Tooth Chainring
 MOUNTAIN BIKE CHAINRING 20 TOOTH 64 BCD STAINLESS US $19.95 
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 Raleigh Cottered Crankset 165mm Chainring 42 50 Tooth US $11.50
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 Dura Ace FC 7803 39 Tooth 10 Speed Triple Chainring US $155.99
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 Ultegra FC 6650G 50 Tooth 10 Speed Compact Chainring US $158.99
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 Ultegra FC 6500 52 Tooth 9 Speed B type Chainring US $70.99
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 Ultegra FC 6603 52 Tooth 10 Speed Triple Chainring US $87.99
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 TruVativ Aluminum 30 tooth Chainring 74mm 5 Bolt Chain Ring 30t Tru Vativ US $5.99
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 Sugino S Cubic 50 tooth chainring US $20.00
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 Ultegra FC 6500 53 Tooth 9 Speed A type Chainring US $69.99
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 MOUNTAIN BIKE CHAINRING 21 TOOTH 64 BCD STAINLESS US $19.95
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 NEW Ultegra Grey 6700 Chainring 53 tooth FC 6700 B Type US $80.00
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 39 Tooth Road Chainring 130 BCD US $.99
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 Ultegra FC 6603 30 Tooth 10 Speed Triple Chainring US $38.99
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 Ultegra FC 6604G 39 Tooth 10 Speed Triple Chainring US $48.99
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 Shimano XT FC M751 752 LX FC M571 32 Tooth 9 Speed Chainring US $38.99
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 Ultegra FC 6604G 30 Tooth 10 Speed Triple Chainring US $40.99
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 Ultegra FC 6503 30 Tooth 9 Speed Triple Chainring US $34.99
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 Ultegra FC 6650G 34 Tooth 10 Speed Compact Chainring US $38.99
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 Ultegra FC 6600 53 Tooth 10 Speed Chainring US $95.98
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how different is a 17t cog from an 18t cog?
I just got a new rear wheel and am wondering whether to keep my 18t cog or look into a cog with a different tooth count. I'm mostly curious in knowing how different it'll feel to ride say a 16t or 17t cog, compared to my current cog. Would that increase my speed? Does it make it more or less difficult to pedal uphill? There are some parts of my commute where I'm pedaling fast but not really gaining ground/speed, it's like I might as well stop pedaling to spare myself some energy and let gravity/momentum do the work - what sort of an effect would a 17t cog have in this case?
any other comparisons between different cog sizes is appreciated!
things to note:
I ride a single-speed road bike, freewheel not fixie, with 700c wheels and a 42t chainring
It's all about ratio from the sprocket up front and the cog on your rear but since your focusing on the rear. If you go lower on teeth like if you go to a 16t, you'll get more speed but pedaling will become a bit harder when going uphill. Lesser the tooth, the harder to pedal but more speed. You probably won't see a big change on the effort you have to put to pedal if you go 2 tooth lower.
I saw i change when I went from 18T to 11T but 2T lower for you should be a good upgrade.
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