General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

The Pressure is on.

Old 10-12-18, 07:59 AM
  #26  
GlennR
Formerly oldnslow2
 
GlennR's Avatar
 
Join Date: Nov 2011
Location: Long Island, New York, USA
Posts: 5,340

Bikes: Trek Emonda SLR, Sram eTap, Zipp 303

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1057 Post(s)
Liked 66 Times in 32 Posts
Originally Posted by rumrunn6 View Post
after confirming the gauge on my pump matches my patented pencil style gauge, I no longer use the hand held gauge at home. but I do carry it on the road but rarely use it even when fixing a flat
you carry a pump on rides?

I just save the space and carry CO2. It provides enough pressure to allow me to finish a ride.
GlennR is offline  
Old 10-12-18, 08:01 AM
  #27  
CycleryNorth81
Senior Member
Thread Starter
 
Join Date: Jun 2014
Posts: 450

Bikes: custom Cyclery North (Chicago), Schwinn Circuit

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 138 Post(s)
Liked 8 Times in 5 Posts
Originally Posted by Litespud View Post
As others have said, consistency is more important than accuracy. I pump my tires to 100 psi, according to the gauge on my old Silca floor pump. It is truly 100 psi? Don't know, but it works for me - not teeth-rattlingly hard, but have never had a pinch flat. If I ever replace the pump, I'll titrate the pressure again to achieve this optimal (for me) pressure. It might not be 100 psi according to the new gauge, but the actual numerical value won't matter.
If you had an accurate gauge you would know what the pressure really is and be able to duplicate/replicate the pressure easily. Accuracy enhances the consistency.
CycleryNorth81 is offline  
Old 10-12-18, 08:03 AM
  #28  
Phil_gretz
Journeyman Bike Commuter
 
Phil_gretz's Avatar
 
Join Date: Aug 2009
Location: Alexandria, VA
Posts: 4,957

Bikes: '71 Jeunet 630, '79 Peugeot PXN10LE, '88 Fuji Saratoga, '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '16 Motobecane Gran Premio Elite, '18 Velobuild VB-R-022

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 533 Post(s)
Liked 40 Times in 27 Posts
Originally Posted by Nachoman View Post
What led you to the conclusion that the Joe Blow 3 was accurate and the others were not?
That's the right question. It's a long story, but I had suspected that the wide variation among the gauges made them useless in an absolute sense. Then we took a few of the pumps up to MD, where my former college roommate has medical instrument calibration equipment in his home office/storage. We compared the measurements to his standard high-end pressure gauges. The Joe Blow was dead nuts on. Probably, this is random among the population of JB3's, but mine (for now) is the most trusted. But I run tires at lower end of pressure ranges, anyhow. I ride "light" for the most part.
Phil_gretz is offline  
Old 10-12-18, 08:03 AM
  #29  
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,703

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
Quoted: 2966 Post(s)
Liked 52 Times in 45 Posts
Originally Posted by oldnslow2 View Post
you carry a pump on rides? I just save the space and carry CO2. It provides enough pressure to allow me to finish a ride.
I was referring to carrying the gauge not a pump BUT I do carry a pump (& CO2). haven't used the road pump in a cpl years cuz I just use the CO2 for the last few needs. I suppose at some pint I'll stop carrying it. (fwiw - the pump I have at home is electric)
rumrunn6 is offline  
Old 10-12-18, 08:06 AM
  #30  
GlennR
Formerly oldnslow2
 
GlennR's Avatar
 
Join Date: Nov 2011
Location: Long Island, New York, USA
Posts: 5,340

Bikes: Trek Emonda SLR, Sram eTap, Zipp 303

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1057 Post(s)
Liked 66 Times in 32 Posts
Originally Posted by rumrunn6 View Post
I was referring to carrying the gauge not a pump BUT I do carry a pump (& CO2). haven't used the road pump in a cpl years cuz I just use the CO2 for the last few needs. I suppose at some pint I'll stop carrying it. (fwiw - the pump I have at home is electric)
There's not much you can do after using CO2 to increase the pressure. you can only let some out. i find a 16g CO2 give me about 85PSI which is a bit low but gets the job done.
GlennR is offline  
Old 10-12-18, 08:27 AM
  #31  
wphamilton
Senior Member
 
wphamilton's Avatar
 
Join Date: Apr 2011
Location: Alpharetta, GA
Posts: 14,474

Bikes: Nashbar Road

Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 2473 Post(s)
Liked 39 Times in 26 Posts
My electric pump has a pressure gauge. It could be marked in Chinese for all I care because I just fill until the needle is pointed in an approximate direction, depending on the bike.
wphamilton is offline  
Old 10-12-18, 11:21 AM
  #32  
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,703

