Mini Pump

Op maandag 10 mei 2021 om 12:57:03 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 01:45:06 -0700 (PDT) schrieb Lou Holtman
:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?
I don't either. My minipump does about 5.5 bar ~ 80 psi. This takes
quite some time and leaves me somewhat exhausted. Tried this recently,
after a similar discussion in the German language bicycling newsgroup.

https://www.mystrobl.de/Plone/radfahren/technik/komponenten/taschen/DSC_3462.jpeg
5.5 bar is enough for me on that bike, for getting home.
--
Wir danken für die Beachtung aller Sicherheitsbestimmungen

I won more than one bet from people stating that they can achieve 7 bars with a minipump. They were allowed as much time they wanted after which I measured the pressure. Most of the times it was 5 bar. Still enough to make it home. I switched to CO2 catridges (carry two cartridges and two tubes) and so far they worked well for me. 7 bar in a few seconds.

Lou

On 5/10/2021 12:45 AM, James wrote:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100
psi" for various brands and models, starting from an empty
tube.



Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and
longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up
to 25mm tyres @ 100psi, and a higher volume Lezyne pump for
my gravel bike that has 42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I
wouldn't want to use the larger diameter & volume gravel
bike pump to reach 100psi, though it might take fewer strokes.


+1

And besides length/area lesser models than yours can have
devastating inefficiency.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On 5/10/2021 3:45 AM, Lou Holtman wrote:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?

Lou


Some yes, most no.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

Am Mon, 10 May 2021 04:26:45 -0700 (PDT) schrieb Lou Holtman
:

Op maandag 10 mei 2021 om 12:57:03 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 01:45:06 -0700 (PDT) schrieb Lou Holtman
:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?
I don't either. My minipump does about 5.5 bar ~ 80 psi. This takes
quite some time and leaves me somewhat exhausted. Tried this recently,
after a similar discussion in the German language bicycling newsgroup.

https://www.mystrobl.de/Plone/radfahren/technik/komponenten/taschen/DSC_3462.jpeg
5.5 bar is enough for me on that bike, for getting home.

I won more than one bet from people stating that they can
achieve 7 bars with a minipump. They were allowed as much
time they wanted after which I measured the pressure. Most
of the times it was 5 bar. Still enough to make it home. I
switched to CO2 catridges (carry two cartridges and two
tubes) and so far they worked well for me. 7 bar in a few
seconds.

Many years ago I got talked into CO2 cartridges, bought three of these
and stowed them in the desk in my office, as a backup. Months later,
working overtime, it had gotten late. So I packed my things and went to
the basement of our office building where I had parked my bicycle.

https://www.mystrobl.de/Plone/radfahren/IMG-2461.JPG/view.html

There I noticed a flat tire. :-( Patching was no problem, I always
carry both a spare tube and a patching set, using the spare tube only in
cases where patching would fail. But where is the pump? At home, of
course. Back at my desk, I found the cartriges, mounted the adapter
necessary für Presta/Sclaverand valves, walked back to my bicycle and
tried to fill the patched tire. The first became empty before I was
able to fasten the adapter strong enough to get some CO2 into the tire
at all. The second cartridge worked, but only to let me notice that
there was a second hole in the tube. So I inspected the mantle of the
rear wheel, again, noticing and removing another piece of glass.

Only with the third cartridge did I get barely enough CO2 into the rear
wheel to be able to ride home, carefully.

Lesson learned: CO2 cartridges are no replacement for a working pump.

--
Wir danken für die Beachtung aller Sicherheitsbestimmungen

Op maandag 10 mei 2021 om 16:22:09 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 04:26:45 -0700 (PDT) schrieb Lou Holtman
:

Op maandag 10 mei 2021 om 12:57:03 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 01:45:06 -0700 (PDT) schrieb Lou Holtman
:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?
I don't either. My minipump does about 5.5 bar ~ 80 psi. This takes
quite some time and leaves me somewhat exhausted. Tried this recently,
after a similar discussion in the German language bicycling newsgroup.

https://www.mystrobl.de/Plone/radfahren/technik/komponenten/taschen/DSC_3462.jpeg
5.5 bar is enough for me on that bike, for getting home.
I won more than one bet from people stating that they can
achieve 7 bars with a minipump. They were allowed as much
time they wanted after which I measured the pressure. Most
of the times it was 5 bar. Still enough to make it home. I
switched to CO2 catridges (carry two cartridges and two
tubes) and so far they worked well for me. 7 bar in a few
seconds.
Many years ago I got talked into CO2 cartridges, bought three of these
and stowed them in the desk in my office, as a backup. Months later,
working overtime, it had gotten late. So I packed my things and went to
the basement of our office building where I had parked my bicycle.

