Urban75 Home About Offline BrixtonBuzz Contact

How was your cycle commute?

I've a question to all you lovely (well:)) cycling types..
It appears that I've a super-mega-hyper slow puncture. Went through a few inner tubes and a change of tyres to try and find out what the problem is/was. Still don't know. The incumbent :) tube has been inspected painfully deliberately and thoroughly (including hunting for bubbles in the sink). Nothing! ... Yet once pumped it goes flat overnight. Is there something obvious that I don't know about/ can't see?
Merci a tous
 
check your tyre for sharps: run your finger around the inside and outside of the tyre and feel for any sharp, pointy bits. pry any pointy menaces out with a fork or what have you. Do you have rim tape? you should do, tho if not, get some from your LBS - it stops the rough edges of the spokes on the inside of your rim from abrading your tyre when fully inflated. If all that fails, d-lock yourself in the face and take a bus.
 
smorodina said:
I've a question to all you lovely (well:)) cycling types..
It appears that I've a super-mega-hyper slow puncture. Went through a few inner tubes and a change of tyres to try and find out what the problem is/was. Still don't know. The incumbent :) tube has been inspected painfully deliberately and thoroughly (including hunting for bubbles in the sink). Nothing! ... Yet once pumped it goes flat overnight. Is there something obvious that I don't know about/ can't see?
Merci a tous
Click to expand...
rim tape ?
 
smorodina said:
I've a question to all you lovely (well:)) cycling types..
It appears that I've a super-mega-hyper slow puncture. Went through a few inner tubes and a change of tyres to try and find out what the problem is/was. Still don't know. The incumbent :) tube has been inspected painfully deliberately and thoroughly (including hunting for bubbles in the sink). Nothing! ... Yet once pumped it goes flat overnight. Is there something obvious that I don't know about/ can't see?
Merci a tous
Click to expand...
If the of tyre is ok, the rim might have a sharp bit. And is the tape thing that runs round the metal part ok, still?
 
If it's a valve that uses a lockring, don't screw the lockring down until after you've pumped it up.
 
joustmaster said:
If you are spending every cycle journey shouting and getting stressed.. Maybe it's you that doesn't have a clue.
Click to expand...
I'm not stressed, I'm testing my horn and making videos - and collecting idiots' reg numbers to put on Youtube.
Don't mistake it for anger, it's contempt.
 
smorodina said:
yep, it's new
could be that! thanks

thank you all:)
Click to expand...
Still sounds like there may be a sharp edge around that area. I do pay attention to getting all the inner tube inside the tyre, but I'm not THAT careful.
While the tube is half-inflated, I tend to whack the tyre on the ground... sometimes I'll over-inflate then let it down again ..
Do you use levers when fitting the tyre ?
 
weepiper said:
It's your hobby.
Click to expand...
I would rather it wasn't.
I keep reading about the pathetic sentences drivers are getting for "accidentally" killing cyclists ..

Look at this little sequence from this morning.
For a lot of drivers, the default is foot on the floor and every braking is an emergency - even near a school..



This happens at this point at least once a week.
 
smorodina said:
sure... probably need to get some posh tacx next time i'm at the workshop.. looks like i'll go there this weekend... :(
Click to expand...
gentlegreen said:
What I mean is you shouldn't if you can possibly help it.
You say the tube tests OK after you've removed it ?
Click to expand...

If you were pinching the tube with tyre levers as you're refitting it it wouldn't hold air at all - that makes quite a big hole.
 
gentlegreen said:
What I mean is you shouldn't if you can possibly help it.
You say the tube tests OK after you've removed it ?
Click to expand...
correct. that's what's so puzzling - i pump it up, leave it stationary overnight, it's dead flat in the morning, i can't be bothered, and after feeling sorry for myself for an appropriate amount of time:D take the tube..

weepiper said:
If you were pinching the tube with tyre levers as you're refitting it it wouldn't hold air at all - that makes quite a big hole.
Click to expand...
exactly:) this was eliminated after i couldn't find the bloody hole even in the sink full of water.

i am curious if it's the valve that lets the air out.. will get a new tube and test that
 
smorodina said:
It appears that I've a super-mega-hyper slow puncture. Went through a few inner tubes and a change of tyres to try and find out what the problem is/was. Still don't know. The incumbent :) tube has been inspected painfully deliberately and thoroughly (including hunting for bubbles in the sink).
Click to expand...

Checking for bubbles in a sink is usually a Good Idea. However the inner tube will only have a few PSI in it. When you pump it up inside the tyre you're putting a LOT more PSI in which can leak air that a few PSI couldn't get past. So the bubbly sinky test isn't infallible.

My initial thought was a leaky valve. But then you seem to have tried multiple inner tubes and tyres if I read your post correctly. Therefore it has to be something intrinsic to the wheel or the way in which you are fitting the tyre. To rule out the latter get someone else to fit the tyre for you. I'd take the wheel to a proper bike shop for them to check it.

You're not using CO2 to inflate the tyre are you?
 
a_chap said:
You're not using CO2 to inflate the tyre are you?
Click to expand...
no, just a normal joe blow
yes, taking it to the shop tomorrow.
it really must be the wheel, because come to think of it, i've replaced the rims last summer, and i think my problems started then!
 
so the copper just came round about my accident
didn't call i advance :mad: so was on the toilet

was almost instantly abrasive about me accepting money and what a court would think if i took it further etc, asking me what i wanted out of it etc
i said that i didn't know and at the moment was reporting the accident as i felt i had a duty to, especially if the cab driver wasn't going to
took a pic of my injuries and said he was off to speak to the driver
 
The gates to the bike shed were being guarded by a pair of Canada geese, so it really must be the first day of spring. :)

Oh and someone within earshot is shooting at something with a 12-bore. :(
 
I got off and walked on my traffic-infested hill again - but I started even earlier and caught up with the car I was stuck behind.

0.16 miles, downhill -3.84 MPH - 2 minutes 30 seconds of walking, versus the same time sitting on the brakes versus a somewhat iffy filter...

It has the added benefit of blocking the way of selfish pavement cyclists - I swear I'm routinely mistaken for a copper sometimes - and there are a few around on bikes at the moment.
 
My young colleague tacoed his back wheel and before I could stop him, went off and bought a new wheel for about 30 quid - including an 8 speed screw on freewheel cassette. :hmm: (I'd only replaced his whole transmission less than a year ago) - so he probably needs a new chain - perhaps I'll swap his part-worn cassette and chain for a new chain ..

That's roughly what I paid for my XT hub.

Rim is a Weinmann as23x - certainly not one for off-road - but he does a fraction of the miles I do and his main problem is components rotting through being parked outside...

Perhaps it's roughly the equivalent of the cheap 27 inch wheels - steel first, alloy later I used to buy from Halfords with depressing regularity back in the late 80s ...
 
You must log in or register to reply here.

Similar threads

TopCat
Ceramic coatings for new cycle
Replies
3
Views
336
TopCat
TopCat
A
First car / how do people afford cars when in low paid work?
2
Replies
59
Views
1K
Chz
Chz
TopCat
Brompton folding cycles
2 3
Replies
74
Views
2K
TopCat
TopCat
fucthest8
Hybrid e-bike for commuting
Replies
12
Views
541
newme
newme
kalidarkone
How much should I sell my van for?
2
Replies
33
Views
1K
kalidarkone
kalidarkone
Back
Top Bottom