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
<mailto: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)
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