Re: 25-30 km/h: 700*23 or 28 Which is better?

On Apr 29, 10:37 pm, Tim McNamara <tim...@xxxxxxxxxxxxx> wrote:
In article
<88e2e4c9-67f6-4481-87b9-c04352a18...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,



landotter <landot...@xxxxxxxxx> wrote:
On Apr 29, 2:21 pm, Tim McNamara <tim...@xxxxxxxxxxxxx> wrote:
In article <481758c1$0$18151$4fafb...@xxxxxxxxxxxxxxxxxxx>,
Mirco Zorzo <mircozo...@xxxxxxxxxxxxxx> wrote:

Hi, looking for long ride with less effort which of this tyre
size is better for minimize the combination of rolling resistance
and aerodynamics?

At those speeds the aerodynamic difference is not likely to be
significant. The rolling resistance research has shown that there
is some indication that the slightly larger tires have lower
rolling resistance, at least up to about 25-26 mm width (usually
marked as 700 x 28). However, many larger tires use a heavier,
less supple casing and a thicker tread and end up with higher
rolling resistance. It is difficult to compare apples to apples in
this case. The 700 x 28 version of the Michelin Pro Race measured
lower in rolling resistance than the 700 x 23 version of the same
tire on one test.

I have been very pleased with the performance of the Panaracer
Pasela in 700 x 25 (25-26 mm actual width) and 26 x 1.25. They are
inexpensive, readily available but are only good for about
1800-2000 miles on the rear IME. If they were slicks I'd like them
even better. Make sure you get the new version and not the older
version with the raised rib around the tire. The puncture
resistance is a bit low with these tires, which is the tradeoff for
good performance and a nice ride.

I mentioned *really* being impressed with the 32s, which I assumed
were going to be 28s, a few days ago, and Paul chimed in and said
he'd gone a couple years with no flats on his in Atlanta. Same casing
as the skinnies--so it's not a hose, just a big poof of a tire. I've
done a couple hundred miles on mine so far, and if a tire passes that
those first couple hundred around these parts, it should hold up. The
28mm Pasela would be my choice for all round light touring,
commuting, distance--just about anything. The 32 at 80psi on the
fixed is a beautiful urbanite, though. Agree about the tread--but as
it rolls as silently as a slick, I assume the decorative tread does
no harm.

The 26 x 1.25 are the same width as the 700 x 32, I think. Very cushy
ride but they seem to roll fine. I've ridden them on brevets and have
been very happy with them. The tread does throw up more water than
slicks, so that is at least one down side.

True, but not a dealbreaker. My fix called me on a beer run last eve
when the roads were wet, when I should have ridden the real bike that
has fenders and and an ATM. They spray more than a slick, but not much
compared to deeply treaded tires. My route was one that needed a bit
of tread.
.

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