Psimet's tip of the Day
#26
Senior Member
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 40,865
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 2952 Post(s)
Liked 3,106 Times
in
1,417 Posts
Oh, great. Now I need to bring a calculator and the bathroom scale into the garage each morning.
#27
I eat carbide.
Thread Starter
Join Date: Jan 2006
Location: Elgin, IL
Posts: 21,627
Bikes: Lots. Van Dessel and Squid Dealer
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1325 Post(s)
Liked 1,306 Times
in
560 Posts
When did you upgrade your rig??
__________________
PSIMET Wheels, PSIMET Racing, PSIMET Neutral Race Support, and 11 Jackson Coffee
Podcast - YouTube Channel
Video about PSIMET Wheels
Podcast - YouTube Channel
Video about PSIMET Wheels
#28
Infamous Member
Join Date: Sep 2005
Location: Ohio
Posts: 24,360
Bikes: Surly Big Dummy, Fuji World, 80ish Bianchi
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 4 Times
in
3 Posts
I'm just glad you didn't post this before RAIN last year, or I would have surely had a pinch flat!
__________________
"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey
"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey
#29
I eat carbide.
Thread Starter
Join Date: Jan 2006
Location: Elgin, IL
Posts: 21,627
Bikes: Lots. Van Dessel and Squid Dealer
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1325 Post(s)
Liked 1,306 Times
in
560 Posts
The formulas don't take into account those at the far ends of the spectrum
They provide a good baseline for those that don't know where they should be. Too many rider pump their tires to what is on the sidewall as the max without any other reason other than ....that's what's on the sidewall as a max....
They provide a good baseline for those that don't know where they should be. Too many rider pump their tires to what is on the sidewall as the max without any other reason other than ....that's what's on the sidewall as a max....
__________________
PSIMET Wheels, PSIMET Racing, PSIMET Neutral Race Support, and 11 Jackson Coffee
Podcast - YouTube Channel
Video about PSIMET Wheels
Podcast - YouTube Channel
Video about PSIMET Wheels
#30
superArti
Join Date: Apr 2008
Location: Minnersoter
Posts: 1,056
Bikes: 2007 Fuji Professional 2.0, 2009 GTw Avalanche 2.0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
The formulas don't take into account those at the far ends of the spectrum
They provide a good baseline for those that don't know where they should be. Too many rider pump their tires to what is on the sidewall as the max without any other reason other than ....that's what's on the sidewall as a max....
They provide a good baseline for those that don't know where they should be. Too many rider pump their tires to what is on the sidewall as the max without any other reason other than ....that's what's on the sidewall as a max....
#31
Senior Member
Seems to work. I get something around 115psi for my 23mm tires which is feasible, though on the high side. I actually run them closer to 103 front/108 rear. I weigh in at 185lbs.
I get relatively few flats, though I might be working on the good will banked up with the flat gods after my 4 puncture flats in two days run last fall with the one-in-a-million-run-over-a-razorblade-and-cut-the-tire-in-half day the week before.
I get relatively few flats, though I might be working on the good will banked up with the flat gods after my 4 puncture flats in two days run last fall with the one-in-a-million-run-over-a-razorblade-and-cut-the-tire-in-half day the week before.
__________________
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
#32
Tête de Limace
I've definitely been running at about MAX - 5 p.s.i. for both tires the last couple of years. I had figured I didn't want to put it all the way to max, but had no info on how much under it should be.
So for me, 175lbs, 23c tires...
Tire Width=23: Pressure(psi) = 0.33 * Rider Weight in lbs + 53.33
111.08 rear, 99.972 front. I guess I'll need a more accurate guage
Actually, I guess I haven't been that bad on the rear tire. Only about +4 psi there, but I'm closer to +15psi on the front. I will give it a try, but if I get a flat I'm coming for your head.
So for me, 175lbs, 23c tires...
Tire Width=23: Pressure(psi) = 0.33 * Rider Weight in lbs + 53.33
111.08 rear, 99.972 front. I guess I'll need a more accurate guage
Actually, I guess I haven't been that bad on the rear tire. Only about +4 psi there, but I'm closer to +15psi on the front. I will give it a try, but if I get a flat I'm coming for your head.
#33
Senior Member
Join Date: Jun 2007
Posts: 635
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Is this total bicycle load, or just rider weight? That could be 15-20 lbs (pounds) difference. Is this love, baby, or is this confusion.
#34
grilled cheesus
my head hurts. cant someone just pump my tires up for me. this is just crazy. later.
__________________
#35
I eat carbide.
Thread Starter
Join Date: Jan 2006
Location: Elgin, IL
Posts: 21,627
Bikes: Lots. Van Dessel and Squid Dealer
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1325 Post(s)
Liked 1,306 Times
in
560 Posts
Is this total bicycle load, or just rider weight? That could be 15-20 lbs (pounds) difference. Is this love, baby, or is this confusion.
Like I said - it gives you a great starting point.
For me formula yields 103FX114R. I run at 7.2bar front and 8 rear on 23mm tires. (104FX116R). Rides great and no flats.
EDIT: Can't wait until my next tip.
__________________
PSIMET Wheels, PSIMET Racing, PSIMET Neutral Race Support, and 11 Jackson Coffee
Podcast - YouTube Channel
Video about PSIMET Wheels
Podcast - YouTube Channel
Video about PSIMET Wheels
#36
Senior Member
Join Date: Aug 2007
Location: Rock Island, IL
Posts: 594
Bikes: LeMond Chambery
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Wow, according to your formulas I have been inflating my tires to the proper inflation +/- a couple pounds.
