That's true except they also indicate a bit further on that in order to prevent "excessive stress on the rim" when the rim is narrow and the tire is wide, they recommend pressures less than max. They do say a wider rim "often" provides additional stability and that a "slightly" reduce pressure can be ridden before stability becomes "spongy". It's interesting that they use words such as "slightly" and "spongy". Before I was concerned that there might be some danger in the narrow rim/wide tire setup, but now I'm thinking that it might be more a question of feel or possibly ride quality. Anyway, I'll try my MA 3's with 40 or 42's and see what happens. Tom
On Dec 13, 10:38 pm, PATRICK MOORE <bertin...@gmail.com> wrote: > Very interesting -- it is a change from other advice I've heard. But you've > got it exactly backward (and Schwalbe says the opposite: read more > carefully) about lower pressure on a narrow rim: you need higher pressures > on a narrower rim, all else equal. > > I know that one big benefit of wide rims (as Schwalbe notes) is that they > give a fat tire more stability so that you can run it at lower pressures: I > run my 60 mm BAs as low as 12/16 on dirt on 45 mm rims with no adverse > consequences (I'm 175). I've even run them this low on pavement: apart from > a bit of bounce, no real problem. Flop in cornering is hugely reduced > compared to the same tire and pressure on a 25 mm rim. > > Note though that a given pressure on a wider rim will feel "harder" than > the same pressure on a narrower rim, doubtless due to that same, better > sidewall support; this is my experience with the BAs and the 45 mm versus > 25 mm rims. > > On Tue, Dec 13, 2011 at 8:44 PM, Thomas Carstens > <tjaycarst...@gmail.com>wrote: > > > > > > > > > > > > > Thanks for the help! Since yesterday I've discovered an interesting > > article on the Schwalbe tires web site. > >http://www.schwalbetires.com/tech_info/tire_dimensions#rim > > According to them, the European Tire and Rim Technical Organization > > Standards have changed due to a lot of experience with MTBs using > > narrow rim/wide tire combos with no negative consequences. They have > > a chart which differs from others I've seen. Also, they seem to > > suggest that, if anything, on a narrow rim wide tire setup the tire > > pressure should possibly be reduced. > > Tom > > > -- > > You received this message because you are subscribed to the Google Groups > > "RBW Owners Bunch" group. > > 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. > > -- > 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 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.
