Gear Ratio

[Mr Nice]

Could someone please explainn gear ratio to me? dont know what 16t freewhelel 42 chainrnring v 18t freeewheel 39 chainring means whats the differance/advantage of one other the other? whats the best ratio?
thanks in advance

[bof]

try this on the bmxultra site the higher the number the harder it is to pedal 44/16 is the average bmx gearing
http://www.bmxultra.com/downloads/flash/gearchart.htm

[Dark Diggler]

Front cog Teeth no. divided by the rear cog Teeth no. multiply by the wheel size (so a good equation for any wheel size  ) I.E 44/16x20 =55 this is the number you aim for generally. Less is easier more is harder. Baddabing

[Mr Nice]

Cheeers!

[(((sonic)))]

Depends on your style of riding, track you are racing, conditions etc....i still ride with a 46/16 and love it, suits me

[Mr Nice]

Depends on your style of riding, track you are racing, conditions etc....i still ride with a 46/16 and love it, suits me
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Talking os race bike. so does 46/16 give good top end of good acceleration(wifes spelling)?

[meticulous]

46/16 is for top end, you need powerful legs to get going, great for long tracks...

[moley]

I tried 47/16 at Bradford last summer!!

And I've tried 44/16 too!!

I'm shit with both!!   

[wirewheel]

45 16 with 180 cranks

[Mr Nice]

Cheers everyone

[DoubleD]

40/17  24 x1.75 whit  180 profiles