Psimet's tip of the Day
04-23-08, 03:15 PM
#26
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Oh, great. Now I need to bring a calculator and the bathroom scale into the garage each morning.
04-23-08, 03:15 PM
#27
I eat carbide.
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When did you upgrade your rig??
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04-23-08, 03:17 PM
#28
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I'm just glad you didn't post this before RAIN last year, or I would have surely had a pinch flat!
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"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
04-23-08, 03:24 PM
#29
I eat carbide.
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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....
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04-23-08, 03:35 PM
#30
superArti
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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....
04-23-08, 03:42 PM
#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.
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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
04-23-08, 03:58 PM
#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.
04-23-08, 05:23 PM
#33
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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.
04-23-08, 07:11 PM
#34
grilled cheesus
my head hurts. cant someone just pump my tires up for me. this is just crazy. later.
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04-23-08, 07:24 PM
#35
I eat carbide.
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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.
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04-23-08, 07:35 PM
#36
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Wow, according to your formulas I have been inflating my tires to the proper inflation +/- a couple pounds.
04-23-08, 07:37 PM
#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?
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04-23-08, 07:43 PM
#39
the dog ate my earbuds
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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!
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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??!!)
04-23-08, 07:47 PM
#40
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"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
04-23-08, 07:49 PM
#41
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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%
04-23-08, 07:58 PM
#42
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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.
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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
04-23-08, 10:01 PM
#43
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Can't wait for tomorrow's Tip o' the Day. It'll probably involve a slide rule and an astrolabe.
04-24-08, 05:13 AM
#45
175mm crank of love
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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.
04-24-08, 06:38 AM
#46
I eat carbide.
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I have pretty extensive morning meetings this morning. Post the tip near lunchtime. 
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04-24-08, 07:21 AM
#48
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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.
04-24-08, 07:21 AM
#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.
04-24-08, 07:23 AM
#50
Up on the Down Side
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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!
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