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Old 09-27-15, 04:48 PM   #1
Herbert25
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Optimal tube pressure for 26" x 1.95" tyres

My weight is 210lbs / 96kg.

Could someone please give me a rough idea of the psi I should pump my tyres up to?

Thanks for any help,

Herbert25
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Old 09-27-15, 06:30 PM   #2
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I don't use anything that fat, but I'd guess 50-60 PSI.
Adjust for your road conditions. Too hard on rough textured pavement may give too much "road buzz".
Too soft and you may "bottom out" the tire in a bad pot hole and bend the rim.
Use what feels good to you for the conditions.
You'll probably want about 5 PSI more in the rear.
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Old 09-27-15, 06:52 PM   #3
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I would think 41 on the front and 44 on the rear would be the ideal starting point, anything over 50 or below 35 seems too high or too low for that size tire and body weight. Of course ground conditions could change that a bit, but like I said that is the starting point, you adjust from there.
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Old 09-27-15, 07:33 PM   #4
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Quote:
Originally Posted by Herbert25 View Post
My weight is 210lbs / 96kg.

Could someone please give me a rough idea of the psi I should pump my tyres up to?

Thanks for any help,

Herbert25
When I was that weight I ran my tires between 45 and 55 PSI.

Brad
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Old 09-27-15, 09:05 PM   #5
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What type of riding? For smooth pavement, you'll want to start at the upper end of the ranges given. For off-road riding, you'll generally want to start in the middle of the range, and work down to maximize the traction.
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Old 09-27-15, 10:42 PM   #6
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Rule of thumb is the tire sags 15% of its thickness with your weight on it. Assuming 70% of your weight is on the rear wheel, 47psi rear, and about 37psi front.

This is just a starting point. Most people way over inflate large tires.
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Old 09-28-15, 06:04 AM   #7
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Tire pressure calculator - 15% drop
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Old 09-28-15, 07:40 AM   #8
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There should be a pressure range molded into the side of the tire somewhere to give you an idea.

Personally, depending tire style and where I was riding, I'd probably go: 45-50 street; 30-35 off road.
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Old 09-28-15, 07:50 AM   #9
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I'd go with 40F/50R and see how it feels.
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Old 09-28-15, 08:56 AM   #10
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that's a good site for road bike tires, has no bearing on mtb tires, for that you need this calculator: MTB tech

If you note on that calculator it doesn't have the next size down below 2.0 to 2.2, but you use some math you'll note that from 2.0-2.2 to 2.2-2.4 there is a 3 pound decrease both front and rear for a 210 pound person, thus all you need to do to get a 1.95 size tire psi is to increase the pressure given for 2.0-2.2 by 3 pounds front and rear of course.
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Old 09-28-15, 09:35 AM   #11
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Or any pressure that feels good up to the max listed on the tire. I generally run about 10% below the max listed. this helps to prevent snake bite flats.
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Old 09-28-15, 09:58 AM   #12
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http://www.bikequarterly.com/images/TireDrop.pdf

https://docs.google.com/spreadsheet/...l=en_US#gid=31

http://bccclub.org/documents/Tireinflation.pdf



Read these & follow their recommendations. Trust the engineers who design, test & make bicycle tires.

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Old 09-28-15, 10:02 AM   #13
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I weigh 400 lbs and I run 40mm tires at 65 psi so your near 50mm tires should be fine quite a bit below 65psi.
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Old 09-28-15, 11:42 AM   #14
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Originally Posted by Joe Minton View Post
http://www.bikequarterly.com/images/TireDrop.pdf

https://docs.google.com/spreadsheet/...l=en_US#gid=31

http://bccclub.org/documents/Tireinflation.pdf



Read these & follow their recommendations. Trust the engineers who design, test & make bicycle tires.

Joje
That is all good info, but the first one and the last one is for road bikes, there is no info on what the idea pressure is for a certain size mtb tire, the second one is the only one that has mtb info but it's too limited to just one size and no idea where the spreadsheet came from, the site I gave is the only calculator that I found for MTB tires and weights being carried, your spreadsheet may be based on that same info but the calculator is much easier to use. Not sure if I'm reading your spreadsheet correctly but it looks like it's recommending for a 400 pound person just 10 psi on the front! That's not going to work.

Again here is that calculator: MTB tech
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Old 09-28-15, 12:47 PM   #15
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What is the Imprinted pressure range as the tire is labeled ?
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Old 09-28-15, 03:56 PM   #16
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i keep mine at 50psi
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Old 09-28-15, 07:46 PM   #17
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What is the Imprinted pressure range as the tire is labeled ?
If a range is printed on the tire, then it's best to follow the range, if you use the calculator I gave earlier and find that with your weight you're below the minimal limit on the tire then inflate to the minimal recommendation on the tire. You can go safely 10% above and below a printed PSI limit on a tire, but company lawyers want those psi limits like that so the company can't get sued if someone used too much pressure. If you find that your weight will make your psi exceed the max tire rated psi then you need to go to the next size up tire, and the flip side is if the your weight is so lower and you reach a psi significantly lower than the minimal rated psi you should go down in tire size.

These are all shoulds, not you have too, but if you want the tire to have the best traction and wear you need to have enough pressure with the weight applied to it that it was design to give.
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Old 09-29-15, 05:37 PM   #18
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I'd go with 45F, 50R and see how that goes.
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