Topping of the air

"Ken Bessler" <[email hidden]> wrote in message "]news:[email hidden]...

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I saw this sentance in another thread:

onefred said:

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This is a Continental GP3000 tire, size 20x700c on a Mavic CXP33 rim.

About

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2 years old and 200o miles and never flatted. I inflate to 120# before

EVERY

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ride. I weigh 185#.

I too have to top off my tubes to 110# every couple of days. When I used to ride a mountain bike
(40#) I never had to top off the tubes...

Is this normal for road bikes? Sorry if it's a dumb question.... newbie here but learning lots
from you folks....

Yes, road tires have less volume, and higher pressure, so they tend to lose pressure faster. I
usually pump mine once a week or so (25-28 mm, 110 psi).

Ken Bessler said:

I too have to top off my tubes to 110# every couple of days. When I used to ride a mountain bike
(40#) I never had to top off the tubes...

Is this normal for road bikes?

It is common.

As well as the narrow size and high pressure, the tube walls may be thinner so more porous than than
your old mountain bike ones. The air escapes through the butyl rubber. You could try and find some
thicker and wider* tubes if you don't want to inflate so often but they will be heavier and possibly
less supple, although more reliable. Personally, I'm happy to use ultralight narrow tubes. Topping
up is no big deal when you have a floor pump at home and aren't touring.

* Wider tubes don't stretch so much so also will be less porous. Tyres can take a range of
tube sizes.

~PB

Quoted message said:

I too have to top off my tubes to 110# every couple of days. When I used to ride a mountain bike
(40#) I never had to top off the tubes...

Is this normal for road bikes? Sorry if it's a dumb question.... newbie

here

Quoted message said:

but learning lots from you folks....

I recommend topping off your road bike tires before *every* ride, even if it's daily. Road tires
perform best within a very narrow range of pressure (unlike a mountain bike, where it's much less
critical), and, sorry, the best calibrated thumb in the world is no match for a pressure gauge, and
won't tell you if your tire has 100psi or 120.

In addition, topping them off before each ride will help you spot slow leaks more readily... leaks
that might indicate something that's a small problem now, but potentially bigger soon.

If you want to do it right, inspect your tires *after* each ride, and inflate just prior. Why
inspect after the ride? Because you won't be in a rush so, if you find something that looks bad, you
can take care of it instead of rationalizing that it'll be OK or be late for the ride.

--Mike-- Chain Reaction Bicycles chainreactionbicycles.comchainreactionbicycles.comOpen ↗

MikeJ-<< the best calibrated thumb in the world is no match for a pressure gauge, and won't tell you
if your tire has 100psi or 120. >><BR><BR>

C'mon Mike, those same thumbs can find spoke tension and crank arm torque....don't need
measuring tools!!!

;-l)...

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"

Quoted message said:

C'mon Mike, those same thumbs can find spoke tension and crank arm torque....don't need measuring
tools!!!

Yeah, but I probably lost their calibration from mounting too many motorcycle tires back in the day!

--Mike-- Chain Reaction Bicycles chainreactionbicycles.comchainreactionbicycles.comOpen ↗

"Qui si parla Campagnolo" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

MikeJ-<< the best calibrated thumb in the world is no match for a pressure gauge, and won't tell
you if your tire has 100psi or 120. >><BR><BR>

C'mon Mike, those same thumbs can find spoke tension and crank arm torque....don't need measuring
tools!!!

;-l)...

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"

Ken Bessler' may have said:

I too have to top off my tubes to 110# every couple of days. When I used to ride a mountain bike
(40#) I never had to top off the tubes...

Is this normal for road bikes? Sorry if it's a dumb question.... newbie here but learning lots from
you folks....

Yes.

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