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Old 03-19-13, 03:07 PM   #1
Backwoodss
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120 max psi tire and 120 max psi pump

So can I just pump all day long with my 120 psi pump and not have to worry about anything or what?
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Old 03-19-13, 03:16 PM   #2
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Insufficient data

We don't know what pump you have and we aren't the maker, you should call and ask them. Do you really need to pump up to 120 or beyond? Probably not.

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Old 03-19-13, 03:18 PM   #3
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You should call and ask them.
Too easy.
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Old 03-19-13, 03:38 PM   #4
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If it's a hand pump you're probably never going to get to 120 anyway.
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Old 03-19-13, 03:50 PM   #5
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If it's a hand pump you're probably never going to get to 120 anyway.
It is. A specialized air tool mini pump. Thanks.

Also, no I don't need to pump to 120, just wondering if I don't have to worry about over pumping or if I can just go to town. Apparently I can go to town without worry.
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Old 03-19-13, 03:56 PM   #6
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Before I got my big specialized pump with a psi gauge, I used to think I was pumping enough air into my tires that were rated for 110 psi with my small topeak pump. Boy I was wrong. I was well below that in all my bikes, averaging at 20-30 psi. I think you'll be ok.
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Old 03-19-13, 03:58 PM   #7
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Do you weigh 300 pounds?
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Old 03-19-13, 05:51 PM   #8
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Moving this to General as it's not specific to SS/FG.
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Old 03-19-13, 06:04 PM   #9
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Rather than Guess Buy an Accurate tire pressure gage.
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Old 03-19-13, 06:31 PM   #10
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you should not be regularly using a mini pump
you should have a floor pump
a mini pump will usually not be able to get your tires up to sufficient pressure which will lead to flat tires
they are also way harder to use
and you risk breaking your valve stem off the tube if you are not careful

keep the mini pump for emergencies and get a floor pump to keep at home
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Old 03-20-13, 07:45 AM   #11
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Do you weigh 300 pounds?
No, but I am heavy, ~210.


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Originally Posted by fietsbob View Post
Rather than Guess Buy an Accurate tire pressure gage.
I have one.


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Originally Posted by Wilfred Laurier View Post
you should not be regularly using a mini pump
you should have a floor pump
a mini pump will usually not be able to get your tires up to sufficient pressure which will lead to flat tires
they are also way harder to use
and you risk breaking your valve stem off the tube if you are not careful

keep the mini pump for emergencies and get a floor pump to keep at home
have a floor pump.

so I guess you're not gettin it or I'm not being clear. I was out on a ride, just a 6 miler, notice low pressure on my front tire, started pumping and thought, "this pump is a max psi of 120, so are the tires, does that mean it is physically impossible to over inflate these tires with this pump?"
It seems to me, the answer is yes, and that I'll be lucky if it gets to 90 psi after 300 pumps.
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Old 03-20-13, 07:48 AM   #12
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So can I just pump all day long with my 120 psi pump and not have to worry about anything or what?
Neither spec is very useful.

If you think about it, half of the tire/rim interface is the rim. A tire that works fine at 120 psi on some rims will easily blow off old straight sided rims. 120 psi tire without specifying the rim is meaningless.

A "120 psi pump" is pretty much meaningless too. The max pressure you can achieve with any hand pump is limited by how hard you can push the handle. Floor pumps allow you to achieve higher pressures because you can use both arms and the weight of your torso to push down on the handle. Hand pumps force you to stabilize the pump with one hand so you have only the strength of one arm to pressurize the tire. Mini pumps are the worst because they limit the amount of volume of each pump stroke. If your tire has very much volume, you'll get bored before getting up to 120 psi with any mini pump.

A bigger problem than overpressuring is tearing at the base of the valve stem. If you wiggle the valve stem too much during the process of inflating it with your mini pump, you can tear a hole in the inner tube at the base of the valve stem. When that happens, you get to start the whole process over again.

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Old 03-20-13, 08:23 AM   #13
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Originally Posted by Wilfred Laurier View Post
a mini pump will usually not be able to get your tires up to sufficient pressure which will lead to flat tires
they are also way harder to use
I can pump 130 psi and over easily with my mini-pump (confirm with a tire pressure gauge) and it's not really harder to use than my floor pump, just a bit longer
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Old 03-20-13, 09:10 AM   #14
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Quote:
Originally Posted by Backwoodss View Post
have a floor pump.

so I guess you're not gettin it or I'm not being clear. I was out on a ride, just a 6 miler, notice low pressure on my front tire, started pumping and thought, "this pump is a max psi of 120, so are the tires, does that mean it is physically impossible to over inflate these tires with this pump?"
It seems to me, the answer is yes, and that I'll be lucky if it gets to 90 psi after 300 pumps.
you were not being clear
I assumed when you asked if you could just 'pump all day long' that it was the only pump you would be using. I guess what you meant is that you can continuously pump without fear of overpressurizing your tire. This is likely true, but it is quite likely that a master of tire pumping like dramisrcam could actually inflate it more. THe 120 psi limit likely refers to the intended maximum operating pressure, above which components of the pump (like seals or the barrel itself) may fail. Generally the published limit would be somewhat lower than the actual pressure that would damage the pump - like by a factor of 1.5 or 2. But very few people can get a mini pump up over 100 psi due to limitations of the design. The exception are pumps like the Topeak Morph series that are actually miniature floor pumps with a retractable hose... these pumps do not have the same drawbacks as most mini pumps and can reach good pressures.

