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San Francisco, CA 94109



Starter Pack
One 115 gram threaded cartridge and Red Zepplin tire inflator.

$29.95   plus shipping/handling


Replacement Pack
Single 115gram cartridge.
$24.95  plus shipping/handling


Four (4) 115 gram cartridges.
$99.50  plus shipping/handling



Team Pack
Ten (10) 115 gram threaded cartridges.

$224.55   plus shipping/handling









Keeps bike tires inflated for over a year


Lasts 100 times longer than CO2


Non-toxic, non-flammable, non-ozone depleting




STAYFILL keeps your bike ready to ride
We've all been there…you're all ready to go out for a bike ride and your tires are too flat to ride on. STAYFILL was made for you. When you fill your tires with STAYFILL, they stay filled. And your bike is ready to go when you are. STAYFILL won't prevent flats from nails or glass you accidentally ride over, but it will keep your tires hard to minimize the possibility.


STAYFILL is a proprietary gas blend that is non-toxic, non-flammable, and non-ozone depleting. We've packaged STAYFILL in the same metal cartridge used for CO2. But STAYFILL is far better than CO2. We invite you to try STAYFILL and see what we mean when we say “Fill It and Forget It.”



STAYFILL makes a good idea better

We'll be the first to admit that those little CO2 cartridges used to fill up tires are a darn good idea. But like all good ideas, they eventually evolve into even better ideas. You probably found out the hard way that CO2 simply just does not stay in your tire very long. In fact, CO2 begins leaking through the tire wall almost immediately after it is filled. We found that most tires filled with CO2 last about 2 weeks before they are down to almost empty.


How about air? Air also leaks through the tire wall, but not as rapidly as CO2. That's why tires filled with air take a bit longer to lose pressure, but they lose pressure all the same. Unfortunately, because air doesn't compress like CO2, you can't put a lot of volume into one of those little metal cartridges.

STAYFILL lasts 100 times longer than C02

We did multiple head-to-head tests with tires filled with STAYFILL, CO2 and air. It wasn’t even close. Now granted, you may find slightly different leak results for tires filled with CO2 or air depending on the tire manufacturer, tire size and model, and whether the tire is of the tube or tubeless variety. One thing you won’t find different is STAYFILL's performance. If you extend the timeline year or more, a tire filled with STAYFILL still retains its original fill pressure.


Mountain bike tire leak rates


Road bike tire leak rates



STAYFILL cannot leak out
Now for the evolution: STAYFILL can’t pass through the wall of the tire. We have tires in our lab that were filled 4 years ago and they still retain the same pressure today as the day they were filled. Because of STAYFILL's large molecular size, it cannot leak out.


CO2 molecules vs. STAYFILL molecules




STAYFILL is a drop in replacement for CO2

We designed STAYFILL so that it could be used with standard CO2 threaded cartridge dispensing valves. We’ve been asked if there is any problem mixing CO2 and STAYFILL together. The only problem is that the CO2 left in the tire will still leak out and this will require some topping off with more STAYFILL.



Tire types and cartridges


Note: These are estimates and actual results may vary with different tire manufacturers, fill method, and temperature. An optimum StayFill fill would include 10 psig of air in addition to StayFill.



STAYFILL Product Line
Our initial package for StayFill was a 25gram cartridge which was the same size as the standard 16gram CO2 cartridge offered for sale. What we found is that customers hated having to use multiple cartridges and to fill bigger tires and the economics were not the best. We heard you and we responded. StayFill is now packaged in a 115 gram cartridge. This larger cartridge provides enough gas to fill two standard 26” mountain bike tires to 40psig and will handle three high pressure road tires.


We have starter pack which includes a dispensing valve. And for you with the dispensing valves, you can buy the cartridges individually or in a four or ten packs.


We have found that this larger size will also give you a partial fill on motorcycle tires and will fill a lot of soccer balls.



STAYFILL has other uses, too

If you're always pumping up basketballs, soccer balls, or footballs, use STAYFILL instead. The hardest part will be remembering where you put that little needle. You can even use STAYFILL for inflatable pool toys and mattresses. Lastly, use STAYFILL on the tires of those baby joggers, which are constantly going flat, and never worry about filling them again. Nothing's more depressing than seeing a baby with a flat tire.



We invite you to try STAYFILL and join the evolution. Besides, there’s nothing wrong with staying harder, longer.







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