Using cycle pump on car tyres

"tucker" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
pump which requires a two handed operation to inflate my cycle tyres.
Could I use this pump to inflate my car tyres which have the same
valve type as my bike or does somebody know of any reason why i
should'nt?

Thanks
George

It's possible ... Just takes a long time.

--
Colin N.

Lincolnshire is mostly flat ... But the wind is mostly in your face

In message <[email hidden]>,
tucker <[email hidden]> writes

Quoted message said:

Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
pump which requires a two handed operation to inflate my cycle tyres.
Could I use this pump to inflate my car tyres which have the same
valve type as my bike or does somebody know of any reason why i
should'nt?

Thanks
George

Works for me

Cheers
--
geomannie

"Colin Nelson" <[email hidden]>typed

Quoted message said:

"tucker" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
pump which requires a two handed operation to inflate my cycle tyres.
Could I use this pump to inflate my car tyres which have the same
valve type as my bike or does somebody know of any reason why i
should'nt?

Thanks
George

Quoted message said:

It's possible ... Just takes a long time.

^
VERY

--
Helen D. Vecht: [email hidden]
Edgware.

Helen Deborah Vecht said:

"Colin Nelson" <[email hidden]>typed

Quoted message said:

"tucker" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
pump which requires a two handed operation to inflate my cycle tyres.
Could I use this pump to inflate my car tyres which have the same
valve type as my bike or does somebody know of any reason why i
should'nt?

Quoted message said:

Quoted message said:

Thanks
George

Quoted message said:

It's possible ... Just takes a long time.

^
VERY

--
Helen D. Vecht: [email hidden]
Edgware.

And the tubing gets VERY hot ....

tucker said:

Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
pump which requires a two handed operation to inflate my cycle tyres.
Could I use this pump to inflate my car tyres which have the same
valve type as my bike or does somebody know of any reason why i
should'nt?

None at all. I've just bought an extra pump to keep in the car. Just as
quick as the garage air-hose, the gauge is more accurate, and you can do
it whereever you are. Highly recommended.

--
The bicycle has a soul. If you succeed to love it, it will give you
emotions that you will never forget.
-- Mario Cipollini

Quoted message said:

Quoted message said:

Quoted message said:

"tucker" <[email hidden]> wrote
> Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
> pump which requires a two handed operation to inflate my cycle tyres.
> Could I use this pump to inflate my car tyres which have the same
> valve type as my bike or does somebody know of any reason why i
> should'nt?
It's possible ... Just takes a long time.

Quoted message said:

^
VERY

Hand or foot pumping car tyres from flat takes ages, but an occasional
top-up is quick and easy.

POHB said:

Quoted message said:

Quoted message said:

> "tucker" <[email hidden]> wrote
>> Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
>> pump which requires a two handed operation to inflate my cycle tyres.
>> Could I use this pump to inflate my car tyres which have the same
>> valve type as my bike or does somebody know of any reason why i
>> should'nt?
> It's possible ... Just takes a long time.
^
VERY

Hand or foot pumping car tyres from flat takes ages, but an occasional
top-up is quick and easy.

I have a cheap track pump from argos and it doesn't seem to take any
longer than a foot pump to pump my car tyre from flat.

I think the diameter of the barrel is too big for proper pressures on a
bike.

Also I don't see why you would have heat problems as car tyres are low
pressure 2 bar compared to the 8+ bar on a road bike.

Quoted message said:

I have a cheap track pump from argos and it doesn't seem to take any
longer than a foot pump to pump my car tyre from flat.

Track pumps have fairly large volume, much like a car pump.

Quoted message said:

I think the diameter of the barrel is too big for proper pressures on a
bike.

?? Not sure i understand how you mean?

Quoted message said:

Also I don't see why you would have heat problems as car tyres are low
pressure 2 bar compared to the 8+ bar on a road bike.

Because due to a larger volume having to pass through the hose, the
area remains heated for longer. I dont think it will be a "problem" as
such, but pumping a car tyre to 2bar would produce more heat in total
than pumping a bike tyre to 2 bar.

CoyoteBoy said:

Quoted message said:

I have a cheap track pump from argos and it doesn't seem to take any
longer than a foot pump to pump my car tyre from flat.

Track pumps have fairly large volume, much like a car pump.

Quoted message said:

I think the diameter of the barrel is too big for proper pressures on a
bike.

?? Not sure i understand how you mean?

Large diameter means it is hard to exert enough force on the pump handle
to get a high pressure.

Quoted message said:

Quoted message said:

Also I don't see why you would have heat problems as car tyres are low
pressure 2 bar compared to the 8+ bar on a road bike.

