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tire pressure(11 posts)

tire pressureWarren128
Jun 27, 2001 3:13 PM
All this talk of CO2 vs. pumps brought up another question for me. Are you carrying a pressure gauge with you on the road, or do pumps/cartridges have built-in gauges? Otherwise, I'm not sure how folks can tell whether their tires are 70psi or 100psi, other than "feel" (that's how I've been doing it).

Thanks,

Warren
Yes, I carry a gaugeCima Coppi
Jun 27, 2001 3:23 PM
After I bought my CO2 pump, I've been carrying a gauge. I found the CO2 cartidge will fill my tire to >120 psi, so I let air out until I get back down to 100 psi. The gauge is very light, and takes up very little space in my saddle bag.
FREE InventionMeDotOrg
Jun 27, 2001 3:43 PM
...to the person who invents it. A pressure gauge that connects to a gas station air hose on one side, and a presta valve on the other. When the pressure reaches a predetermined level (say 120 psi) all the air is diverted to a bleed-off valve.

I think this would effectivly replace CO2 for a lot of people. You'd still carry a frame pump. Inflate your tire to 100 psi and ride to a gas station to top off. You don't have to worry about running out of CO2 cartridges, it's more environmentally friendly, and you have a justification for carrying an air pressure gauge.
by "feel". NMHaiku d'état
Jun 27, 2001 3:42 PM
The Topeak Road Morph wg frame pump has a gaugeLeroy L
Jun 27, 2001 3:51 PM
built in which reads about 5lb. low in my case. The pump has a hose connecting to the valve and morphs into a mini floor pump. No worries re: breaking the valve stem. Plenty of pressure. Carry it under the top tube w/ velcro bracket. Easy to use.
For those who don't have gauges,sidley
Jun 27, 2001 3:59 PM
What does 100 psi feel like between the thumb and index fingers? Rock solid or does it have a little give? Can I attribute my snail like pace to underinflated tires? Don't answer that last question.

Thanks
For those who don't have gauges,LC
Jun 27, 2001 4:25 PM
See if you can barrow a pump with a gauge on it and pump it to 80 psi and give it a squeeze, then pump it to max (110-120 depending on your tire) and squeeze it again. Most bike shops have a pump, or many people bring one in their car on a group ride.
gauge seems useless to memr_spin
Jun 27, 2001 4:03 PM
I can tell by checking the pressure when I get home. I don't see any value in carrying a gauge with me. I know I can't pump up a tire much past 70psi, so being able to confirm that isn't going to help get more air in!

As for CO2, I usually buy the 12 grain cartridges that claim to fill to 110psi. My GP3000s want 120 psi, so I just empty the whole thing into the tire. I've used the 16 grain ones, too, which I think claim 125psi. I empty those, too. Never had any problems.
Gauge at home, minipump on roadRich Clark
Jun 27, 2001 5:10 PM
My floor pump has a gauge, of course. If I can get anywhere near 100psi with my minipump it's a miracle, so a gauge would be useless; I pump after a repair so that I can get to someplace with a real pump. I do carry a shraeder/presta adapter, though.

RichC
Gauge at home, CO2 on road (nm)Elefantino
Jun 27, 2001 7:58 PM
re: tire pressuremackgoo
Jun 29, 2001 12:24 AM
I have a Silca floor pump at home. Every other day I pump my tires up to max pressure. I carry the co2 on the bike, I've never had to use it. I suppose if I did get a flat I would inflate the tire to where it looked good, then ride home. I think by keeping the tires at full pressure goes a long way towards not getting the flat in the first place.