts and generally agree with them and I'll bet the flyweights among us can and do run super low pressures. Back in my youth (165 lbs) I remember running 23mm tires at 80 psi. I don't think I can put enough air in a 23mm tire now without it feeling like a rock and risking a blow out.
On Saturday, January 19, 2013 1:23:18 PM UTC-8, René wrote: > > Since I'm a heavy guy, the spreadsheet that has been posted for all to > determine the optimal tire pressure has been very usefull for me, > particularly as all my bikes have different tire widths/sizes. However, > last week I ran into a couple of issues with this chart that I'd like to > see how everyone else has addressed: > > 1) Does tire size (650b, 700c, etc.) affect the optimal pressure for a > give tire width? > 2) If you are a very light person, for wider tires you get some ridiculous > low number, like 7lbs. How do you determine the lowest pressure to use in > these cases? > 3) Can I extrapolate these values to tubeless MTB tires as well? > > Any extra feedback is welcome! > > René > -- 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/-/yczbWE6a2F0J. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