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
Quoted: 2966 Post(s)
Liked 52 Times in 45 Posts
Originally Posted by oldnslow2 View Post
There's not much you can do after using CO2 to increase the pressure. you can only let some out. i find a 16g CO2 give me about 85PSI which is a bit low but gets the job done.
I don't carry a pump to add air after using a cartridge. sorry for any misunderstanding. I carry 20 gram cartridges cuz I've been riding 700x45mm tires & now 29x2.25" tires. it's not uncommon for me to air down for a soft section then air back up when getting onto firmer dirt. & last bike's rear wheel/tire/tube had a tendency to pinch & leak, so I would sometimes after airing down, then have to continually add CO2 until the end of the ride. that situation should be gone now that I'm on bigger tires. admittedly, I waste some of the cartridge cuz I don't use it all, then leaving it on the inflator it either leaks out or when I get home & take it off the inflator, the CO2 escapes :/
rumrunn6 is offline  
Old 10-12-18, 11:27 AM
  #33  
GlennR
Formerly oldnslow2
 
GlennR's Avatar
 
Join Date: Nov 2011
Location: Long Island, New York, USA
Posts: 5,340

Bikes: Trek Emonda SLR, Sram eTap, Zipp 303

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1057 Post(s)
Liked 66 Times in 32 Posts
Originally Posted by rumrunn6 View Post
I don't carry a pump to add air after using a cartridge. sorry for any misunderstanding. I carry 20 gram cartridges cuz I've been riding 700x45mm tires & now 29x2.25" tires. it's not uncommon for me to air down for a soft section then air back up when getting onto firmer dirt. & last bike's rear wheel/tire/tube had a tendency to pinch & leak, so I would sometimes after airing down, then have to continually add CO2 until the end of the ride. that situation should be gone now that I'm on bigger tires. admittedly, I waste some of the cartridge cuz I don't use it all, then leaving it on the inflator it either leaks out or when I get home & take it off the inflator, the CO2 escapes :/
Ah... I was thinking road bike and not off road. You certainly want to air down for better grip on the a loose surface. And then air up when getting back on tarmac.
GlennR is offline  
Old 10-12-18, 11:50 AM
  #34  
CliffordK
Senior Member
 
CliffordK's Avatar
 
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 22,271
Mentioned: 160 Post(s)
Tagged: 0 Thread(s)
Quoted: 8403 Post(s)
Liked 36 Times in 32 Posts
Originally Posted by noimagination View Post
Yep, my right forefinger and thumb. I can use my left in a pinch (ha ha).

This ain't rocket science, folks.
Same here.

I let my pressures vary a bit. I start with maybe 100 or 110 lbs... and then over a month or so the pressure slowly goes down to where I feel it needs tightening a bit (probably below 80, perhaps even in the 60 range), then I pump it up again.

Pumping with both the thumb, and gauge on the pump.
CliffordK is online now  
Old 10-12-18, 12:30 PM
  #35  
bogydave
Senior Member
 
bogydave's Avatar
 
Join Date: Dec 2015
Location: ALASKA , SoCal
Posts: 901

Bikes: /Skye/ Torker mt, Sirrus flat bar

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 185 Post(s)
Likes: 0
Liked 11 Times in 5 Posts
Originally Posted by Retro Grouch View Post
"Seems accurate".
yea
No dead weight tester, no way to calibrate it.

compared to my other gages ,
it’s closer, guessing +/- 10%.

“Assuming” car computer close:
Wife had LR tire pressure warning, said was 27 psi, my other gages read tire near 35 - 40,
this one read it at 27.

To my “squeeze test” +/- 5%

bogydave is offline  
Old 10-12-18, 01:26 PM
  #36  
pvillemasher
Senior Member
 
pvillemasher's Avatar
 
Join Date: Sep 2013
Location: Austin Texas USA
Posts: 317

Bikes: 1989 Trek 400, 2000 Lemond Buenos Aires, 2013 GT Attack, 2017 Lynskey R250

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 116 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by CycleryNorth81 View Post
If you had an accurate gauge you would know what the pressure really is and be able to duplicate/replicate the pressure easily. Accuracy enhances the consistency.
Accuracy means the meter returning the correct value.
Precision would be the meter returning the same value each time, whether accurate or not.
So as was said earlier in the thread, if my tires feel right at 90psi on my meter, and I use that meter to measure, then I just pump to 90psi. It could really be 100psi.
pvillemasher is offline  
Old 10-12-18, 01:30 PM
  #37  
bogydave
Senior Member
 
bogydave's Avatar
 
Join Date: Dec 2015
Location: ALASKA , SoCal
Posts: 901

Bikes: /Skye/ Torker mt, Sirrus flat bar

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 185 Post(s)
Likes: 0
Liked 11 Times in 5 Posts
Originally Posted by pvillemasher View Post
So as was said earlier in the thread, if my tires feel right at 90psi on my meter, and I use that meter to measure, then I just pump to 90psi. It could really be 100psi.
+1
bogydave is offline  
Old 10-12-18, 01:40 PM
  #38  
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,703

