For those who don't subscribe to
RoadBikeRider News, thought I would forward this interesting article. I am
sure it will spark some lively discussion.
Cheers,
Bill Elliott
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
RoadBikeRider.com
Newsletter Issue No. 233 -
02/23/06: Ride With
Us
ISSN
1536-4143
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2. Uncle Al:
Inflation
Revelation o^o
o^o o^o o^o o^o o^o
Tire pressure is one of the most
controversial and misunderstood elements of road riding.
Most roadies are under the mistaken
impression that unless pressure is well over 100 pounds per square inch (psi)
it's like they'll be dragging around a boat anchor. Tire manufacturers
perpetuate this myth by stamping a Maximum Tire Pressure value on the sidewall.
For road tires, this can range from 110 psi to an astronomical 170 psi.
Combine these pressures with the
super-stiff, radial-spoked wheels many riders are now using, and the result is
some serious self-abuse.
Based on 40 years of wrenching and
my discussions with tire experts and pro riders, there's no compelling reason to
run more than 95 psi for 95% of your riding. Our roads are deteriorating faster
than politicians can spend our tax dollars, and really high pressure means a
really harsh ride.
I could also mention poor cornering,
short tire life, and the promise of many punctures.
The key here is to ride the tire
size that matches your weight. Many roadies are running 700x23C no matter what
they weigh. If you're over 180 lbs. (82 kilos), 25C is a better choice. For us
"Clydesdales" over 205 lbs. (93 kilos), 28C is the smart
size.
I'm talking fast recreational riding
here, not racing or touring. Racers can go narrower and tourers should go
wider.
If your tire size corresponds to
your weight, you can run 90-95 psi and not risk pinch flats. I guarantee you
will roll just as fast or faster than you think you do on higher pressures.
You'll descend and corner faster (and safer). You'll suffer fewer punctures, and
your tires will last as much as five times longer.
So if you're a max-pressure person,
try lowering the psi and upping the size (if your weight says you should). Wean
yourself off high pressure bit by bit if you wish till you’re down to 90 psi
front and 95 rear.
Then experience the suppleness your
tires are supposed to possess. Check out how much smoother cornering is, how
much more comfortable you are, and how much less fatigue you feel at the end of
your rides. I bet you'll
be pleasantly surprised.
(Click feedback@xxxxxxxxxxxxxxxxx to tell
us a mechanical matter you'd like to see Uncle-ized.)
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