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Wth?

Old 03-30-21, 04:30 PM
  #1  
taylorgeo
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Wth?

I was putting air in my tire with this new pump I purchased, and the pump heated up like hot dog right off the grill.

Can someone recommend a pump – or a catcher's mitt?

Tire size is 26" x 2.0"


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Old 03-30-21, 04:58 PM
  #2  
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Topeak road morph. Just replace mine with the same one after 10yrs of service.
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Old 03-30-21, 05:02 PM
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Maybe a little silicon lubricant on the pump’s piston! Also maybe slow your “cycle rate” down a bit.
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Old 03-30-21, 05:04 PM
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Physics. If you were to inflate a 26 x 2.00 tire from 0 psi to full pressure, any mini pump of that size would heat up as much as yours did.

A larger mini pump would get the job done faster and probably wouldn't reach the same temperature, but for keeping your tires properly inflated, a floor pump with a gauge is the way to go.
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Old 03-30-21, 05:40 PM
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Sy Reene
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Just do a CO2 chaser and hold the cartridge bare-handed.
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Old 03-30-21, 05:43 PM
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Isn't that just Charles' Law?
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Old 03-30-21, 06:25 PM
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My Topeak road morph is actually still going strong after ten years so that’s another mention/vote right there.
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Old 03-30-21, 06:32 PM
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My Lezyne heats up and when I get to about 75% I stop and let the pump cool down. Two reasons for this, I don't want to wreck the pump and second I need a rest. If you are replacing your tube at the side of the road, use the old tube and wrap it around the pump to insulate it from your hand.
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Old 03-30-21, 07:45 PM
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When air is highly compressed it gets hot. Think about how a diesel engine works
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Old 03-30-21, 07:51 PM
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That particular action on those frame pumps make guys revert back to their teenage years and they go way too fast...slow it down son.
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Old 03-30-21, 08:38 PM
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taylorgeo
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Originally Posted by sovende View Post
Maybe a little silicon lubricant on the pump’s piston! Also maybe slow your “cycle rate” down a bit.
Good point on the "cycle rate."

Originally Posted by Trakhak View Post
Physics. If you were to inflate a 26 x 2.00 tire from 0 psi to full pressure, any mini pump of that size would heat up as much as yours did.

A larger mini pump would get the job done faster and probably wouldn't reach the same temperature, but for keeping your tires properly inflated, a floor pump with a gauge is the way to go.
Looks like I'm buying a larger mini pump. Have a floor pump at home.

Originally Posted by texaspandj View Post
That particular action on those frame pumps make guys revert back to their teenage years and they go way too fast...slow it down son.
LMAO
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Old 03-30-21, 08:52 PM
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On the Topeak website there are 33 mini pumps that have a capacity ranging from 60 PSI to 160 PSI.

My tires have a PSI range from 35-70.

Does it matter which pump I get?
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Old 03-30-21, 08:57 PM
  #13  
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Lots of people around here love the Topeak mini pump that's been mentioned.

I have a couple of Silca Tattico mini pumps, and they don't heat up -- very intelligent design with a heat sink and some insulation between the air chamber and the grip.
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Old 03-30-21, 09:07 PM
  #14  
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I use a Topeak Peak DXII as a portable pump for a mountain bike tire. Even though 26x2.0 is that large of a tire, I think the mini would just make it take even longer.

It only goes to 90psi, but I would think that is more than enough.

John
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Old 03-30-21, 09:18 PM
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It's an air pump not a diesel piston. Stroke slow.
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Old 03-31-21, 11:21 AM
  #16  
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home: floor pump road: CO2 Even a cold minipump is a major pain to use. Touring, OK, maybe. But if I can't get done with 3 cartridges on the road, I'm using the phone.
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Old 03-31-21, 11:35 AM
  #17  
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Originally Posted by Chris! View Post
Topeak road morph. Just replace mine with the same one after 10yrs of service.
I discovered the Road Morph G in 1999 when I rode across the U.S. with twelve others. Two members of the group had them The rest of us would frequently borrow them. When I got home I picked up one for myself. Like you, I have only had to replace it once. My only complaint about it is that the pressure gauge is not nice to aging eyes like mine.
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Old 03-31-21, 11:45 AM
  #18  
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Originally Posted by taylorgeo View Post
I was putting air in my tire with this new pump I purchased, and the pump heated up like hot dog right off the grill.

Tire size is 26" x 2.0"
Time for a new bike

















;-)
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Old 03-31-21, 12:01 PM
  #19  
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Normally yes Topeak road morph but I think the Mountain Morph is the better option for this situation. However any pump will generate heat after prolonged usage.

Never heard of Pro Bike Tools but Shimano does do tools under Pro but they also do some saddles, bars and other stuff as well, kind of an odd choice of names but it doesn't look like a terrible pump.
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Old 03-31-21, 02:02 PM
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PV = nRT. It's not just a good idea. It's the law.
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Old 03-31-21, 04:42 PM
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I wouldn't fill any tire with a pump that size. I might top them off. Or if my CO2 didn't inflate it enough on the road, I might use that. But again, just to top of the partially filled tire.

If you don't want to use CO2, I'm okay with that. But carry a bigger frame mounted pump so you can get the tires inflated before dark.
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Old 03-31-21, 05:35 PM
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That's why air compressor cylinders have cooling fins. It takes a lot of work to fill those big tires with such a small pump. Mini-pumps are great - I have quite a few, but I do prefer a larger frame-fit pump.
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Old 04-03-21, 12:02 PM
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Originally Posted by alcjphil View Post
When air is highly compressed it gets hot. Think about how a diesel engine works
Glow plugs?
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Old 04-03-21, 04:55 PM
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Originally Posted by caloso View Post
Isn't that just Charles' Law?
Not really. Charles law describes the change in temperature or volume for a constant pressure. What you are looking for is the combined gas law which combines Charle’s Law (V=kT), Boyles Law (V=k/P), and Guy-Lussac’s Law (P=kT). Whip them all together and you get the Combined Gas Law: PV/T = k.

Originally Posted by Daniel4 View Post
It's an air pump not a diesel piston. Stroke slow.
Won’t matter. The above doesn’t depend on rate. Increase the pressure by deceasing the volume and you end up with a higher temperature. You lose some heat due to radiation and convection but that’s only a small part of the equation.
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Old 04-05-21, 01:59 PM
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Originally Posted by cyccommute View Post
Not really. Charles law describes the change in temperature or volume for a constant pressure. What you are looking for is the combined gas law which combines Charle’s Law (V=kT), Boyles Law (V=k/P), and Guy-Lussac’s Law (P=kT). Whip them all together and you get the Combined Gas Law: PV/T = k.



Won’t matter. The above doesn’t depend on rate. Increase the pressure by deceasing the volume and you end up with a higher temperature. You lose some heat due to radiation and convection but that’s only a small part of the equation.
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