https://www.mystrobl.de/Plone/radfahren/IMG-2461.JPG/view.html

There I noticed a flat tire. :-( Patching was no problem, I always
carry both a spare tube and a patching set, using the spare tube only in
cases where patching would fail. But where is the pump? At home, of
course. Back at my desk, I found the cartriges, mounted the adapter
necessary für Presta/Sclaverand valves, walked back to my bicycle and
tried to fill the patched tire. The first became empty before I was
able to fasten the adapter strong enough to get some CO2 into the tire
at all. The second cartridge worked, but only to let me notice that
there was a second hole in the tube. So I inspected the mantle of the
rear wheel, again, noticing and removing another piece of glass.

Only with the third cartridge did I get barely enough CO2 into the rear
wheel to be able to ride home, carefully.

Lesson learned: CO2 cartridges are no replacement for a working pump.


In my case they are. You have to use the correct inflater and spend one catridge at home to practice. Choose wisely between 12, 16 and 32 gr cartridges. YMMV.

Lou

On Monday, May 10, 2021 at 9:56:26 AM UTC-5, wrote:
Op maandag 10 mei 2021 om 16:22:09 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 04:26:45 -0700 (PDT) schrieb Lou Holtman
:

Op maandag 10 mei 2021 om 12:57:03 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 01:45:06 -0700 (PDT) schrieb Lou Holtman
:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?
I don't either. My minipump does about 5.5 bar ~ 80 psi. This takes
quite some time and leaves me somewhat exhausted. Tried this recently,
after a similar discussion in the German language bicycling newsgroup.

https://www.mystrobl.de/Plone/radfahren/technik/komponenten/taschen/DSC_3462.jpeg
5.5 bar is enough for me on that bike, for getting home.
I won more than one bet from people stating that they can
achieve 7 bars with a minipump. They were allowed as much
time they wanted after which I measured the pressure. Most
of the times it was 5 bar. Still enough to make it home. I
switched to CO2 catridges (carry two cartridges and two
tubes) and so far they worked well for me. 7 bar in a few
seconds.
Many years ago I got talked into CO2 cartridges, bought three of these
and stowed them in the desk in my office, as a backup. Months later,
working overtime, it had gotten late. So I packed my things and went to
the basement of our office building where I had parked my bicycle.

https://www.mystrobl.de/Plone/radfahren/IMG-2461.JPG/view.html

There I noticed a flat tire. :-( Patching was no problem, I always
carry both a spare tube and a patching set, using the spare tube only in
cases where patching would fail. But where is the pump? At home, of
course. Back at my desk, I found the cartriges, mounted the adapter
necessary für Presta/Sclaverand valves, walked back to my bicycle and
tried to fill the patched tire. The first became empty before I was
able to fasten the adapter strong enough to get some CO2 into the tire
at all. The second cartridge worked, but only to let me notice that
there was a second hole in the tube. So I inspected the mantle of the
rear wheel, again, noticing and removing another piece of glass.

Only with the third cartridge did I get barely enough CO2 into the rear
wheel to be able to ride home, carefully.

Lesson learned: CO2 cartridges are no replacement for a working pump.
In my case they are. You have to use the correct inflater and spend one catridge at home to practice. Choose wisely between 12, 16 and 32 gr cartridges. YMMV.

Lou
CO2 can work but I have had a few times they got too cold and I just could not get the tire up correct. Generally they will work but my instinct tells me that a pump has air forever as long as I can pump. I bought a Lezyne Road Drive should be here in a few days. The flexible hose it the good thing and frankly getting to 65 psi is fine but I really would prefer getting the tire to 85 with no struggle. I don't run over a 100 anyhow so that is not a worry.
Deacon mark

On Monday, May 10, 2021 at 7:56:26 AM UTC-7, wrote:
Op maandag 10 mei 2021 om 16:22:09 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 04:26:45 -0700 (PDT) schrieb Lou Holtman
:

Op maandag 10 mei 2021 om 12:57:03 UTC+2 schreef Wolfgang Strobl:
Am Mon, 10 May 2021 01:45:06 -0700 (PDT) schrieb Lou Holtman
:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?
I don't either. My minipump does about 5.5 bar ~ 80 psi. This takes
quite some time and leaves me somewhat exhausted. Tried this recently,
after a similar discussion in the German language bicycling newsgroup.

