Tire Pressure Question
I don't have a pump with a working pressure gauge, nor do I have a presta compatible tire gauge.
At 85 psi, with 700x32 tires, how firm should the tires be when I lean on them? I weigh 110, and currently they flex outwards about 1mm, but I'm afraid to put more air in when I can't accurately see what the pressure is. Sorry for the stupid question; I could buy a new pump or a gauge, but my LBS is 20 miles away and this seemed easier. |
I heard that the tire manufacturers list the suggested pressure as half of the pressure it takes to blow the tire off of the rim. So it takes some doing to put too much pressure in a tire.
Rolling resistance decreases with pressure. But rolling resistance tends to not decrease much with increasing pressure above 90 PSI for 23 mm tires. Also you get the negative of getting a harsher ride when you put in a bunch of pressure. Why pay $$$ for that super compliant frame and then negate much of it by riding rock hard tires? The major reason to add pressure to a tire is to prevent pinch flats when you go over a pebble or hit a small ridge or so on. I would think that with your stated 1 mm flex that you are probably safe from getting a pinch flat. |
Originally Posted by Pat
(Post 8668741)
I heard that the tire manufacturers list the suggested pressure as half of the pressure it takes to blow the tire off of the rim.
|
You can buy a good electronic guage in the automotive section of just about any store, for less than $10. Good up to 100#
|
Originally Posted by Wanderer
(Post 8669002)
You can buy a good electronic guage in the automotive section of just about any store, for less than $10. Good up to 100#
|
If you have a schrader pressure gauge, you can get a presta to schrader adapter for around $3. It's worth the trip. Buy a couple they are cheap.
Originally Posted by Retro Grouch
I've heard that statement from a number of sources none of whom had anything to do with manufacturing or marketing bicycle tires. I wonder if it's true.
|
Since you obviously have access to the internet, and since USPS, UPS, and FedEx deliver to your door, 20 miles to the LBS is irrelevant, I'd say.
|
Originally Posted by 2manybikes
(Post 8669022)
If you have a schrader pressure gauge, you can get a presta to schrader adapter for around $3. It's worth the trip. Buy a couple they are cheap.
|
If you weigh 110, it's not going to be super critical.
Air your tires up until they feel right, ride to the bike store, buy a gauge. |
On tyre pressure as recommended. I ride my Michelin PR2's at 140 psi--recommended max is 116psi.
Tandems take a lot of weight so I always go 20% over the max recommended to stop Pinch Flats. Only problem with High pressure is that it will give you a harsh ride- but the bike rolls better. Unless you do have a high pressure floor pump- you will not be able to get above the max on a tyre with a frame pump- unless you have a lot more strength than I have. Low pressures as run on MTB's are the exception. |
My Bontrager 700 X 32C tires say 110 psi Max. I would think 90 would be fine for around-the-town cruising. But I don't use them. They came stock on a Trek 7.5 FX. I swapped 'em for some 700 X 28C tires - with a Max. of 100 psi!
|
Now that you have the answer to your question - go buy a "patented" tire pressure gauge in the range for bikes. DO NOT buy a gauge that is not "PATENTED" it will just be a waste of money.
|
at 110lbs, does one even need to inflate their tires?
|
be nice
|
Originally Posted by Retro Grouch
(Post 8669322)
Will an ordinary Schrader pressure gauge and an adapter work with a presta tube? I'm thinking the little Schrader finger won't go down far enough to push the poppet valve open.
I'm sure you know plenty of people who don't get it, or don't care. At a shop with a presta pump with a gauge, who cares? |
Originally Posted by grimace308
(Post 8674742)
at 110lbs, does one even need to inflate their tires?
|
All times are GMT -6. The time now is 12:01 AM. |
Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.