Go to the Shell Eco-marathon web site and search. You can buy special Michelin low rolling resistance tires for both the Urban concept and the regular prototype classes through Shell.
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About the tires
Michelin Tires
Teams are not required to use Michelin tires and are free to use tires of their choosing. Please ensure that the tires properly fit the wheel. Below are the available options:
Michelin 44-406 Prototype tires (view photo) = $79 USD
The specs for these tires are 44-406 (20" x 1.75"); inflate up to 50PSI
Download the technical specifications of the Michelin conventional tires
Rolling resistance: 2 kg/t (Kilogramme/tonne)
Michelin UrbanConcept tires (view photo) = $235 USD
Download the technical specifications for the Michelin UrbanConcept tires
Rolling resistance: 95/80 R 16: 1.5 kg/t
Michelin Radial 45-75 R16 tires (view photo) = $235 USD
Download the technical specifications for the Michelin Radial tires
Due to limited supply, we are only able to provide a reasonable number of tires to registered Shell Eco-marathon Americas participants.
To order tires, please contact your Relationship Manager or send an email to ecomarathonamericas at shell.com. VISA, MasterCard, AMEX and Discover Card are accepted. You will need to provide the following information: Desired quantity, credit card number, expiration date, security Code, shipping address and billing zip code.
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I've mentored a Eco marathon HS team for 3 years now. These tires are about as good as you are going to find as regular motorcycle tires aren't being marketed for fuel economy gains just yet..
good luck