STEEL Niner Posted May 14, 2009 Posted May 14, 2009 26 inch Wheel 29 30 32 33 34 36 14 53.86 55.71 59.43 61.29 63.14 66.86 15 50.27 52.00 55.47 57.20 58.93 62.40 16 47.13 48.75 52.00 53.63 55.25 58.50 17 44.35 45.88 48.94 50.47 52.00 55.06 18 41.89 43.33 46.22 47.67 49.11 52.00 19 39.68 41.05 43.79 45.16 46.53 49.26 20 37.70 39.00 41.60 42.90 44.20 46.80 21 35.90 37.14 39.62 40.86 42.10 44.57 22 34.27 35.45 37.82 39.00 40.18 42.55 29 inch Wheel 29 30 32 33 34 36 16 52.56 54.38 58.00 59.81 61.63 65.25 17 49.47 51.18 54.59 56.29 58.00 61.41 18 46.72 48.33 51.56 53.17 54.78 58.00 19 44.26 45.79 48.84 50.37 51.89 54.95 20 42.05 43.50 46.40 47.85 49.30 52.20 21 40.05 41.43 44.19 45.57 46.95 49.71 22 38.23 39.55 42.18 43.50 44.82 47.45 23 36.57 37.83 40.35 41.61 42.87 45.39 24 35.04 36.25 38.67 39.88 41.08 43.50 It may not be perfect according to your exact tire sizes etc (and am not sure what was used) but as a comparison it is a good starting point. For exact comparisons to your tires etc use sheldon browns calculator. This is just less cumbersome. And before any one asks:.................................... i dont know what it weighs!
STEEL Niner Posted May 15, 2009 Author Posted May 15, 2009 @GT racing. This is a chart giving you a rough guide to single speed gear ratios. Top row is the amount of teeth on your front chainring, left column is amount of teeth on your rear cog/sprocket. You match them like a distance calculator in map book, where they meet (vert & horiz) is your gear ratio in roll-out inches. Amount of distance your bike travels for one revolution of the crank ( i think) the higher the number the further your bike travels per crank revolution. It comes in handy when you have various chainrings and rear cogs and want to change your SS ratio to bigger or smaller gearing. I also use it to compare ratios with guys on bikes with different wheels ie 26" or 29" so if you and your mate have different wheel sizes and you are heading out on a SS ride you can get the ratios similar if your strengths are similar too of course! Hope this helps!?!?
GTRacing Posted May 17, 2009 Posted May 17, 2009 @GT racing. This is a chart giving you a rough guide to single speed gear ratios. Top row is the amount of teeth on your front chainring' date=' left column is amount of teeth on your rear cog/sprocket. You match them like a distance calculator in map book, where they meet (vert & horiz) is your gear ratio in roll-out inches. Amount of distance your bike travels for one revolution of the crank ( i think) the higher the number the further your bike travels per crank revolution. It comes in handy when you have various chainrings and rear cogs and want to change your SS ratio to bigger or smaller gearing. I also use it to compare ratios with guys on bikes with different wheels ie 26" or 29" so if you and your mate have different wheel sizes and you are heading out on a SS ride you can get the ratios similar if your strengths are similar too of course! Hope this helps!?!?[/quote'] Is that given in inches? Like 17 x 33 gives you a ratio of 50, I think.50 what?
Anfielder Posted May 18, 2009 Posted May 18, 2009 It all goes back to the Ordinary bicycle ( Penny Farthing ).That would be the Diameter of the wheel ( front ) so a gear of 53 chainring with a 12 sprocket on a mondern bike with 27 inch wheels would be 119.25. If that is x pie you travel 374.86 inches per revolution of the crank.So if we did not have the gears of today we would be riding Ordinaries with a wheel dia of 119.25 inches 9 foot 11inches. Now that would make your eyes water, unless you are 20 foot tall. ( 9foot 11inches is about 3metres, before someone asks ) IN Europe they never got round to understanding inches and feet ( far better using a base of 12 ) Hence they say 53 x 12 and have no idea what it all means!!!
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