On Sun, 22 Apr 2018 06:53:29 -0700, Joerg
wrote:

On 2018-04-20 17:46, John B. wrote:
On Fri, 20 Apr 2018 10:25:59 -0700 (PDT), jbeattie
wrote:

On Thursday, April 19, 2018 at 10:45:47 AM UTC-7, Joerg wrote:
On 2018-04-18 18:16, Andre Jute wrote:
On Wednesday, April 18, 2018 at 6:02:49 PM UTC+1, Joerg wrote:
Just received some 25mm Vee Rubber road tires and it says
7bar 100psi max on the side. That's a bit low for my taste.

The Zafiro I have on there now says 100psi min and 130psi max
which is more up my alley.

By how much can a low max rating be exceeded? I like
100-115psi on my road bike in back. On the front I won't
exceed the max because a blow-out would be nasty and that
carries less weight anyhow.

-- Regards, Joerg

http://www.analogconsultants.com/

Is this some new California fad, riding offroad on narrow
rubber? Whatever for? BTW, I have no problem with low- or
zero-tread tyres because I ride mainly on tarmac, even in the
narrowest lanes, but surely a mudplugger wants considerable
mechanical grip.


No fad but road bikes out here must cope with road sections that
are either gravel or dirt. Part of life.


There's a good reason not to blow up tyres over the max
recommendation: It can get pretty nasty and expensive when
overinflated tyres blow the rim apart. It is well worth reading
Andy Blance, the designer of Sheldon's beloved Thorn bike, on
tyre inflation: see page 36 at
http://www.sjscycles.com/thornpdf/th...a_brochure.pdf


It's a 30+ MB file and their server seems to be on an old dial-up
line.


I was a convert to comfortable suspension and inflation
regimes already in my motor-racing days, and achieved the same
results the same way in cycling: see
http://thorncyclesforum.co.uk/index....16360#msg16360


(which is an extended version of a reply I first made on RBT to a
query by Pete Cresswell) and read on in the ensuing very
well-informed engineering discussion about ways of determining
the optimum tyre inflation.

In fact, there are all kinds of really good reasons for
inflating bicycle tyres to the lowest you can get away with
short of snake bites.


Right, and then you get a pinch flat or snake bite which is
often unfixable in the field. All it takes is one pothole. No
thanks.


Do you not carry a tube? You can squeeze one in next to the
heart-lung machine, rope, winch and iron rail segment used for
pounding in chain-pins with found fence nails. There should be
room in your pannier somewhere.

-- Jay Beattie.

But unless your nickname is Mighty Lung Larry, you also need to
carry a tire pump and then the pressure becomes a problem so you need
to carry a pressure gauge....


Unless you are in the hills weght doesn't matter much. Also, my Topeak
Pocket Rocket pump is small and doesn't weigh much. It is a lot better
than CO2 cartridges that many cyclists then carelessly leave laying
around on the ground.

Pressure gauge? A seasoned cyclist should be able to gauge the tire
pressure with a thunb.

That sounds like an old experienced cyclist, but can you tell the
difference between 65 psi and, say 70 psi?



Just one problem after another..... Take the car?


For comparable health benefits it would need to be muscle-powered.

http://thenewswheel.com/wp-content/t...=90&w=660&zc=1

If you look into the matter you find that bicycling is certainly
better then sitting on the couch watching Oprah but that is about it.
Even marching at the standard rate (116 beats a minute with a 30 inch
pace) is a better exercise, both as a weight bearing activity and for
the heart-lung machine and if you get really frisky and try any of the
elite army unit "tads" then you are talking about 12 miles in 3 hours
carrying 32 Kg. in the U.S. Army, while the Romans, in ancient times,
did 35 km. in 5 hours carrying 20 kg.
--
Cheers,

John B.