After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was now
far to big to fit the rim....is this normal ?

On Thu, 18 Oct 2018 11:36:28 +0100, "Jim GM4DHJ ..."
wrote:

After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was now
far to big to fit the rim....is this normal ?

It's the bead that normally determines how well a tyre fits a rim and
as they are normally kevlar or steel I find it had to see how it could
have 'grown'?

Cheers, T i m

Well they do, or at least used to when I could use a bike.
Brian

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"T i m" wrote in message
...
On Thu, 18 Oct 2018 11:36:28 +0100, "Jim GM4DHJ ..."
wrote:

After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was now
far to big to fit the rim....is this normal ?

It's the bead that normally determines how well a tyre fits a rim and
as they are normally kevlar or steel I find it had to see how it could
have 'grown'?

Cheers, T i m

On Thu, 18 Oct 2018 18:00:12 +0100, "Brian Gaff"
wrote:

Well they do, or at least used to when I could use a bike.

Can't say it's something I've ever experienced over 50 years and many
bikes (currently 10 solos between us, a cycle trailer and tandem).

Maybe I've never had a bike (or tyre) that might be likely to suffer
such?

Presumably you could have a tyre come off the rim when is use then
(after being on there with no issues for some time)?

Cheers, T i m

T i m wrote:
On Thu, 18 Oct 2018 18:00:12 +0100, "Brian Gaff"
wrote:

Well they do, or at least used to when I could use a bike.

Can't say it's something I've ever experienced over 50 years and many
bikes (currently 10 solos between us, a cycle trailer and tandem).


Nor me. It just doesnt happen. The stored tyre must have been for a
different wheel.

Tim


--
Please don't feed the trolls st have been for a different wheel.

On 18/10/2018 11:36, Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was now
far to big to fit the rim....is this normal ?


When the inner tube is inflated, doesn't it push the bead out into the
correct location on the rim?

Nick

"Nick Odell" wrote in message
news
On 18/10/2018 11:36, Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?


When the inner tube is inflated, doesn't it push the bead out into the
correct location on the rim?

Nick

no that was the strange thing...it was far to large a diameter to even come
near the rim with the tube inflated.....never mind it is in the bin
now..........

Beads on older tyres were not so sophisticated. It was often just a denser
rubber.
Brian

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"Jim GM4DHJ ..." wrote in message
...

"Nick Odell" wrote in message
news
On 18/10/2018 11:36, Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?


When the inner tube is inflated, doesn't it push the bead out into the
correct location on the rim?

Nick

no that was the strange thing...it was far to large a diameter to even
come near the rim with the tube inflated.....never mind it is in the bin
now..........

"Tim Streater" wrote in message
.. .
In article , Jim GM4DHJ ...
wrote:

"Nick Odell" wrote in message
news
On 18/10/2018 11:36, Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28
inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?

When the inner tube is inflated, doesn't it push the bead out into the
correct location on the rim?

no that was the strange thing...it was far to large a diameter to even
come near the rim with the tube inflated.....never mind it is in the bin
now..........

Did you not join the dots? Or perhaps it was caused by you tearing
along the dotted line.

.........that will be it...tee hee

"Nick Odell" wrote in message
news
On 18/10/2018 11:36, Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?


When the inner tube is inflated, doesn't it push the bead out into the
correct location on the rim?

Nick

no far too big a dia..

"Jim GM4DHJ ..." wrote in message
...
After a puncture and a ruined tyre I tried to put back on an old 28 inch bike tyre that
WAS on the bike years ago only to find its diameter was now far to big to fit the
rim....is this normal ?


It may have been on that bike are you sure was it on the same (sized)
wheel ? Given its possible to fit different size wheels on the same
frame by way of replacements, etc.

Non folding bike tyres have a continuous wire mouded into the bead
which snaps over the rim. While its conceivable that the joint in
this wire may have failed that wouldn't explain why the rubber has
stretched as well


michael adams

....

"michael adams" wrote in message
o.uk...

"Jim GM4DHJ ..." wrote in message
...
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was
now far to big to fit the rim....is this normal ?


It may have been on that bike are you sure was it on the same (sized)
wheel ? Given its possible to fit different size wheels on the same
frame by way of replacements, etc.

Non folding bike tyres have a continuous wire mouded into the bead
which snaps over the rim. While its conceivable that the joint in
this wire may have failed that wouldn't explain why the rubber has
stretched as well


michael adams

yip 28 inch

On Thu, 18 Oct 2018 12:43:41 +0100
"Jim GM4DHJ ..." wrote:

yip 28 inch


English "28 inch" or German "28 inch"? There's half an inch difference
in the diameter of those.

"Rob Morley" wrote in message
news:20181020233448.60296533@Mars...
On Thu, 18 Oct 2018 12:43:41 +0100
"Jim GM4DHJ ..." wrote:

yip 28 inch


English "28 inch" or German "28 inch"? There's half an inch difference
in the diameter of those.

