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Tyre inflation

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  • January 16, 2018 at 3:58 pm #28030
    Boatsie

    I bought a 130psi hand pump.
    I had to use it today.
    I went to leave work and noticed my front was flat.
    A Maxxis refuse 700*28c with an inner and outer tube protector. I pulled a 4 mm deep thorn from the tire, pulled the tube out, the tube appears to be non punctured so I reassembled and rode home. The rear had deflated too.
    I guess a work mate is helping me learn..
    Anyway having inflated both tires, upon getting home I added more pressure using a decent floor pump.
    I seem to achieve 30-40 psi using the hand pump! Is this normal? I rarely get punctures, I can’t remember the last tube that was punctured yet I wouldn’t want to ride 30km upon the pressure achieved from my hand pump!
    I use 2 road bikes. Both use the same front rim; a refuse 28. 1 rides both refuse 28. The other being tonights bike rides a session 28 rear (a lot more volume with no problems at 40 psi).

    Did I get sucked into a did road bike pump?
    A Samurai bbb/bmp-50 mini pump.

    Any suggestions please per road side 100psi?
    My best guess is to purchase a co2 inflator to do the effort bit of 30-100psi with.
    Next best guess is a larger volume higher pressure pump.

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  • January 17, 2018 at 11:12 pm #910203
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    Boatsie

    sergius wrote:

    sergius wrote:

    A mini-pump never runs out, yes you can’t get the pressures as high as a track pump or a canister – but the increased reliability of the solution makes it a winner for me.

    Totally agree.. My mate was saying yesterday regarding his mini pump. He’s achieving 100psi roadside. Not much effort, merely duration. I bought some co2 from eBay at $1 a bottle with free in flat or and hopefully they are just luggage. Yet coming in under the weight of a chocolate bar to carry 2, I don’t mind the thought that I’ll soon have extra security against praising the bicycle on the side of the road using humming bird technique. Lol.
    Wondering if the warmth from the pump barrel will defrost winter hands.

    January 17, 2018 at 4:21 pm #910201
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    sergius

    It takes upwards of 140

    It takes upwards of 140 strokes on my mini-pump to get to about 60PSI on my 25mm tyres.  I can never be bothered to go beyond that – just top it off properly when you get home.

     

    Different tools for different situations… I don’t use CO2 as I refuse to be stuck at the side of the road having gone through all my canisters – all it takes is a duff spare tube for example (as has happened to me).

    A mini-pump never runs out, yes you can’t get the pressures as high as a track pump or a canister – but the increased reliability of the solution makes it a winner for me.

    January 17, 2018 at 3:37 pm #910199
    0
    Boatsie

    I feel like a retard aye.
    I feel like a retard aye.
    Thanks much with the advice.
    Rim tape, yes. . Is on the agenda to replace. Is lumpy.
    Due to the slits (explosion) I’m pretty sure it’s as iandusud mentioned. Bead pinching.
    I took my time last tube. Inserted. Slightly inflated. Pushed valve stem up, cleared bead near valve stem. Pulled valve stem down and screwed into rim hand fastened. Inflated more. Walked fingers around rim such that tube nested up in the tire away from the bead. Then took a couple of minutes pumping.
    I was wrong about pump, works easy and perfect. Just small volume each stroke.
    From no punctures to four in a row woke me up a little bit.
    Cheers per co2 advice. I wanted to avoid such yet knowing the cold will soon be here I ain’t wanting to grasp a small pump and feel my legs cool down.
    I still feel like an idiot.. Hoping a puncture free remainder of year. 🙂

    January 17, 2018 at 10:46 am #910197
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    iandusud

    When you fit your tube make

    When you fit your tube make sure you have some air in it so that it sits inside the tyre before you push the bead of the tyre over the rim. If not what happens is that you risk trapping a bit of the tube under the bead of the tyre. Then when you pump it up it air will slowly creap under the bead into the trapped section of tube and it will explode with a mighty bang. I ran a bike shop for many years and this was a regular occurance on new bikes. The tyres would be inflated at the factory but not to high pressure. We would prepare a bike, including pumping up the tyres properly, and put it on display. Anything from a few minutes up to a few hours later there would be an almighty bang like a gunshot. Any poor customer nearby would get the fright of their life!

    January 17, 2018 at 8:55 am #910195
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    hawkinspeter

    You might have an issue with

    You might have an issue with your rim tape. It’s the tape that goes around the rim and protects the inner tube from the spokes/nipples/holes. It’s quite easy to move it or damage it when fitting a tyre and that can cause a sudden puncture if the inner tube is pressing against a sharp bit of the rim. Check the tape and if necessary, move it to cover any spokes/holes and try again.

    January 17, 2018 at 7:35 am #910193
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    StraelGuy

    CO2 is my go to. Remember CO2
    CO2 is my go to. Remember CO2 seeps through rubber quite quickly so when you get home, empty the tyre and reinflate with a track pump.

    January 16, 2018 at 11:55 pm #910191
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    Boatsie

    Another explosion.
    Another explosion.
    I must be the worst tube fitter ever.
    Not to worried, still about 20 spare tubes to go.
    From experience, once sitted properly, should last long time..

    Wondering regarding side road pumping.. Ordered co2. I guess that’s pretty much the norm now.

    Doh had thought regarding bedding tube. Would riding a 100 metres at 30 psi then inflating to 100psi save exploding tubes please???

    January 16, 2018 at 11:33 pm #910189
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    Boatsie

    I’m just surprised.
    I’m just surprised.
    While asleep the rear exploded. A morning look found a 5mm thorn that had punctured the tube and another similar metal rod embedded in the tire.
    Doh. . Exploded again.
    Must be 1 of them days.

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