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
Quoted: 2966 Post(s)
Liked 52 Times in 45 Posts
Originally Posted by oldnslow2 View Post
Ah... I was thinking road bike and not off road. You certainly want to air down for better grip on the a loose surface. And then air up when getting back on tarmac.
I have to admit, I carry too much stuff, or rather more than I need, so even on my road bike, I just put the same trunk (w pump & CO2) on that bike but swap appropriate tubes ...
rumrunn6 is offline  
Old 10-12-18, 01:50 PM
  #39  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 21,283

Bikes: Some silver ones, a red one, an orange one and a few titanium ones

Mentioned: 91 Post(s)
Tagged: 1 Thread(s)
Quoted: 2415 Post(s)
Likes: 0
Liked 79 Times in 55 Posts
Originally Posted by CycleryNorth81 View Post
If accuracy is not important and the gauges are in-accurate, why have gauges at all? Just pump the tire until firm.

p.s. How did you determine "None" of the gauges were accurate? You must have some reference gauge to compare the readings to.

@Nachoman beat me to the question
All measuring devices have inaccuracies. Tire gauges are no different. Generally speaking, the more you pave for a measuring device, the lower the variance. If you are paying $1 for a tire gauge, don't expect it to be accurate out to 1 pascal (0.000145 psi). If you pay $40, still don't expect it to be accurate to 1 pascal. The $40 gauge will probably be accurate to the nearest 1 pound per square inch (which is still pretty accurate). The $1 gauge is going to be accurate to the nearest 5 psi. And don't be fooled into thinking that because the gauge is "digital" that it is more accurate. It may give you tenths of a psi but that should be taken as being "accurate". That "tenths of a psi" are questionable.

Bicycle tire pressure isn't all that critical so we can live with something that isn't hyper-accurate. People go on and on about how they can tell the difference between 35 psi and 36 psi. They can't. Their gauge may tell them that there is a difference but they probably can't tell the difference in a blind test.

This gauge, by the way, is a pretty good one. It doesn't weigh much, is easy to use, accurate enough and it doesn't require a battery to run it. It's as accurate as the $40 battery powered one.
__________________
Stuart Black
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
An Good Ol' Fashion Appalachian Butt Whoopin'.
cyccommute is offline  
Old 10-12-18, 01:59 PM
  #40  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,572

Bikes: 8

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 6744 Post(s)
Likes: 0
Liked 158 Times in 134 Posts
Largely No, but I own a Meiser tire gauge.. for when I must.
fietsbob is offline  
Old 10-12-18, 02:01 PM
  #41  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 21,283

Bikes: Some silver ones, a red one, an orange one and a few titanium ones

Mentioned: 91 Post(s)
Tagged: 1 Thread(s)
Quoted: 2415 Post(s)
Likes: 0
Liked 79 Times in 55 Posts
Originally Posted by oldnslow2 View Post
you carry a pump on rides?

I just save the space and carry CO2. It provides enough pressure to allow me to finish a ride.
A CO2 cartridge will only let you finish a ride if you need it once. A pump will actually let you finish the ride if you need it many more time. These folks, for example,

DSCN0045 by Stuart Black, on Flickr

were using my pump to get them about 1/4 mile at a time after the 20th flat for the person in front and the 6th flat (with tubeless) for the persons behind. They had just finished pumping up the tire at the top of the hill and had to refill when they got to me. I'd run out of patches at that point...and I usually carry about 20 at a time.
__________________
Stuart Black
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
An Good Ol' Fashion Appalachian Butt Whoopin'.
cyccommute is offline  
Old 10-12-18, 02:02 PM
  #42  
bogydave
Senior Member
 
bogydave's Avatar
 
Join Date: Dec 2015
Location: ALASKA , SoCal
Posts: 901

Bikes: /Skye/ Torker mt, Sirrus flat bar

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 185 Post(s)
Likes: 0
Liked 11 Times in 5 Posts
If accuracy very important to you...
Use this NIST gage as a standard to test/ adjust yours

NIST Traceable Pressure Gauges from Davis Instruments

send in annually to get it certified
bogydave is offline  
Old 10-12-18, 02:43 PM
  #43  
Ogsarg
Senior Member
 
Join Date: Feb 2017
Location: Hollister, CA (not the surf town)
Posts: 614

Bikes: 2009 Specialized Roubaix, early 90's Giant Iguana

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 246 Post(s)
Liked 32 Times in 22 Posts
I carry one of these in my road bike saddlebag since my mini pump has no gauge. It's small and light and fairly accurate. At home, I have a floor pump with gauge.

