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@hippy
cog = rear
sprocket or chainring = front
Now that we've cleared that up..
http://weightweenies.starbike.com/forum/viewtopic.php?t=53514&view=previous
"The biggest 64 BCD chainring specialites-ta makes is a 30T"
http://www.socaltrailriders.org/forum/workshop/17792-30t-chainring.html
Middleburn appear to do 'em..
http://www.mtbtandems.com/Middleburn.html