I'm not sure how this could be done -- maybe a small liquid ring pump -- but the bike pump needs to be in the hub with a 1 mm diameter line connected to the valve stem.
There should be no rolling resistance from the pump as long as the tire is properly inflated but once the pressure drops the hub pump kicks on and slowly brings the pressure back up. Once the tire is properly inflated the pump disables and no longer saps power from the wheel.
A manual over ride would allow the pump to be turned on only at certain times, i. e., during braking or going downhill.
This wouldn't work if you hit a mesquite or palm thorn -- the pump needs to be small and light and will have a low volumetric flow rate -- but it should eliminate 80% of the other flats which tend to be slow leaks.
This wouldn't work if you hit a mesquite or palm thorn -- the pump needs to be small and light and will have a low volumetric flow rate -- but it should eliminate 80% of the other flats which tend to be slow leaks.
You must get a lot of slow leaks. The majority of my flats result in fairly rapid air loss- within a few minutes if not almost immediately.
I'm not sure how this could be done -- maybe a small liquid ring pump -- but the bike pump needs to be in the hub with a 1 mm diameter line connected to the valve stem.
I'm not sure how this could be done -- maybe a small liquid ring pump -- but the bike pump needs to be in the hub with a 1 mm diameter line connected to the valve stem.
This wouldn't work if you hit a mesquite or palm thorn -- the pump needs to be small and light and will have a low volumetric flow rate -- but it should eliminate 80% of the other flats which tend to be slow leaks.
You must get a lot of slow leaks. The majority of my flats result in fairly rapid air loss- within a few minutes if not almost immediately.
The goal is to make cycling more people friendly. It's for the people who buy a bicycle, get a flat and park it in the garage and the bad experience discourages them from ever riding again.
The people here might not be representative of the larger population.
"Bret Cahill" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
You must get a lot of slow leaks. The majority of my flats result in fairly rapid air loss- within a few minutes if not almost immediately.
The goal is to make cycling more people friendly. It's for the people who buy a bicycle, get a flat and park it in the garage and the bad experience discourages them from ever riding again.
If people get discouraged from a flat they should not take up bicycling. If you get a flat it has to be repaired. Topping of a flat doesn't work. A slow leak is rare.
The people here might not be representative of the larger population.
So the larger population is too lazy to use a floor pump once in a while?
This wouldn't work if you hit a mesquite or palm thorn -- the pump needs to be small and light and will have a low volumetric flow rate -- but it should eliminate 80% of the other flats which tend to be slow leaks.
You must get a lot of slow leaks. �The majority of my flats result in fairly rapid air loss- within a few minutes if not almost immediately.
The goal is to make cycling more people friendly. It's for the people who buy a bicycle, get a flat and park it in the garage and the bad experience discourages them from ever riding again.
The people here might not be representative of the larger population.
Some of us do get larger in winter though
-- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971
I have a picture of a "Skinner Automatic Pump" exactly as described. It's dated 1900.
Most bikes don't need more than a few psi to get home. A few cheap small diaphram pumps on a large flange could be powered by rollers on the forks or chain stays.
A cable could disengage it completely so there's no rolling resistance.
This wouldn't work if you hit a mesquite or palm thorn -- the pump needs to be small and light and will have a low volumetric flow rate -- but it should eliminate 80% of the other flats which tend to be slow leaks.
You must get a lot of slow leaks. he majority of my flats result in fairly rapid air loss- within a few minutes if not almost immediately.
The goal is to make cycling more people friendly. It's for the people who buy a bicycle, get a flat and park it in the garage and the bad experience discourages them from ever riding again.
I suspect some sort of airless tire is a better solution for those folks - they won't mind the performance hit, and won't have to worry about (what has to be...) a finicky hub-mounted air pump and connections.
I've been thinking about the "auto-pump concept", and don't think it's likely to ever be viable in this day and age. Think about it - suddenly if you crash due to a flat, you can blame over-pressure from the hub-mounted pump (and sue the manufacturer). If you design the pump so that the maximum pressure is appropriate for the tire, then as it wears, that pressure will decrease (and the tires will get progressively softer). Seems like a non-starter (though it is a cool nerdy must-have if it really existed). ;-)
Quoted message said:
The people here might not be representative of the larger population.