Eyezoff gauge
Ogsarg is offline  
Old 10-12-18, 02:48 PM
  #44  
Sy Reene
Advocatus Diaboli
 
Sy Reene's Avatar
 
Join Date: Feb 2015
Location: Wherever I am
Posts: 4,662

Bikes: Merlin Cyrene, Nashbar steel CX

Mentioned: 9 Post(s)
Tagged: 1 Thread(s)
Quoted: 2175 Post(s)
Likes: 0
Liked 23 Times in 23 Posts
Originally Posted by cyccommute View Post
were using my pump to get them about 1/4 mile at a time after the 20th flat for the person in front and the 6th flat (with tubeless) for the persons behind. They had just finished pumping up the tire at the top of the hill and had to refill when they got to me. I'd run out of patches at that point...and I usually carry about 20 at a time.
Sounds like a real hoot. Quicker and less hassle to hike the route it sounds like..
Sy Reene is offline  
Old 10-12-18, 02:56 PM
  #45  
rgconner
Senior Member
 
rgconner's Avatar
 
Join Date: Mar 2017
Location: Sacramento, CA
Posts: 1,154

Bikes: Curtis Inglis Road, 80's Sekai touring fixie

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 471 Post(s)
Liked 2 Times in 2 Posts
Originally Posted by cyccommute View Post

were using my pump to get them about 1/4 mile at a time after the 20th flat for the person in front and the 6th flat (with tubeless) for the persons behind. They had just finished pumping up the tire at the top of the hill and had to refill when they got to me. I'd run out of patches at that point...and I usually carry about 20 at a time.
"Nobody told me it was 'Gunsday'!"

"Bro, every day is 'Gunsday'."
rgconner is offline  
Old 10-13-18, 08:12 AM
  #46  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 21,283

Bikes: Some silver ones, a red one, an orange one and a few titanium ones

Mentioned: 91 Post(s)
Tagged: 1 Thread(s)
Quoted: 2415 Post(s)
Likes: 0
Liked 79 Times in 55 Posts
Originally Posted by Sy Reene View Post
Sounds like a real hoot. Quicker and less hassle to hike the route it sounds like..
If it were only a mile or so but we were 8 miles from the trial head. We had to stop frequently but between stops we moved much faster than walking.
__________________
Stuart Black
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
An Good Ol' Fashion Appalachian Butt Whoopin'.
cyccommute is offline  
Old 10-15-18, 12:16 PM
  #47  
eepok
Senior Member
 
Join Date: Nov 2008
Location: Davis, California
Posts: 124

Bikes: 2012 Jamis Aurora

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Liked 0 Times in 0 Posts
Originally Posted by CycleryNorth81 View Post
Do you use an external pressure gauge for your tires? If you do, what do you use and what brand?
Just the gauge on my pumps. Almost every floor pump has one and I carry a Topeak Road Morph G wherever I go.
eepok is offline  
Old 10-15-18, 01:03 PM
  #48  
Ungaro
Member
 
Join Date: Mar 2018
Location: Fayetteville, GA
Posts: 37

Bikes: '71 Raleigh Professional MK III; '88 Bianchi Campione d'Ialia (project); 2011 Ellsworth Roots; 2012 Cool Fixie; 2017 Bottecchia Leggendaria; 2008 Electra Townie

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Here's what I use. Accurate to within 3%: Silca Pista
Ungaro is offline  
Old 10-15-18, 04:31 PM
  #49  
Rootman
Senior Member
 
Join Date: Sep 2012
Location: NW Arkansas, USA
Posts: 1,034

Bikes: 2015 Giant Roam 2 Hybrid

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 91 Post(s)
Likes: 0
Liked 3 Times in 2 Posts
I use what's on the pump or my compressor. As stated it does not make a whole lot of difference. Since bike tires are thin and small the pressure will change with temps and time more than a cars will.

Most gauges I've tried have been fairly accurate. I carry a fairly large foot pump in my rack bag because I have larger tires, and a bad track record with flats. Once I was on my only spare tube of a ride and had to stop 6 times to air up. The patch wouldn't seal on the first tube, a failure around the valve stem. My wife is not very good at navigating so I carry a bunch of stuff, tools, pump, tube, etc. to help make sure I can return home. A hand pump just takes too long so I got the smallest foot pump I could find. And as long as the gauge is fairly accurate it's close enough for me.
Rootman is offline  
Old 10-15-18, 05:36 PM
  #50  
CycleryNorth81
Senior Member
Thread Starter
 
Join Date: Jun 2014
Posts: 450

Bikes: custom Cyclery North (Chicago), Schwinn Circuit

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 138 Post(s)
Liked 8 Times in 5 Posts
Originally Posted by Ungaro View Post
Here's what I use. Accurate to within 3%: Silca Pista
That pump is gorgeous!!

CycleryNorth81 is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.