Because due to a larger volume having to pass through the hose, the
area remains heated for longer. I dont think it will be a "problem" as
such, but pumping a car tyre to 2bar would produce more heat in total
than pumping a bike tyre to 2 bar.

I'm not a physicist and don't quite know how to apply the ideal gas law
etc. But wouldn't compressing a gas 8 times produce much higher
temperatures than compressing it 2 times. AIUI the heat was constant but
just compressed into a smaller volume.

I did a quick google but wasn't totally sure how to apply the ideal gas
laws maybe someone knows the answer?.

Nick said:

CoyoteBoy said:

Quoted message said:

I have a cheap track pump from argos and it doesn't seem to take any
longer than a foot pump to pump my car tyre from flat.

Track pumps have fairly large volume, much like a car pump.

Quoted message said:

I think the diameter of the barrel is too big for proper pressures on a
bike.

?? Not sure i understand how you mean?

Large diameter means it is hard to exert enough force on the pump handle
to get a high pressure.

That's a mechanical advantage thing, just lean on it a bit harder :-)

Quoted message said:

Quoted message said:

Quoted message said:

Also I don't see why you would have heat problems as car tyres are low
pressure 2 bar compared to the 8+ bar on a road bike.

Because due to a larger volume having to pass through the hose, the
area remains heated for longer. I dont think it will be a "problem" as
such, but pumping a car tyre to 2bar would produce more heat in total
than pumping a bike tyre to 2 bar.

I'm not a physicist and don't quite know how to apply the ideal gas law
etc. But wouldn't compressing a gas 8 times produce much higher
temperatures than compressing it 2 times. AIUI the heat was constant but
just compressed into a smaller volume.

I did a quick google but wasn't totally sure how to apply the ideal gas
laws maybe someone knows the answer?.

The equation you want is P1V1 over T1 equals P2V2 over T2

P pressure in pascals
V volume in cubic metres
T temperature in kelvin.

http://en.wikipedia.org/wiki/Combined_gas_law
--
Phil Cook looking north over the park to the "Westminster Gasworks"

tucker said:

Hi, I have a good quality (nearly 40 quid) metal floor standing cycle
pump which requires a two handed operation to inflate my cycle tyres.
Could I use this pump to inflate my car tyres which have the same
valve type as my bike or does somebody know of any reason why i
should'nt?

Thanks
George

You don't want to spend all day pumping up your tyres?

--

Nigel

Nick said:

CoyoteBoy said:

Quoted message said:

I have a cheap track pump from argos and it doesn't seem to take any
longer than a foot pump to pump my car tyre from flat.

Track pumps have fairly large volume, much like a car pump.

Quoted message said:

I think the diameter of the barrel is too big for proper pressures
on a bike.

?? Not sure i understand how you mean?

Large diameter means it is hard to exert enough force on the pump
handle to get a high pressure.

But if the barrel is large in diameter *and* long (like my Silca's), then
it's capable of quick inflation *and* high pressure.

The problem with using bicycle pumps with car tyres is that the guage may
not be accurate at low pressure (or at any pressure). So it would be wise
to check with a high-quality separate guage. (This is not so important for
bicycle tyres, IMO).

~PB

Pete Biggs said:

Nick said:

CoyoteBoy said:

> I have a cheap track pump from argos and it doesn't seem to take any
> longer than a foot pump to pump my car tyre from flat.
Track pumps have fairly large volume, much like a car pump.

> I think the diameter of the barrel is too big for proper pressures
> on a bike.
?? Not sure i understand how you mean?

Large diameter means it is hard to exert enough force on the pump
handle to get a high pressure.

But if the barrel is large in diameter *and* long (like my Silca's), then
it's capable of quick inflation *and* high pressure.

Well I don't know about you Pete but for those of us who haven't eaten
all the pies a large diameter does make high pressures problematic.

My pump has a diameter of 3.5cm which means all my weight (11.5 stone)
will only get the tyre up to about 105 psi.

Phil Cook said:

Nick said:

CoyoteBoy said:

> I have a cheap track pump from argos and it doesn't seem to take any
> longer than a foot pump to pump my car tyre from flat.
Track pumps have fairly large volume, much like a car pump.

> I think the diameter of the barrel is too big for proper pressures on a
> bike.
?? Not sure i understand how you mean?

Large diameter means it is hard to exert enough force on the pump handle
to get a high pressure.

That's a mechanical advantage thing, just lean on it a bit harder :-)

Quoted message said:

Quoted message said:

> Also I don't see why you would have heat problems as car tyres are low
> pressure 2 bar compared to the 8+ bar on a road bike.
Because due to a larger volume having to pass through the hose, the
area remains heated for longer. I dont think it will be a "problem" as
such, but pumping a car tyre to 2bar would produce more heat in total
than pumping a bike tyre to 2 bar.

