> FWIW, 1.25 559 Paselas measure 31 mm on narrow 19 mm Sun semi aero
> mtb rims.
Mine are 32 mm on my Sun CR-17 and CR-18 mismatched rims. And IMHO
the best road tire I have found for 26" rims (I think I tried them
after Patrick recommended them on the iBOB list a few years ago).
>> On Dec 3, 10:20 pm, Hank Wirtz <h...@wirtznet.net> wrote:
>>
>>> Wire-bead Paselas are famous for blowing off the rim. Avoid them.
>>> Get
>>> the folders. The folders are fantastic tires. The wire-bead ones are
>>> not.
> On Dec 3, 10:42 pm, Jim Thill - Hiawatha Cyclery <thill....@gmail.com>
> wrote:
>> "Wire-bead Paselas are famous for blowing off the rim. Avoid them."
>>
>> We have sold and installed hundreds of wire-bead Paselas in the
>> past 3
>> years. This reputation for blowing off rims has not been validated by
>> our customers or in my personal riding experience with them. I find
>> them generally true to nominal dimensions, within a mm or so.
> Three of the four wire-bead ones I've bought (two in 700x28, one in
> 26x1.75) have blown off their rims. with the 700s, it happened on two
> different rims, a Torelli Master and an Ambrosio Evolution. The 26"
> one was on a Campy Thorr. No other model of tire, wire or folding, has
> done that to me before or since, and that counts 4 years of
> professional wrenching in the late '80s.
>
> A 75% blow-off rate on that many tires, plus the numerous reports of
> others in the Surly LHT group and RBT tells me that it's not bad luck
> and it's not in my head.
>
> I'm glad your luck has been better, but I'm not riding a wire-bead
> Pasela ever again. Like I say, love the folders.
Like Jim I have had zero blow-offs with the wire-bead Paselas and,
contrary to the current trend, I run tires at the maximum rated
inflation at all times. Wire-bead Paselas are all I use now and have
been for a couple of years. I am still using MA-2 rims on my 700C
bikes, with the exception of a Velocity rim on one wheel, and Sun
CR-16 and CR-18 rims on my 26" wheels.
I wonder about your rims. Torelli rims were well-known for
inadequate quality control with batches of them being undersized or
oversized. Torelli's rims were made by Ambrosio, so it's possible
that the quality control problems are present in both brands. I
don't know about the Campy rims (my guess is that they are also made
by Ambrosio rather than Campy buying the tooling to make their own,
but that's just a guess with no facts to back it up).
I do also recall there being an Asian tire maker that created some
problems a couple of years ago when they made a batch of tires with
the bead either longer or shorter by a couple of mm, but my
recollection is vague and I can't remember if it was Panaracer nor
whether it was folding bead or steel bead tires that were involved.
Maybe there's someone here with a better memory than mine.
I've used both wire- and kevlar-beaded Paselas for the last 5-6 years
and never had one blow off the rim. I wonder if there was just a bad
batch of them or something. It wouldn't take much, a little out of
tolerance can make a big difference in fit, especially if the rim is
also a hair small.
I have a set of Nashbar-branded 26" slicks that are so tight (on
Ritchey rims that have had a dozen or more different tires on them w/
no problem) that they took a good part of the afternoon to get
mounted, and days before the beads came out reasonably even. I changed
them for knobbies last year, and i'll never mount those tires on my
wheels again. I've considered donating them, but i'd hate to just pass
on the misery to someone else.
--
Bill Connell
St. Paul, MN
--
Jim Edgar
Cyclo...@earthlink.net
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William Gibson - "Virtual Light"
As a data point, I mention that I have been using wire bead "700c x
32mm" (actual 27mm) Paselas on my Torelli Master rims for thousands of
miles, and everything works perfectly. The Paselas are a little less
difficult to mount on these largish rims than my previous tires,
Avocet Fasgrips. I don't know what is causing Hank's problem - I would
be inclined to support the QC theory - maybe your tires are from a bad
batch?
James Black
Los Angeles, CA
All tires, not just wire bead Paselas, are famous for blowing off rims
when they are installed with a big of tube caught under the bead. And
that's just about the ONLY way you're going to see a tire blow off the
rim, at least in my experience.
Two more likely bets, IMO, would be either poor mounting technique or
the use of tubes that are a bit too large. The result in either case
would be a bit of tube caught under the bead, which eventually will
lever the tire off the rim.
>
> I should mention that the 700 x 28 wire bead that blew off the rim was
> on an Alex rim, if memory serves. I have 700 x 28 wire beads tires on
> Campy rims with no problems (so far anyway). When the tire blew off
> the rim it was a few minutes after mounting the tire in the living
> room, and not while riding. Also, I don not believe that it was
> sloppy mounting technique that caused the tire to unseat.
>
I've found that there are some tubes that, although labeled correctly,
are just large enough that it becomes extremely difficult to stuff the
tube in and not get part of it caught under the bead. Ordinary "not
sloppy practice" just doesn't suffice. My solution to this has been
to move down to the next smaller size tube.
I notably had the problem with Specialized 559 x 1.5-1.75 tubes used
in 650B Col de la Vie tires. The "official" Schwalbe 650B tube says
it also fits 559 x 1.5-1.75, and other brands of 559 x 1.75 tubes fit
just fine, no mounting issues, in the CdlVs. But the Specialized
branded tubes are much larger than the Schwalbes or other brands of
tubes I've used. The next size down, marked 559 x 1.25 - 1.5 are a
perfect fit: puff them up with a few pumps so they hold their shape,
stuff them into the tire, and you couldn't catch them under the bead
if you were trying to.