#37
Genetics have failed me
I just pump until my arms are to weak to fill more air into my tires. Is that OK or am I underinflating my tires and ego too much?
__________________
Gelato aficionado.
Gelato aficionado.
#39
the dog ate my earbuds
Join Date: Mar 2005
Location: Jersey Shore
Posts: 2,118
Bikes: Colnago CT-1 B-stay Campy Carbon Record, '05 Litespeed Siena Campy, Bridgestone X03 , Peugeot dream bike gets FIXED, Waterford Campy Record Colbalto, Motobecane Tandem in perfect condition, A Belgium made Bertin that was sent by an angel
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
This is really making me rethink my body weight.
How much does 14 inches of thick hair weigh?!!
should I keep my nails short too? I could weigh GRAMS less!
How much does 14 inches of thick hair weigh?!!
should I keep my nails short too? I could weigh GRAMS less!
__________________
Litespeed Siena, Campy
Peugeot U010, Deep V's in orange and fixed
Bridgestone X03 - the beer bike
Waterford R2200, Campy Chorus/Super Record Cobaltobrakes
Motobecane Tandem - Craigslist find
Belgium Bertin. an angel spared it and sent it my way.
Fuji Folding 4130 Mountain bike - Marlboro edition trash find
Specialized HR -A1, latest trash find (who throws bikes out??!!)
Litespeed Siena, Campy
Peugeot U010, Deep V's in orange and fixed
Bridgestone X03 - the beer bike
Waterford R2200, Campy Chorus/Super Record Cobaltobrakes
Motobecane Tandem - Craigslist find
Belgium Bertin. an angel spared it and sent it my way.
Fuji Folding 4130 Mountain bike - Marlboro edition trash find
Specialized HR -A1, latest trash find (who throws bikes out??!!)
#40
Infamous Member
Join Date: Sep 2005
Location: Ohio
Posts: 24,360
Bikes: Surly Big Dummy, Fuji World, 80ish Bianchi
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 4 Times
in
3 Posts
If you use the formula and the recommended inflation exceeds the max rating of your tire, welcome to the far end of the spectrum. We serve pizza at noon.
__________________
"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey
"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey
#41
Senior Member
Join Date: Jul 2006
Location: chicago,Il
Posts: 2,401
Bikes: yes please
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
2. look down--is it hard to find your body? Yes: see a doctor...wait, stop at Hardies/taco bell/DDs, McDs, eat, then see a doctor, NO: you are within the 68%
#42
Senior Member
Join Date: Sep 2005
Location: Elgin, IL
Posts: 923
Bikes: Cannondale H500, Pinarello Surprise
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
I'm past the far end of the spectrum. I fill my tires to max psi and I still hear them groan when they see me approch in my shorts.
__________________
and the road becomes my bride
I have stripped of all but pride
So in her I do confide
And she keeps me satisfied
Gives me all I need
and the road becomes my bride
I have stripped of all but pride
So in her I do confide
And she keeps me satisfied
Gives me all I need
#43
Senior Member
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 40,865
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 2952 Post(s)
Liked 3,106 Times
in
1,417 Posts
Can't wait for tomorrow's Tip o' the Day. It'll probably involve a slide rule and an astrolabe.
#45
175mm crank of love
Join Date: Apr 2007
Posts: 3,387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
109 rear
98 front
was 120 and 120
I could tell the difference right away. The front end felt softer and had more grip in the corners. I felt more comfortable leaning farther over and I had more confidence with higher entrance speeds. I did not sence an increase in rolling resistance. I was able to "spin-out" in top gear in several places.
98 front
was 120 and 120
I could tell the difference right away. The front end felt softer and had more grip in the corners. I felt more comfortable leaning farther over and I had more confidence with higher entrance speeds. I did not sence an increase in rolling resistance. I was able to "spin-out" in top gear in several places.
Last edited by RichinPeoria; 04-24-08 at 05:21 AM.
#46
I eat carbide.
Thread Starter
Join Date: Jan 2006
Location: Elgin, IL
Posts: 21,627
Bikes: Lots. Van Dessel and Squid Dealer
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1325 Post(s)
Liked 1,306 Times
in
560 Posts
I have pretty extensive morning meetings this morning. Post the tip near lunchtime.
__________________
PSIMET Wheels, PSIMET Racing, PSIMET Neutral Race Support, and 11 Jackson Coffee
Podcast - YouTube Channel
Video about PSIMET Wheels
Podcast - YouTube Channel
Video about PSIMET Wheels
#48
Senior Member
Join Date: Oct 2004
Location: Absecon, NJ
Posts: 2,947
Bikes: Puch Luzern, Puch Mistral SLE, Bianchi Pista, Motobecane Grand Touring, Austro-Daimler Ultima, Legnano, Raleigh MountainTour, Cannondale SM600
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
After you seat the tire on the rim, push the valve stem inwards into the tire. Otherwise the section of tube surrounding the valve stem may get trapped under the tire bead.
#49
Road Runner
Mine came out to 100.08 rear, so now I have to find a tire guage that reads to hundredths of a psi.
#50
Up on the Down Side
Join Date: Mar 2005
Location: Chicago(ish)
Posts: 6,334
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 5 Times
in
4 Posts
I used Psimet's formula to not only pump up my tires, but to calculate my IQ.
Wait...the phone's ringing.... Hello? Oh, hi MENSA!
Wait...the phone's ringing.... Hello? Oh, hi MENSA!