On 2018-04-20 10:25, 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.


I carry a tube. That is generally used for other riders. Since adopting
thorn-resistant thick tubes plus liners I no longer have flats. However,
a pinch flat would ruin $15+ worth of tube every time and I don't want
that to happen. It is also a royal pain when on a tight schedule. "Sorry
for being late, folks, but I hit a pot hole and got a flat. So lets get
started with the meeting". Why risk a pinch flat when it can easily be
avoided?

After all, we also don't run our car tires underinflated. Or at least
shouldn't.

--
Regards, Joerg

http://www.analogconsultants.com/