Wednesday, May 24, 2006

Double Drive



This guy from Germany is riding from Argentina to Montreal on a double drive fixie.

2 Comments:

Blogger Longshanks said...

Wow, that's insane! What's even more insane: I, in all my assistant-TO-expert ("The Office" anyone?) bike knowledge, have never heard of a double drive fixie. Preposterous! Right, honey?

11:26 AM  
Blogger Rob said...

Yes, it's not really a good idea.

To make it work as this guy has, you have to have exactly the same gear ration on both sides. I guess you get a slight advantage in power because power from you left stroke doesn't have to travel through the bootom bracket to the right side before it's utilized to move the bike. Instead, it's going directly through the left arm to the chainring, etc. But, now you've added the weight of a second drive train...

I've heard the hypothesis that you could run a freewheel on both sides of the hub - the left side having an easier gear than the right. Thus, you could pedal forward on the higher gear and skid on the lower - the idea being that the left side freewheels when the right side is engaged (the left freewheel is backwards).

Nice idea, but the chain will bind with this configuration because the left side will want to move faster than the right.

I guess technically you could put the higher gear on the left and it would work, but it defeats the purpose. Now you're skidding on the higher gear. I feel like this may have problems at certain rpms anyway.

5:09 PM  

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