leyburnrunner
New Member
- Location
- wensleydale
how do you roadies pump up a tyre at the roadside if you need 100 psi? ive got a pretty good pump but i cant get that kind of pressure...dopey question i know...
road bike puncture
- Thread starter leyburnrunner
- Start date
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hotmetal
Senior Member
- Location
- Near Windsor
Not really a dopey question. The answer is (in my case at least) you don't. It's nigh on impossible with most mini pumps to achieve that sort of pressure (unless you're bionic). I just keep going until my arm gets tired and the tyre feels hard enough to ride on without getting pinch flats.
If anyone knows the secret I'd like to know as well.
If anyone knows the secret I'd like to know as well.
wheres_my_beard
Über Member
- Location
- Norwich
deptfordmarmoset
Full time tea drinker
- Location
- Armonmy Way
I've got one of these... http://www.btwincycle.com/EN/clever-900-with-gauge-9661225/
It's a bit of a hybrid - fairly compact but not very light - but it has a foot lever that folds down so you can use it with the adaptor like a track pump. Well, actually, the foot lever has sheared off so I now have to use it like a pogo stick (necessity being the mother of inflation) but the basic principle still works - body weight against the ground. That said, I usually get bored at 9 bar.
Unfortunately it's coming to the end of its useful life and I don't think they're stocked any more so I'll soon have to look for something else. Shame really because it's a practical design.
It's a bit of a hybrid - fairly compact but not very light - but it has a foot lever that folds down so you can use it with the adaptor like a track pump. Well, actually, the foot lever has sheared off so I now have to use it like a pogo stick (necessity being the mother of inflation) but the basic principle still works - body weight against the ground. That said, I usually get bored at 9 bar.
Unfortunately it's coming to the end of its useful life and I don't think they're stocked any more so I'll soon have to look for something else. Shame really because it's a practical design.
OP
OP
leyburnrunner
New Member
- Location
- wensleydale
what about co2 cartridges?
I use CO2 cartridges with discretion. If I'm miles from home or it's raining I use a cartridge. If I'm relatively close, I just pump and take it easy going home. I'f you're looking at CO2 I'd get a trigger operated holder. It's an additional pocket filler but I've found the genuine innovations one I have to be much more manageable than the pump adapter or screw-on top I've tried.
hotmetal
Senior Member
- Location
- Near Windsor
What sort of pressure can you get from the CO[sub]2[/sub] pumps? And how many bottles do you need to carry to do a tyre? I've thought about CO[sub]2[/sub] but always worried that they won't get enough pressure in, and once you've run out of bottles you're stuffed, so you may have to carry a pump as well.
I use one of these mini pumps when I am out on the road, I can get the pressure up to about 90psi with a little effort. It has a foot which makes it into a mini track pump.
http://www.wiggle.co.uk/topeak-mini-morph-pump/
I do also use co2 cartridges when it is raining and I am a long way from home.
http://www.wiggle.co.uk/topeak-mini-morph-pump/
I do also use co2 cartridges when it is raining and I am a long way from home.
Melonfish
Evil Genius in training.
- Location
- Warrington, UK
mine only needs 70psi or 5bar and even i find the last few pumps a bit tough!
jann71
Veteran
- Location
- West of Scotland
I carry both a pump and co2. A cartridge does 1 road tube. (you get different sizes of cartridge).
If at the side of the road I would use pump to put little bit of air in the tyre and then co2 to inflate to max. Costs about £2 and takes seconds
If at the side of the road I would use pump to put little bit of air in the tyre and then co2 to inflate to max. Costs about £2 and takes seconds
buddha
Veteran
I put 120psi in my rear tyre. Easy peasey with something like the Lezyne Mini Pump. As is like a mini track pump.
It's expensive for a pump. But it's well made, and there are no plasticy bits to break.
It's expensive for a pump. But it's well made, and there are no plasticy bits to break.
hotmetal
Senior Member
- Location
- Near Windsor
That mini morph thing looks quite good, but the foot thingy looks a bit insubstantial.
Quite like the idea of a CO[sub]2[/sub] to augment the pump. I would normally just use a pump if alone but if I'm out with the club, quite a few of them won't wait more than a couple of minutes so a quick pre-pump and a blast of gas might appease the impatient and get me back up and running quicker. Cheers Jann
Quite like the idea of a CO[sub]2[/sub] to augment the pump. I would normally just use a pump if alone but if I'm out with the club, quite a few of them won't wait more than a couple of minutes so a quick pre-pump and a blast of gas might appease the impatient and get me back up and running quicker. Cheers Jann
I have a cheap argos two way pump. I did a two day tour and woke from my overnight to find a puncture. I changed it, pumped it up as best as I could and set off on the second day. I was worried about it as it appeared soft and several times during that day I tried a few more strokes.
When I eventually got it home I checked it with my track pump and discovered it had 85 psi in it. Enough to ride all day without further problems, but not enough to reassure me. That's the main issue for me - I don't know what it actually has in it without a guage, and then worry it hasn't enough.
When I eventually got it home I checked it with my track pump and discovered it had 85 psi in it. Enough to ride all day without further problems, but not enough to reassure me. That's the main issue for me - I don't know what it actually has in it without a guage, and then worry it hasn't enough.
hotmetal
Senior Member
- Location
- Near Windsor
Yes, getting an accurate figure for the pressure you've achieved would be tricky without a gauge. I did actually have a gauge for a bicycle once - it came free with a certain brand of inner tube. However it was so inaccurate that I binned it. I think the rule of thumb, literally, is to depress the tyre with your thumb and see how hard or soft it is compared to how it feels when correctly inflated. If you can hardly compress it then that's probably fine. Not very scientific I admit. All you can do is your best with the pump you have with you. If that proves not to be enough, try to avoid any potholes and maybe get a better pump for next time. I reckon 85psi is alright though, unless you hit a nasty pothole. I think you can just pump it up as best as you can to get you home and not worry too much (if there's nothing more that you can do, worrying won't help).
