Polar Bike

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Permalink Reply by Kim on January 5, 2012 at 16:03

I see the reasoning behind the small, fat wheels and so on, but those dérailleur gears look like they're asking for trouble...

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Permalink Reply by Ken Davidson on January 5, 2012 at 16:54

I think gearhubs experience problems with low temperatures, since they rely on close tolerances internally - the casings etc. contract, and the lubricant gets thicker.

I'm a fan of enclosed gears but in this case the lesser of two evils to use 'open' gears.

They could possibly do with the extra few percentage points of efficiency too, considering how much those tyres will drag. ;)

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Permalink Reply by rOcKeTdOg on January 5, 2012 at 18:10

Actually the hannebrink bike was designed for the californian desert she'd be much better off using a proper fat bike like those used for the iditorod

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