You can add to your list of possible and theoretical problems when using too wide a tire on too narrow a rim, that there is at some (not known to me) point the theoretical danger that the overfat tire may overpower the rim wall and break it. But at 20 psi, I don't think -- "think" -- that this is a problem.
IIRC, Jan discussed this in BQ somewhere back when.Can others add to the answer? Interesting aside: I used the 50 mm (labeled) F Freds on 44 mm Sno Cat rims; ok, not bad; they measured perhaps 52 and had a flattish profile. I swapped the same tires to 35 mm Velocity Blunt SS's, and the tires (now 51 actual) had a much nicer, rounded profile that (at least in imagination) cornered more nicely. Make of this what you will. Me, I make that 50 mm tires play 'specially nice with 35 mm rims. On Sun, Oct 30, 2016 at 8:02 PM, Steve Palincsar <palin...@his.com> wrote: > Not quite the answer I was in search of. I forget what the issue is, > exactly, but there's something to do with sidewalls that's a concern if not > outright hazard when you're so far beyond the design recommendation. But, > your answer has inspired me to consult the Great Oracle Google, and here's > what I found: > > http://www.bikerumor.com/2016/08/12/tech-story-match- > bicycle-tire-width-rim-width-best-results/ > > > *"If the tire is too wide for a given rim, you get more tire roll due to > the larger casing size and higher aspect ratio of the tire, which together > create more leverage on the tire allowing the casing to collapse and roll > over the rim during hard cornering." * > > I imagine this is exacerbated by low tire pressures. It turns out that > the thing I was vaguely remembering as a problem is actually an artifact of > the exact opposite: "*The basics are that if you run a rim that is too > wide for a particular tire you have a lot more issues with tire and rim > damage, as the rim is much more likely to bottom out on lateral rock > impacts causing tire or rim damage."* > > On 10/30/2016 08:55 PM, Patrick Moore wrote: > > Be serene, acushla. Open Pros are perfectly wide enough for 40 mm tires. > Breathe deeply in relief and gratitude. > > I rode thousands of miles with 2" tires on much narrower rims -- 19 mm > outside to outside, with nary a fall or slip. I rode 65mm actual Big Apples > on 24 mm outside to outside rims, at sub 15 psi. Absolutely not a problem, > apart from the funny squirmy feel on pavement -- but then, I'd just pump > them to a hard 20/25, and all would be well. > > On Sun, Oct 30, 2016 at 4:27 PM, Steve Palincsar <palin...@his.com> wrote: > >> >> >> On 10/30/2016 01:32 PM, Jeff Lesperance wrote: >> >>> The tires I have on it now are Compass Snoqualmie Pass, which are >>> labeled at 700x44, and though I haven't measured them yet, I suspect >>> they're closer to 40mm as installed on the narrow-ish Open Pro rims I have >>> for now. So the answer is they will fit Snoqualmie Pass and fenders, though >>> there are a few tight spots that I'm not concerned about, but if the tires >>> stretch or I swap to a wider rim, which I intend to do, I may have to >>> reconsider the fender solution. I've split fenders previously to get a bit >>> more clearance under brakes, so I may go that route if need be. >>> >> >> Wow! Mavic recommends the Open Pro for tires 19 to 28mm in width. You're >> really stretching the envelope by going up to 40mm. I guess the question >> to ask now is, "What could possibly go wrong?" (No, seriously) >> >> > -- > 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. > -- Resumes, LinkedIn profiles, bios, and letters that get interviews. By-the-hour resume and LinkedIn coaching. Other professional writing services. http://www.resumespecialties.com/ www.linkedin.com/in/patrickmooreresumespec/ Patrick Moore Alburquerque, Nouvelle Mexique, Vereinigte Staaten ************************************************************************** ************** *The point which is the pivot of the norm is the motionless center of a circumference on the contours of which all conditions, distinctions, and individualities revolve. *Chuang Tzu *Stat crux dum volvitur orbis.* *(The cross stands motionless while the world revolves.) *Carthusian motto *It is *we *who change; *He* remains the same.* Eckhart *Kinei hos eromenon.* (*It moves [all things] as the beloved.) *Aristotle -- 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.
