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broken mini pump question

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broken mini pump question

Old 12-20-02, 12:35 AM
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broken mini pump question

i have a topeak mini dx master blaster pump. every time i use it (been having issues with a problematic tire), i wear out a little more of the plastic clamp inside the hole that is used to seal the valve. ideally i suppose my hands should be kept completely still when pumping to minimize the grinding against the threads in the valve. but this seems like an impossible feat to me. am i doing something wrong? are these pumps awful? i'm on my second pump. also, can these pumps really inflate to 60-80 psi? i don't have a pressure gauge, but i can't ever get the tire to inflate to the same level of pressure in the back tire which hasn't been touched since i got the bike a week ago.
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Old 12-20-02, 10:12 AM
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Two points to consider.

1. Most folks I know use a floor pump to inflate tires at home. They are made for frequent use. Their parts are tougher and most have a built in pressure gauge. A mini pump is generally used for on-the-road emergencies (infrequent use).

2. If you have to pump up the tire every day it sounds like you have a leak in the tube or around the valve. Have you taken the tire off and checked for a small hole or a pinch? Check the outside for a hole (glass, nail, etc.) and the inside (rim tape covering the spokes?).
If you have presta valves, do you screw down the knurled cap after inflating?

Just my 2 cents.
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Old 12-20-02, 11:29 AM
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Having a floor pump, with a pressure guage, to inflate the tires at home is much easier. A mini-pump has a very hard time reaching high inflation pressures. If you have a road bike, a Zefal HPX pump is excellent for field inflation and can rather easily reach the high pressure you need, and can be frame mounted. A bonus is that Zefal warranties their pumps forever.
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Old 12-20-02, 12:37 PM
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I love my Zefal.
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Old 12-20-02, 12:49 PM
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Your Topeak should have a warranty too!

As said, a mini is for emergency flat repair, get a floor pump!

BTW, when I use the mini, I hold the head with my left hand and stick my thumb out and brace it against the tire the minimize movement, I use the right hand to pump!

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Old 12-20-02, 01:06 PM
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I have been able to get 80 Lbs of pressure with much effort from my mini pump. Topeak is a reputible brand you may be able to get a replacement part for your pump.

I am not capable of keeping my hands still while pumping air in the tire either. It does help to rest the wheel against your leg or some non moveable object. I agree with RonH, you need a good floor pump and you need to find out why you are having to pump that tire up so often (if you don't already know).

Good luck
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Old 12-20-02, 03:55 PM
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A good alternative to the mini pump is the Topeak Morph. They come for road or MTB use and with the hose connection to the valve you get away from the movement issue. They also have a flip out handle and foot peg. I believe the Road Morph has a gauge. I use the Mountain Morph and can easily get 110 psi in my road tires.

Having said that, I use a floor pump at home.
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Old 12-20-02, 09:22 PM
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i think i've resolved the issue with my multiple flats. however, that little plastic/rubber thing inside the pump hole that closes slightly when i lift the lever (is this the o ring?) has already worn out after a few uses. my second pump this week. is this thing supposed to wear after many uses? is this usually the first part of the pump to break down? or is not supposed to wear down at all? :confused: :confused: :confused:
i will get a regular pump for home use with a gauge also. and i guess i'm a little reluctantly relieved to see that i'm not the only one who has great difficulty pumping a tire up to where it should be with a mini pump.

thanks for all your help.
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