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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 08-05-07, 01:18 PM   #1
LessEverything
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Recommended PSI

I am fat (375), my tires say 40-65 psi, well at 60 I am riding them down pretty low. How high should I pump them too?
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Old 08-05-07, 04:13 PM   #2
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65 PSI, and you'll still bulge them a bit, but don't sweat it.
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Old 08-05-07, 06:16 PM   #3
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Is there a tire I should get that doesn't flatten? Seems like a flatter tire would make it harder to pedal.
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Old 08-05-07, 06:21 PM   #4
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Is there a tire I should get that doesn't flatten? Seems like a flatter tire would make it harder to pedal.
Something that's rated for 100 PSI.....

It'll mean a smaller volume tire, but believe it or not it'll also be a faster tire. Look at a 100 PSI slick.

What is the tire you're running now, anyway? I should have asked that to start with.
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Old 08-06-07, 05:52 AM   #5
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Tire Pressure is a fine line between Comfort, Rolling Resistance and Flat Resistance. Too low a pressure and the tire will move under your weight and the possibility of a snakebite flat will occur. Too high a pressure may make the tire creep off the bead in the worst case and also make the ride of the bike a little harsher than it should.

I am a firm believer that the tires and tubes on my bikes be of the highest quality. I look at the thread count in the construction and like to see a higher thread count if at all possible. On my Recumbent, it runs 20 inch tires and has to support a lot of weight in a small diameter. I run a tire on that which will accept 110 psi, and I run it at that pressure. At this pressure, my contact patch is about a 1/2" wide with little squat in the tire.
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Old 08-06-07, 07:43 AM   #6
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LessEverything, if your goal is to lose weight then it's ok that it's a little hard to move around. The increased rolling resistance from the slightly softer tires is your friend for weight loss.

Last edited by Winter76; 08-06-07 at 07:57 AM.
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Old 08-06-07, 01:16 PM   #7
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"my tires say 40-65 psi, well at 60 I am riding them down pretty low."
Even going to 65 will make a noticeable difference!

As Tom asked, what tire are you running?
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Old 08-06-07, 02:27 PM   #8
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The wife and I are both big and I run our tires right at the max. I see no real problem with going a bit higher if you are having snake bite flat problems. Find out what kinds of tires and pressures tandems use. The Santana company makes 4, 5, and even 6 person bikes with 2 x 26" wheels taking a maximum of 1050 pounds.

Last edited by ken cummings; 08-06-07 at 02:28 PM. Reason: typo
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Old 08-06-07, 07:14 PM   #9
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I am fat (375), my tires say 40-65 psi, well at 60 I am riding them down pretty low. How high should I pump them too?
Try 65, if that doesn't work, you need either higher pressure tires the same width, or wider tires the same pressure. It's common, to have some bulge at the bottom, this is one of the benefits of pneumatic tires, that bulge is effectively an air shock. However you don't want a large bulge, because then your more likely to get problems like snake bite punctures, and dented rims, from the rim and pavement getting too close to one another.
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Old 08-06-07, 07:23 PM   #10
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Silly newbie question - pressure is measured with or without load?
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Old 08-06-07, 07:58 PM   #11
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With
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Old 08-06-07, 08:05 PM   #12
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Thanks - that could have been a loud error!
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Old 08-07-07, 05:25 AM   #13
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Depends what type of load?
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Old 08-07-07, 06:33 AM   #14
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Silly newbie question - pressure is measured with or without load?
If you define 'load' as the weight of you on the bike, it is certainly NOT measured this way. Check your pressure with the tires/wheels mounted on the bike. The weight of the bike is the only load you need to worry about.

If you insist on checking/adjusting your pressure while sitting on the bike, please post a pic of this.
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Old 08-07-07, 06:37 AM   #15
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PS- Specialized makes a line of tires called the 'armadillo'. These are very high quality tires designed for touring. They have stiff sidewalls and are kevlar reinforced. You can run them at 100psi, and they will offer great puncture resistance.
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Old 08-07-07, 06:52 AM   #16
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The wife and I are both big and I run our tires right at the max. I see no real problem with going a bit higher if you are having snake bite flat problems. Find out what kinds of tires and pressures tandems use. The Santana company makes 4, 5, and even 6 person bikes with 2 x 26" wheels taking a maximum of 1050 pounds.

Wow! Do you have any photos of these giant multi-tandems?
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Old 08-07-07, 07:23 AM   #17
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Wow! Do you have any photos of these giant multi-tandems?
http://santanatandem.com/Bikes07.html
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Old 08-07-07, 07:25 AM   #18
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If you define 'load' as the weight of you on the bike, it is certainly NOT measured this way. Check your pressure with the tires/wheels mounted on the bike. The weight of the bike is the only load you need to worry about.

If you insist on checking/adjusting your pressure while sitting on the bike, please post a pic of this.
Thanks for setting me straight!
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Old 08-07-07, 07:08 PM   #19
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Brain fart!
Without! Kind of hard to reach when sitting on the bike.
I was in too much of a hurry to watch the game on TV!
You'd find the pressure really doesn't increase very much when you get on the bike.
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Old 08-07-07, 08:34 PM   #20
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Kind of hard to reach when sitting on the bike.
Hey, I figured that's what the wife is for!
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Old 08-10-07, 08:52 PM   #21
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Cool! Thanks.
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