Funding Canceled Funding for this project was canceled by the project creator on September 7, 2011.
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FAQ

  • The lumen is designed to be functional until the end of the life of the tire. There is some discovery and engineering that needs to take place to make sure we accomplish this. Changing the durometer of the rubber in the lumen accomplishes this as well as making the lumen out of slightly more exotic compounds than what is usual for a tire.

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  • The PumpTire saves you time, energy and money. You save time by not having to check your air pressure while keeping your hands clean. You save energy with low rolling resistance; underinflated tires have greater rolling resistance and require more energy to pedal. And finally, the PumpTire may actually save you money. Low pressure tires are prone to pinch flats. This risk is minimized by riding at the right pressure.

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  • Yes. The PumpTire works on standard rims. No modifications are required.

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  • The valve that comes with the tire sets the pressure. This may either be a fixed or adjustable pressure valve. For example the City Cruiser comes with a 65 psi fixed pressure valve that will stop pumping once the pressure in the tire reaches 65psi. The City Pro comes with a high performance adjustable valve that allows you to adjust the pressure between 65-95psi.

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  • No, once the tire reaches the set pressure the pumping stops; the valve assembly stops air from being pushed through the tire.

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  • No, the PumpTire is not a run-flat tire. It is mostly prone to the same injury as other typical bicycle tires (nails, glass, sharp rocks, thorns, etc.) Assuming that your tire is flat from disuse rather than a puncture, some PumpTire models can be ridden at zero pressure and will re-inflate.

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  • Yes, but not all models are designed with this capability. Tires suited for general use / casual use have this capability. High performance tires trade off this feature for lower weight and higher performance.

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  • Absolutely. The tire has a small air filter designed to stop water and other particles from entering the tire.

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  • No more than any other tire. In fact, the pumping efficiency increases with weight by collapsing the lumen more thoroughly.

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  • All models can be ordered with either Presta or Schrader valves.

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  • No, buy as many as you want and we’ll make more. We appreciate your support!

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  • The air is intake is actually at the end of the pressure valve. Air is essentially drawn in through the valve stem then pushed from the tire into the tube.

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  • My experience riding the prototypes is that I couldn't feel the lumen unless I was at very low pressures (i.e., less than 15psi) and this was due to the prototype lumen overlapping where it entered and exited the tire. Unlike a solid rubber, raised center tread, the lumen collapses under the contact patch and conforms more with the overall shape/deformation of the tire.

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  • Conceptually the PumpTire inner tube is compatible with sealant. The sealant would have to be injected into the tube before the tube and tire are connected to avoid sealant moving through the pumping mechanism. We haven't tried it yet, but future products should be able to work with sealant with little modification.

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  • The lumen in the production tires will be fairly puncture resistant and we are looking to incorporate Kevlar/aramid-type materials in the lumen. If the lumen is punctured, however, it will most likely lose some or all ability to pump. The pressure in the tire would not be compromised as one way check valves stop air from flowing out of the tire.

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  • Yes, the control valve may need support from one of the spokes. The prototype valve images do not take into account how the valve is mounted on the system. The size of the valve in the pictures is based upon valves modified from industrial applications that we used in our prototypes. We think we can make them significantly lighter, smaller, but they still may need additional support.

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185
Backers
$14,978
pledged of $250,000 goal
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  • Pledge $1 or more
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    30 backers

    Do a good deed everyday - A number of cyclists and non-cyclists said they really wanted to contribute and do not want anything in return. You folks are great and we really appreciate your generocity!

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  • Pledge $45 or more
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    13 backers

    For a $45 pledge you are pre-ordering your very own City Cruiser PumpTire, plus one 65psi fixed pressure control valve and one inner tube. This set will sell for $64.95 retail. Please indicate schrader or presta valve when ordering. Includes shipping within the USA. Add $8 to your pledge for shipping to Canada, $20 for international shipping.

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  • Pledge $75 or more
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    41 backers

    For a $75 pledge you are pre-ordering a set of two City Cruiser PumpTires, plus two 65psi fixed pressure control valves and two matching inner tubes. This set is expected to sell for $129.90 at retail. Please indicate schrader or presta valve when ordering. Includes shipping within the USA. Add $10 to your pledge for shipping to Canada, $35 for international shipping.

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  • Pledge $100 or more
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    84 backers

    For a $100 pledge you are pre-ordering a set of two City Pro high performance PumpTires, plus two high performance 95psi, user-adjustable control valves and two matching inner tubes. This set is expected to sell for $149.90 at retail. The set is equipped with presta valves. Includes shipping within the USA. Add $10 to your pledge for shipping to Canada, $35 for international shipping.

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  • Pledge $650 or more
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    1 backer

    Bike Shop Order (City Cruiser) - Pre-order a case of 20 tires with 65psi fixed pressure control valves and inner tubes, each packaged for resale. It's a great option for innovative store owners that want to be the first in their area to sell PumpTire. In addition, participating store owners' contact information and links to your website will be added to www.pumptire.com. Add $600 to your pledge for each additional case you'd like to order. Please indicate schrader or presta valves. Includes shipping within the USA. Add $65 per case to your pledge for shipping to Canada, add $165 per case for international shipping.

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  • Pledge $850 or more
    You selected

    1 backer

    Bike Shop Order (City Pro) - Pre-order a case of 20 tires with high performance 95psi, adjustable valves and inner tubes, each packaged for resale. It's a great option for innovative store owners that want to be the first in their area to sell PumpTire. In addition, participating store owners' contact information and links to your website will be added to www.pumptire.com. Add $800 to your pledge for each additional case you'd like to order. Includes shipping within the USA. Add $65 per case to your pledge for shipping to Canada, add $165 per case for international shipping.

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Funding period

- (45 days)