Unless you had a leak in your tube, your front tire was low during your ride because you don't inflate it often enough with your floor pump. To have a floor pump is not sufficient - you must use your floor pump
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Old 03-20-13, 10:51 AM   #15
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I have a tire gauge at home. I buy a pump, I test it to see what it will do before I go out on the road to avoid any surprises and eliminate any questions.



Quote:
Originally Posted by dramiscram View Post
I can pump 130 psi and over easily with my mini-pump (confirm with a tire pressure gauge) and it's not really harder to use than my floor pump, just a bit longer
I have had several frame pumps that will it 110-120 psi with a real good effort.

I have a couple of mini pumps that will hit 90 psi with some serious effort (Lezyne$45/Blackburn $20/CrankBrothers $30)

If you have a "mini pump" that hits 130 psi with not much more effort than a floor pump, lets have a name. I'm sure several of us would be willing to purchase that same "mini pump"

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Old 03-20-13, 11:12 AM   #16
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you were not being clear
I assumed when you asked if you could just 'pump all day long' that it was the only pump you would be using. I guess what you meant is that you can continuously pump without fear of overpressurizing your tire. This is likely true, but it is quite likely that a master of tire pumping like dramisrcam could actually inflate it more. THe 120 psi limit likely refers to the intended maximum operating pressure, above which components of the pump (like seals or the barrel itself) may fail. Generally the published limit would be somewhat lower than the actual pressure that would damage the pump - like by a factor of 1.5 or 2. But very few people can get a mini pump up over 100 psi due to limitations of the design. The exception are pumps like the Topeak Morph series that are actually miniature floor pumps with a retractable hose... these pumps do not have the same drawbacks as most mini pumps and can reach good pressures.

Unless you had a leak in your tube, your front tire was low during your ride because you don't inflate it often enough with your floor pump. To have a floor pump is not sufficient - you must use your floor pump
Thanks man, exactly the type of answer I was looking for, thank you!

Also, sadly, this is my most successful thread so far I think haha
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Old 03-20-13, 01:59 PM   #17
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If you have a "mini pump" that hits 130 psi with not much more effort than a floor pump, lets have a name. I'm sure several of us would be willing to purchase that same "mini pump"
http://www.louisgarneau.com/ca-en/pr...O_STEPS-G_PUMP
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Old 03-20-13, 02:02 PM   #18
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a master of tire pumping like dramisrcam could actually inflate it more.
I just want everybody to know that I only pump tires
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Old 03-20-13, 02:17 PM   #19
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aha!

It is one of the separate-hose mini-floorpump style. I was worried you were linking to a plastic $6 one from Canadian tire and you and you alone know how to use them to get sufficient tire pressure.

I assure you that mini pumps without separate hoses are next-to-impossible to get up to 100 psi.
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Old 03-20-13, 02:18 PM   #20
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All we can tell for sure is that you'll never be able to over-inflate the tires with that little frame pump. Generally, the rating means that if you can pump fast enough, for long enough, you *might* be able to reach that pressure. If you want accurate inflation, you'll want to get a better (floor) pump and a separate gauge; the gauges on the pumps are 'for entertainment purposes only.'
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Old 03-20-13, 02:26 PM   #21
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Quote:
Originally Posted by fietsbob
Rather than Guess Buy an Accurate tire pressure gage.



Quote:
I have one.




well wail away on the hand pump till you think it's right, then see what the pressure reading is on the pressure gage.
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Old 03-20-13, 04:07 PM   #22
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aha!

It is one of the separate-hose mini-floorpump style. I was worried you were linking to a plastic $6 one from Canadian tire and you and you alone know how to use them to get sufficient tire pressure.

I assure you that mini pumps without separate hoses are next-to-impossible to get up to 100 psi.
This is what I call a mini pump so I ain't no Superman.
The 6$ mini pump from Canadian Tire I call ****.
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Old 03-20-13, 04:28 PM   #23
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All we can tell for sure is that you'll never be able to over-inflate the tires with that little frame pump. Generally, the rating means that if you can pump fast enough, for long enough, you *might* be able to reach that pressure. If you want accurate inflation, you'll want to get a better (floor) pump and a separate gauge; the gauges on the pumps are 'for entertainment purposes only.'
If I pump long enough (not that long) I DO reach 120-125 psi with that pump, I never tried to reach 140 because I don't need to.
The gauge on the pump is accurate as I double check once in a while with a real gauge.
It's not a easy as a regular floor pump but I wouldn't call it hard
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Old 03-20-13, 04:48 PM   #24
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Well it matches my bike

I can't seem to find any reviews or even a dealer around here.

My Lezyne has the removeable hose and honestly.........it sucks. Looks purty though.


pump by gulpxtreme, on Flickr
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Old 03-20-13, 05:22 PM   #25
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Well it matches my bike

I can't seem to find any reviews or even a dealer around here.
I don't find the pump anywhere online. I bought mine at my local lbs last year

As for reviews I don't find any either but you can take my word. When my regular floor pump broke a few month ago I used this one almost on a daily basis for a few weeks and it went very well.

I send an email to the company asking if the pump is still available and if it's available in the U.S.
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