https://www.mystrobl.de/Plone/radfahren/technik/komponenten/taschen/DSC_3462.jpeg
5.5 bar is enough for me on that bike, for getting home.
I won more than one bet from people stating that they can
achieve 7 bars with a minipump. They were allowed as much
time they wanted after which I measured the pressure. Most
of the times it was 5 bar. Still enough to make it home. I
switched to CO2 catridges (carry two cartridges and two
tubes) and so far they worked well for me. 7 bar in a few
seconds.
Many years ago I got talked into CO2 cartridges, bought three of these
and stowed them in the desk in my office, as a backup. Months later,
working overtime, it had gotten late. So I packed my things and went to
the basement of our office building where I had parked my bicycle.

https://www.mystrobl.de/Plone/radfahren/IMG-2461.JPG/view.html

There I noticed a flat tire. :-( Patching was no problem, I always
carry both a spare tube and a patching set, using the spare tube only in
cases where patching would fail. But where is the pump? At home, of
course. Back at my desk, I found the cartriges, mounted the adapter
necessary für Presta/Sclaverand valves, walked back to my bicycle and
tried to fill the patched tire. The first became empty before I was
able to fasten the adapter strong enough to get some CO2 into the tire
at all. The second cartridge worked, but only to let me notice that
there was a second hole in the tube. So I inspected the mantle of the
rear wheel, again, noticing and removing another piece of glass.

Only with the third cartridge did I get barely enough CO2 into the rear
wheel to be able to ride home, carefully.

Lesson learned: CO2 cartridges are no replacement for a working pump.
In my case they are. You have to use the correct inflater and spend one catridge at home to practice. Choose wisely between 12, 16 and 32 gr cartridges. YMMV.

There is technique involved, and if you're careless, you can blow through cartridges. I still carry a back-up clown pump, at least when riding alone.

-- Jay Beattie.

On 5/10/2021 4:45 AM, Lou Holtman wrote:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?

I think it depends on the starting condition. The off-brand Hurricane HP
Air Scepter pump on my Bike Friday has an internal diameter of just 17mm
or so. Stroke is about 180mm. If a tire was just low instead of flat, I
think I could inflate to 100 psi, although the Friday's tires don't
require that pressure. If a tire were flat, I think I'd run out of
"reps" (the weight lifter's term) before reaching 100 psi.

The Friday used to carry a full sized Zefal frame pump like my other
bikes. 100 psi is no trick with one of those. I switched to this pump
because it could be stored hidden in the Friday's seat mast where it was
secure from theft and contained when the bike was folded.

--
- Frank Krygowski

On 2021-05-10, AMuzi wrote:
On 5/10/2021 3:45 AM, Lou Holtman wrote:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi" for
various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm tyres
@ 100psi, and a higher volume Lezyne pump for my gravel bike that has
42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want to
use the larger diameter & volume gravel bike pump to reach 100psi,
though it might take fewer strokes.

--
JS


100 psi easily achieved with a minipump? I don't believe that. Did you ever checked that?

Lou


Some yes, most no.


I recall the time when on a tour w/ wife she had a flat...her pump (a Zefal)
would not work and nothing I did could get it to go....disassemble, expand
cup, lube w/ whatever we had....nada.

I had to use MY Zefal HPX, convert it over to Schrader and inflate her tube.
Lesson: Don't assume the pump will always work.

After that I tested them w/ thumb over hole occasionally and we put plastic
bags over the heads to keep the rain out.

Never have tried CO2. I was truly shocked when I could not get the pump
functioning again. Never liked the mini's but might be good for an
emergency spare on a long tour.

pH in Aptos

On 10/5/21 6:45 pm, Lou Holtman wrote:
Op maandag 10 mei 2021 om 07:45:24 UTC+2 schreef James:
On 10/5/21 11:50 am, Frank Krygowski wrote:

It might be handy to see a chart of "pump strokes to 100 psi"
for various brands and models, starting from an empty tube.


Don't forget effort (force) to achieve said pressure.

Diameter and length affects volume / stroke.

Diameter also affects force @ pressure.

To minimize force and strokes, opt for smaller diameter and longer
barrel.

However - is it still a "mini pump" with a long barrel?

I've got a Lezyne road drive pump for my road bike with up to 25mm
tyres @ 100psi, and a higher volume Lezyne pump for my gravel bike
that has 42mm tyres @ 50psi.

100psi is easily achievable for the road bike, but I wouldn't want
to use the larger diameter & volume gravel bike pump to reach
100psi, though it might take fewer strokes.


100 psi easily achieved with a minipump? I don't believe that. Did
you ever checked that?


Yes Lou. I tested it years ago, but for you I tried again. To save
time I pumped my front 23mm tyre to 100psi using my Silca floor pump,
then attached my Lezyne Road Drive mini pump and applied another 40
strokes. Then I reconnected my Silca floor pump and checked the
pressure. It was near to 120psi.


--
JS