So does Germany actually use "28" in the specification of its wheel
diameter? It must be one of the few measurements in the imperial system that
has survived Europe's use of the SI metric system. Are there any other cases
where items are sold in imperial units (as opposed to being an integer
number of inches which is translated into metric *)? If there is 1/2 inch
difference in diameter of English and German 28" wheels, which one is the
true diameter that you would measure? Is one the external diameter of the
rim and the other the diameter of the tyre bead which is slightly smaller
and has to be levered over the rin?

Incidentally, has anyone actually had to use tyre levers for fitting a
bicycle tyre? I always find that I just tuck the bead in at one side, then
ease it in by moving my thumbs towards the opposite side and then pull it
away from the rim at the very opposite until it pops into place; and vice
versa for removing. You'd think that a lever would be needed at least to
make the bead pop out from the rim when removing, but I've never found one
necessary. Am I unusual?


(*) For example I doubt whether 5 1/4 and 3 1/2 inch floppy and hard disks
are/were advertised that way in Germany, France etc - they'd be specified in
millimetres.

"NY" wrote in message
news
"Rob Morley" wrote in message
news:20181020233448.60296533@Mars...
On Thu, 18 Oct 2018 12:43:41 +0100
"Jim GM4DHJ ..." wrote:

yip 28 inch


English "28 inch" or German "28 inch"? There's half an inch difference
in the diameter of those.

So does Germany actually use "28" in the specification of its wheel
diameter? It must be one of the few measurements in the imperial system
that has survived Europe's use of the SI metric system. Are there any
other cases where items are sold in imperial units (as opposed to being an
integer number of inches which is translated into metric *)? If there is
1/2 inch difference in diameter of English and German 28" wheels, which
one is the true diameter that you would measure? Is one the external
diameter of the rim and the other the diameter of the tyre bead which is
slightly smaller and has to be levered over the rin?

Incidentally, has anyone actually had to use tyre levers for fitting a
bicycle tyre?

Yes, I used to more than half a century ago now when I used to ride one.

I always find that I just tuck the bead in at one side, then ease it in by
moving my thumbs towards the opposite side and then pull it away from the
rim at the very opposite until it pops into place; and vice versa for
removing. You'd think that a lever would be needed at least to make the
bead pop out from the rim when removing, but I've never found one
necessary. Am I unusual?

Yep, never encountered anyone doing it like that.

(*) For example I doubt whether 5 1/4 and 3 1/2 inch floppy and hard disks
are/were advertised that way in Germany, France etc - they'd be specified
in millimetres.

On Sun, 21 Oct 2018 10:43:06 +0100
"NY" wrote:

"Rob Morley" wrote in message
news:20181020233448.60296533@Mars...
On Thu, 18 Oct 2018 12:43:41 +0100
"Jim GM4DHJ ..." wrote:

[...]

English "28 inch" or German "28 inch"? There's half an inch
difference in the diameter of those.

So does Germany actually use "28" in the specification of its wheel
diameter?

You'll still see their traditional "28 x 1-5/8 x 1-3/8" marked on the
side of many tyres.

It must be one of the few measurements in the imperial
system that has survived Europe's use of the SI metric system.

Some Germans still use Fuß, Zoll and Pfund as we use foot, inch and
pound.

Are
there any other cases where items are sold in imperial units (as
opposed to being an integer number of inches which is translated into
metric *)? If there is 1/2 inch difference in diameter of English and
German 28" wheels, which one is the true diameter that you would
measure? Is one the external diameter of the rim and the other the
diameter of the tyre bead which is slightly smaller and has to be
levered over the rin?

The ISO/ETRTO measurement is the actual millimetre diameter of the
bead/seat, which is the same for the tyre and the rim, although there
are variations in manufacturing tolerances which lead to some tyre/rim
combinations being looser or tighter than normal. The traditional tyre
sizes are based on effective diameter: a fat tyre on a smaller rim has
the same diameter as a skinny tyre on a larger rim, hence you get two
English 26 inch tyre sizes, one with a width of 1-1/4 inch and the
other of 1-3/8, with a corresponding 1/4 inch difference in rim size
which seems pretty reasonable. But there is some strangeness - English
28 inch (28 x 1-1/2 as fitted to vintage "police bikes") is 635mm, a bit
bigger than English 27 inch at 630mm but the German "28 inch" (commonly
called 700C) is 622mm, actually smaller than 27 inch.

Incidentally, has anyone actually had to use tyre levers for fitting
a bicycle tyre? I always find that I just tuck the bead in at one
side, then ease it in by moving my thumbs towards the opposite side
and then pull it away from the rim at the very opposite until it pops
into place; and vice versa for removing. You'd think that a lever
would be needed at least to make the bead pop out from the rim when
removing, but I've never found one necessary. Am I unusual?