I'm not a physicist and don't quite know how to apply the ideal gas law
etc. But wouldn't compressing a gas 8 times produce much higher
temperatures than compressing it 2 times. AIUI the heat was constant but
just compressed into a smaller volume.

I did a quick google but wasn't totally sure how to apply the ideal gas
laws maybe someone knows the answer?.

The equation you want is P1V1 over T1 equals P2V2 over T2

P pressure in pascals
V volume in cubic metres
T temperature in kelvin.

Actually this doesn't really help as we don't know V2 in comparison to V1.

Nick said:

Quoted message said:

Quoted message said:

Large diameter means it is hard to exert enough force on the pump
handle to get a high pressure.

But if the barrel is large in diameter *and* long (like my Silca's),
then it's capable of quick inflation *and* high pressure.

Well I don't know about you Pete but for those of us who haven't eaten
all the pies a large diameter does make high pressures problematic.

My pump has a diameter of 3.5cm which means all my weight (11.5 stone)
will only get the tyre up to about 105 psi.

Pardon me asking this in public, but how *long* is your pump?

The point is that if a pump is both large in diameter AND long, then it's
capable of both pumping a bike tyre to high pressure AND pumping up a car
tyre reasonably quickly.

Silca Pista barrel is 32mm (externally), 62cm long, 150 psi no problem for
11.5 stone.

~PB

Pete Biggs said:

Nick said:

Quoted message said:

> Large diameter means it is hard to exert enough force on the pump
> handle to get a high pressure.
But if the barrel is large in diameter *and* long (like my Silca's),
then it's capable of quick inflation *and* high pressure.

Well I don't know about you Pete but for those of us who haven't eaten
all the pies a large diameter does make high pressures problematic.

My pump has a diameter of 3.5cm which means all my weight (11.5 stone)
will only get the tyre up to about 105 psi.

Pardon me asking this in public, but how *long* is your pump?

I firmly believe that the length doesn't matter with regard to pressure.
I'm told that my 46cm is perfectly adequate.

Could you propose a theory as to why length makes a difference?

Quoted message said:

The point is that if a pump is both large in diameter AND long, then it's
capable of both pumping a bike tyre to high pressure AND pumping up a car
tyre reasonably quickly.

Silca Pista barrel is 32mm (externally), 62cm long, 150 psi no problem for
11.5 stone.

Assuming an internal diameter of 30mm 11.5 stone dead weight down force
compares to about 147 psi. I dare say the with a bit of added
acceleration your entire body weight would be enough to get to 150 psi.

Quoted message said:

~PB

Nick said:

I firmly believe that the length doesn't matter with regard to
pressure. I'm told that my 46cm is perfectly adequate.

Could you propose a theory as to why length makes a difference?

The longer (or narrower) the barrel, the more the air is compressed.

Short pumps have to be narrow to get high pressure. Fat pumps have to be
long.

Quoted message said:

Quoted message said:

The point is that if a pump is both large in diameter AND long, then
it's capable of both pumping a bike tyre to high pressure AND
pumping up a car tyre reasonably quickly.

Silca Pista barrel is 32mm (externally), 62cm long, 150 psi no
problem for 11.5 stone.

Assuming an internal diameter of 30mm 11.5 stone dead weight down
force compares to about 147 psi. I dare say the with a bit of added
acceleration your entire body weight would be enough to get to 150
psi.

I mean it's not difficult to inflate a 700x23 tyre to 150 psi with this pump
for an 11.5 stone man (with modest muscles).

~PB

In article <[email hidden]>, Pete Biggs
[email hidden] says...

Quoted message said:

Nick said:

I firmly believe that the length doesn't matter with regard to
pressure. I'm told that my 46cm is perfectly adequate.

Could you propose a theory as to why length makes a difference?

The longer (or narrower) the barrel, the more the air is compressed.

Short pumps have to be narrow to get high pressure. Fat pumps have to be
long.

You are confused. Do you want to go away and think about it, or shall I
try to explain it to you?

Rob Morley said:

In article <[email hidden]>, Pete Biggs
[email hidden] says...

Quoted message said:

Nick said:

I firmly believe that the length doesn't matter with regard to
pressure. I'm told that my 46cm is perfectly adequate.

Could you propose a theory as to why length makes a difference?

The longer (or narrower) the barrel, the more the air is compressed.

Short pumps have to be narrow to get high pressure. Fat pumps have
to be long.

You are confused. Do you want to go away and think about it, or
shall I try to explain it to you?

Feel free to correct me if I'm wrong -- any time -- 3.30 am if you like!

~PB