David Auker
How do they fit the rim? Easy on/off? How about
a catastrophic flat...big puncture/blow-out...are they characteristic
of clinchers, unpredictable about staying on the rim? If so, the
sew-up is probably safer in Grand Tour type racing. Just a thought.
David
hrdtduck wrote:
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What you say is
true the weigh difference is minor at best…but
two large differences….cost of the tire itself, and ease of use,
make for a pretty strong argument for tubeless….to fix a flat out on
the
road all I have to carry is a tube, & a dollar (for those big
holes)….what
can you do when a sew-up flats on the road?...do you carry a spare tire
when
you ride?..... not to mention the issue of trying to put a replacement
tire on
over a previously glued rim…when it all boils down to it….sew-ups
probably
ride better overall, but I think the new technology will replace the
old in
time….I have been told/& read that some teams are already using
tubeless on this year’s Tour…..It is only a matter of time…Have
you tried them?? I was so amazed I bought 2 wheel sets (perhaps
excessive, but
I am kinda like that about bicycling)…..
Howard
From:
obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On
Behalf Of Harry
Phinney
Sent: Wednesday, July 09, 2008 1:01 AM
To: obra@list.obra.org
Subject: Re: [OBRA Chat] Tubeless clinchers - fad or
On
ride comfort, are the tubeless really more comfortable than
e.g. 25 mm Vittoria Evo Open CX tires or 25 mm Michelin Carbons at 90
PSI? On
weight, the tubeless tires save little. Excel lists the Hutchinson
tubeless
tires at 290 g. To that you need to add the weight of the valve. An old
bolt-on
presta from a tube I have weighs 7 g, so call the tubeless a total of
297 g.
The 25 mm Vittoria weighs 242 g, and a latex tube I had lying around
weighs 60
g for a total of 302 g. The tubeless saves 5 grams in this example,
with no
sealant. Perhaps I should add the weight of a rim strip for the tube
case. A
Rox strip such as I use in my racing wheels weighs around 3 g, making
the
tubeless weight advantage 8 g. I honestly can’t remember the last time
that I pinch flatted a 25 mm tire, but I do ride them at 100-110 PSI,
not 90
PSI. While I am obviously skeptical of the performance claims for them,
I’m really not opposed to the idea of tubeless tires. I much prefer
them
on my motorcycles; they’re harder to repair for flats, but easier to
change and I replace worn tires more than I repair flats on the motos.
Harry
Phinney
From:
obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On
Behalf Of hrdtduck
Sent: Tuesday, July 08, 2008 1:56 PM
To: 'Erik'; 'Doug Sears'; obra@list.obra.org
Subject: Re: [OBRA Chat] Tubeless clinchers - fad or
I have to agree
over the thought that when you spend a lot of
money on something you tend to ignore what may not meet your
expectations….However if there were nothing else to evaluate…..the
ride comfort alone sells me on the tubeless clincher tire….From what I
understand about the specific Shimano/Hutchinson technology, lower air
pressure
is designed in and not necessarily the root/only cause for smoother
ride
experience…even at the lower air pressure rolling resistance is claimed
to be lower (I do not have any way to test that so I have to depend on
what
Shimano & Hutchinson have to say, after all, why would they lie??
Hey Look
I know what you are going to say…)…All I really know is what my
butt, hands and average ride speeds tell me…they all have
improved…..Bonus?? No more pinch flats!!.....if I do get a flat I can
put
a tube in as easily as a regular clincher, and be on my way. I save a
small
about of weight (no tube), while the tires aren’t cheap they cost no
more
than any high end clincher and less that tubular…..and I get a great
ride, they also seem to conform to the road better when in a high speed
corner…..Like disc brakes on Mountain bikes…I don’t think I
will be going back to the older technology……
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