Wider tyres on wider rims tend to be easy to fit and remove without
levers, although some cheap tyres can have very thick inflexible beads
that make it harder to get them into the well of the rim, in order to
get that bit of slack to pop the last bit over the edge. Conversely some
wide but very light and flexible tyres (e.g. racing mountain bikes
tyres with Kevlar beads) can be fiddly to fit because they're so floppy
they won't stay on until they're held in shape by the partially
inflated inner tube. Narrower tyre/rim combinations are more likely to
be too tight to fit without levers; I have such a combination on one
of my bikes, and the usual method of strapping the bead into the well
of the rim just doesn't work. That one needs the application of my
workshop-quality steel levers, and it's still not easy. You have to be
very careful not to pinch the inner tube when you're using levers, but
it shouldn't normally be necessary when fitting a tyre - when removing
a tyre it may be quicker and easier to user levers, and if you're going
to bin the tube you don't care about pinching it anyway.

Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was now
far to big to fit the rim....is this normal ?


Hmm, either the bead wire has broken (on both sides) or you have simply
mis-remembered which bike or wheel the tyre came off. My money is on the
latter.

Ive kept many old bike tyres for years and in my experience, the bead
*never* changes in size. Have you had new wheels put on at any time in the
past? What size did the ruined tyre claim to be in the sidewall? What was
the figure printed on the sidewall of the €œstretched€� tyre?

Tim

--
Please don't feed the trolls

"Tim+" wrote in message
...
Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?


Hmm, either the bead wire has broken (on both sides) or you have simply
mis-remembered which bike or wheel the tyre came off. My money is on the
latter.

I've kept many old bike tyres for years and in my experience, the bead
*never* changes in size. Have you had new wheels put on at any time in
the
past? What size did the ruined tyre claim to be in the sidewall? What was
the figure printed on the sidewall of the "stretched" tyre?

Tim

come on it says 28 inch on the tyre ,,,,,,and it IS 28 inch bike ....

On 18/10/2018 13:44, Jim GM4DHJ ... wrote:
"Tim+" wrote in message
...
Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?


Hmm, either the bead wire has broken (on both sides) or you have simply
mis-remembered which bike or wheel the tyre came off. My money is on the
latter.

I've kept many old bike tyres for years and in my experience, the bead
*never* changes in size. Have you had new wheels put on at any time in
the
past? What size did the ruined tyre claim to be in the sidewall? What was
the figure printed on the sidewall of the "stretched" tyre?

Tim

come on it says 28 inch on the tyre ,,,,,,and it IS 28 inch bike ....

But are the rims 28inch?

"Richard" wrote in message
news
On 18/10/2018 13:44, Jim GM4DHJ ... wrote:
"Tim+" wrote in message
...
Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28
inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?


Hmm, either the bead wire has broken (on both sides) or you have simply
mis-remembered which bike or wheel the tyre came off. My money is on
the
latter.

I've kept many old bike tyres for years and in my experience, the bead
*never* changes in size. Have you had new wheels put on at any time in
the
past? What size did the ruined tyre claim to be in the sidewall? What
was
the figure printed on the sidewall of the "stretched" tyre?

Tim

come on it says 28 inch on the tyre ,,,,,,and it IS 28 inch bike ....

But are the rims 28inch?

the rims are 28 inch
the tyre was used... I took it off the bike years ago... I only put it back
on because the one I was using was destroyed... the tyre said 28
inch.....never mind it is in the bin and a new 28 inch fitted......no idea
what happened

"Jim GM4DHJ ..." Wrote in message:

"Richard" wrote in message
news
On 18/10/2018 13:44, Jim GM4DHJ ... wrote:
"Tim+" wrote in message
...
Jim GM4DHJ ... wrote:
After a puncture and a ruined tyre I tried to put back on an old 28
inch
bike tyre that WAS on the bike years ago only to find its diameter was
now
far to big to fit the rim....is this normal ?


Hmm, either the bead wire has broken (on both sides) or you have simply
mis-remembered which bike or wheel the tyre came off. My money is on
the
latter.

I've kept many old bike tyres for years and in my experience, the bead
*never* changes in size. Have you had new wheels put on at any time in
the
past? What size did the ruined tyre claim to be in the sidewall? What
was
the figure printed on the sidewall of the "stretched" tyre?

Tim

come on it says 28 inch on the tyre ,,,,,,and it IS 28 inch bike ....

But are the rims 28inch?

the rims are 28 inch
the tyre was used... I took it off the bike years ago... I only put it back
on because the one I was using was destroyed... the tyre said 28
inch.....never mind it is in the bin and a new 28 inch fitted......no idea
what happened




There are two different '28 inch ' tyre sizes though, those with
a bead diameter of 635mm, otherwise known as 700B and those with
a bead diameter of 622 mm, otherwise known as 700C.

You can also get different '26 inch' tyres as well.

Which is why it's always better to refer to tyre size by their ISO
sizes, as no confusion then
--
Chris French

Yes rubber can be like that. I have a knob on a radio here and the rubber
outer is now so big I have to put tape underneath it to stop it falling off!
Brian

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The Sofa of Brian Gaff...

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Note this Signature is meaningless.!
"Jim GM4DHJ ..." wrote in message
...
After a puncture and a ruined tyre I tried to put back on an old 28 inch
bike tyre that WAS on the bike years ago only to find its diameter was now
far to big to fit the rim....is this normal ?