Puncture - issue with tyre

redrabbit

Basic question I know... but:

Yesterday I went to use my bike and realised back tyre was flat. I located a tiny hole and so used one of those patches to cover it up. I put the inner tube back in and levered the tyre back on.

I didn't go out on my bike as it was a bit late by that point. Instead I went to use it today.

However I realised that the side of the rubber tyre has sprung over the edge of the rim, almost like it's not been levered in properly.

So I deflated tyre, levered it back in. I pumped it up and it's fine until it starts getting more air in and then again it pops over the side. It is fully levered in and this has never happened before to me.

Is my rubber tyre needing replacing, or am I just missing something?

navrig2

Some tyres are more difficult to seat in the rims than others.

Keep trying and don't just go from tyre seated to full pressure. Gradually raise the pressure and check it is seated properly - turning the wheel in your hands allows you to follow the side seam and check that it is uniform around the rim.

It can also be worth taking the wheel into the house and letting the tyre warm up so it is more flexible.

Record11Ti

First off, I never ever suggest using a patch unless you are road side.

When you inflate the tire, get it seated, make certain that the tube is not under the bead of the tire. Inflate to about 30 or so PSI, still soft enough to move it but firm enough to take shape.

Go around the rim with your hands and pull the tire away from the bead - straight out, working your way around the tire.

Once you are sure the bead is evenly seated finish inflating to 90psi.

What you are seeing is a bit more common with "wire" bead tires as opposed to "foldable" tires. Also, make sure that what ever punctured the tube to begin with is fixed. You can simply run your thumb down the inside of the casing. If it is something sharp, the item will be right where the streak of blood from your thumb begins.

navrig2

Record11Ti wrote:

First off, I never ever suggest using a patch unless you are road side.

I disagree. I have repaired loads of tubes with patches and never had an issue except where I have not let the adhesive go tacky properly. Patches are perfectly adequate for repairs.

Roadside - I always replace the tube.

simon_masterson

Navrig2 wrote:

Record11Ti wrote:

First off, I never ever suggest using a patch unless you are road side.

I disagree. I have repaired loads of tubes with patches and never had an issue except where I have not let the adhesive go tacky properly. Patches are perfectly adequate for repairs.

Roadside - I always replace the tube.

Indeed, they form the strongest part of the tube if you do it right (try taking it off again), it's a very basic task (so you shouldn't be getting it wrong), so there really is no excuse to throw tubes away rather than repair them. You hear old wives' tales about the maximum number of patches you can put on, too. My spares have many.

Self-adhesive patches on the other hand aren't as good (though they can last long term), and barely more convenient.

Daz555

Record11Ti wrote:

First off, I never ever suggest using a patch unless you are road side.

Eh?

Roadside - swap the tube. Patching at home is exactly the right thing to be doing.

Record11Ti

I guess I should have said that I would never use a patch - unless I was roadside, and had no other option. I rarely flat (thanks to good tires I maintain). I can however feel a patched tube if the patch is under the tread. Even more so on a better tire (Michelin Pro4 w/thin tubes @ 95psi.

I have seen some folks who do road side vulcanizing patches who mess up and patch their tube to the carcass as well (when in a hurry) Then again, I train and race on the same tire (but for early spring when there is salt all over the road). There are many advantages, including that the higher TPI is less prone to pesky flats. Also, it is a good idea than when you are bored take out some tweezers and clean any sand and grit from any small nicks in the treads of your tires...especially on your Dugast tubulars or Open Corsa Evo's...spends flats there.

Record11Ti

If you can feel your patches you need better quality patches.

As I said, I dont patch my tubes. I have in the past, hands down you can feel a patch in a tire. Even more so on the Velodrome.

Record11Ti

Yes on the velodrome where you run 160psi but I can't feel propper roadie patches. The ones that come to a sharp edge and they're only as thick as a light-weight tube.

I always can. Maybe it is the stiff bikes I ride. I can ALWAYS feel a patch thump thump thump...currently I am on a full custom Ti ride w/Record EPS - I am sure I can still feel a patch under a Pro Race 4.

navrig2

Record11Ti wrote:

Yes on the velodrome where you run 160psi but I can't feel propper roadie patches. The ones that come to a sharp edge and they're only as thick as a light-weight tube.

I always can. Maybe it is the stiff bikes I ride. I can ALWAYS feel a patch thump thump thump...currently I am on a full custom Ti ride w/Record EPS - I am sure I can still feel a patch under a Pro Race 4.

Does that make you in line for the throne :roll:

desweller

To the OP: do not use tyre levers to fit the tyre. You run the risk of getting the tube between the tyre and the rim; which sounds like what is happening.