Re: fast tires

On 6/12/2025 4:42 PM, Roger Merriman wrote:

Zen Cycle <funkmaster@hotmail.com> wrote:

On 6/12/2025 3:23 PM, Mark J cleary wrote:

On 6/12/2025 1:32 PM, Zen Cycle wrote:

On 6/12/2025 12:38 PM, Mark J cleary wrote:

On 6/12/2025 7:19 AM, Roger Merriman wrote:

cyclintom <cyclintom@yahoo.com> wrote:

People seem to think that fast tires have low rolling resistance
but that
is hardly the case In the rolling resistance tests 25 mm tires have
lower
rolling resistance than 28's. And high pressure 23 mm lower still,
Remember that they claim that their setup has bumps etc to correct
rolling resistace for road conditions but that can't be the case.
>

Whose tests? Drum tests particularly one with smaller drums will give a
less realistic model of tarmac.
>

Vittoria Corsa is rated as lowest rolling resistance but in my
experience
Michelin Pro5's are faster. Also I  find that setting pressure
below the
Silca pressure calculator increases the speed if not taken to
extremes.
>

Both are designed to be fast road tyres, so you’d expect fairly close
performance between brands. And road is much more homogeneous than
gravel
or MTB
>

I find TPU innertubes to be unbelievably expensive and flat very
easily.
I see no advantage to them. While Latex tubes do increase speed, they
have to be pumped up every ride. In cold weather I can ride a butyl
tube
for a week before pumping them up again.
>

In my relatively short experience of TPU tubes, is that they offer same
amount of puncture resistance aka zero if it gets through the tyre,
it’s
game over.
>
They do feel noticeably nicer vs Butyl tubes, are yes more expensive
and
more tedious to fix, though that would depend on how many punctures
someone
gets I used to get 1 every year or less. So it’s a £10 over a year at
worst.
>

Tubeless is nasty to work with. The tires are more expensive and
harder to mount.

>
Absolutely can be, the ongoing maintenance is why I run it on one
bike and
not all of them. While I’m a fan it’s not the best option 100% of
the time.

>
The informaion we are being fed is lacking accuracy and incomplete
leaving you to have to experiment yourself.
>

As with life need to fact check and be sure one understands let
alone that
for example tyre choices for example for my gravel bike each ride I do
would favour different tyre choices.
>
I’m fairly sure that for my uses bigger tyres into XC MTB sizes would
perform better for me most of the time.
>
Roger Merriman
>

>
I ride faster on my 25mm road bike Conti GP5000
s on the rim brake Habanero. I ride slower on the 32MM Conti's I have
on the disc brake Habby. I have no stats or ways to measure except
how fast I ride on any given ride. Lately the fatter 32 mms seem to
me to be a bit heavy and roll with more balancing require by me. I
have no idea why.
>

>
It may have something to do with the road surface. One reason 32s can
be faster than 25s is if the road surface is on the rough side. If
you've been riding on new pavement lately, the 32's don't offer much
advantage.
>
>
Of course inflation pressures have a lot to do with it. You might want
to experiment with the pressures, and don't forget to consider that
your gauge may be off too. The pump I keep in my car pump somehow
become offset by 20 PSI with no warning. I should just toss it because
I have three more floor pumps that are all good, I just have a real
hard time throwing away usable cycling parts and equipment (Much to my
wife's chagrin).
>
It sounds as if you're running the 32s somewhat underinflated. Put
another 10 PSI in and see what you think.
>

>
According to the charts I should run about 62 in rear and 58 in front. I
do run about this amount a bit more at the start. These I don't need to
pump ever day before a ride they loose PSI slower of course.

>
On smoother roads you may feel better performance running a bit higher
pressure.

 Indeed pressure guides are that just a guide plus how a tyre feels some
folks don’t like any flex in the tyre and so on.

>

>
Zen how are you doing after the car hit seems like riding inside.
>

>
As well as can be expected. PT and Orthopedist said indoor trainer is
fine, but stop if I feel any pain. Cracked ribs have healed, the
shoulder sprain is slow going (In the words of the ortho "Everything is
where it should be and somehow nothing is broken, you just crushed it).
I passed the concussion protocol three days after the hit (failed it a
few hours after the hit). I have to rehab the MCL to a certain level
before they'll schedule surgery for the ACL - Then it's another 6-9
months of rehab. They're thinking early august time frame for the
surgery....maybe. IOW I won't be riding outside until next march at the
earliest :( .
>
>
>

All things considered that’s a good outcome, even if it’s a frustrating
one!

Yup, the speed limit on that road is 50 MPH. If I had been bounced into the oncoming lane they would have been scraping me up with a spatula.

 Roger Merriman

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