Those CO2 powerlets take 3 or 4 to pump up a tyre. CO2 is
very temp sesitive road condiction/tyre heat will produce
a big pressure diffrants...
I carry a DRC mini foot pump...
they are real small & light ,come with a carry bag with tie straps..

http://www.drcproducts.com/tool/d59-30/index.html

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...