Miles,
"I can draw the sprockets but aren't there already ones available, commercially? Track cogs etc."
All of the cassette single speed cogs, that I know of, are for 3/32" chain...too thin, and most have tall, single speed tooth profile, which won't shift well...needs flat top profile...only available up to 22 tooth. Would be better off using regular cassette cogs.
From my copy of Frank Berto's THE DANCING CHAIN, the bible of bicycle drive history:
In the 1890's 1/4" 6 mm chain and sprockets were the standard...heroic efforts to make 2 sprocket derailleurs using these chains.
By the 1910's...3/16" 5 mm chains and sprockets had taken over...2 sprocket derailleurs were in use.
By the 1920's 1/8" 3 mm chains and sprockets with 2, 3, and 4 sprocket systems were in use. Today this is the standard for single speed bicycles. (These bikes had 4 1/2" 114 mm spacing)
In 1936, Brampton introduced the 3/32" chain. This permitted freewheels with 5 sprockets to be used. (120 mm frame spacing)
At this point, the law of diminishing returns set in.
http://www.cyclepublishing.com/cyclingbooks/dc.html
"I can draw the sprockets but aren't there already ones available, commercially? Track cogs etc."
All of the cassette single speed cogs, that I know of, are for 3/32" chain...too thin, and most have tall, single speed tooth profile, which won't shift well...needs flat top profile...only available up to 22 tooth. Would be better off using regular cassette cogs.
From my copy of Frank Berto's THE DANCING CHAIN, the bible of bicycle drive history:
In the 1890's 1/4" 6 mm chain and sprockets were the standard...heroic efforts to make 2 sprocket derailleurs using these chains.
By the 1910's...3/16" 5 mm chains and sprockets had taken over...2 sprocket derailleurs were in use.
By the 1920's 1/8" 3 mm chains and sprockets with 2, 3, and 4 sprocket systems were in use. Today this is the standard for single speed bicycles. (These bikes had 4 1/2" 114 mm spacing)
In 1936, Brampton introduced the 3/32" chain. This permitted freewheels with 5 sprockets to be used. (120 mm frame spacing)
At this point, the law of diminishing returns set in.
http://www.cyclepublishing.com/cyclingbooks/dc.html