[Woolleyfooley]

would a 25t sprocket go ok with a 13t freewheel? (bmx) just wondering if anyone has any experience with this setup or knows if it will work ok. thanks.

 

[scurban]

I use 28-13 with 24" wheels, and it feels just about perfect. I think 25-13 would be a bit to easy for a 26" or 24". On a 20" It would diffinately be way to easy.

 

[CrabJoe StretchPants]

thats a pretty low gearing. usually a 34-36t chainwheel is ideal for a 13t freewheel (i think).

 

[Mr Tiles]

28-13 is money on my dna with 2-6ers...

 

[Stoked]

30/13 feels great riding street and trails for me on 24's

 

[Changleen]

(Number of front chain ring teeth / number of rear cog teeth ) x Wheel size in inches = Standard ratio.

Lower numbers mean easier to pedal.

Most BMXers like around 45-55.

(25/13)*20= 38.4 which is a pretty low gear.

 

[Woolleyfooley]

it would be for a 20 inch tire.. so would 25 front and 13 rear be a bad set up you think?

 

[CrabJoe StretchPants]

it would be for a 20 inch tire.. so would 25 front and 13 rear be a bad set up you think?

?

if it is for a bmx bike, the ratio is really low (as the post above just clearly explained)

 

[scurban]

Unless you plan on useing your bmx bike to climb hills, I think it would be a poor ratio to run.

 

[pnj]

it's great if you want to pedal your balls off and go no where....

don't do it..

 

[Mudpuppy]

Try something around 30 by 13 or 25 by 11 for a more reasonable 20" gearing.

 

[jonKranked]

on my 20" i run 36x13 ratio, which is about the norm you want to aim for, unless you are going for an easier gear (park & ramps) or a harder gear (racing). typically you want to maintain as close to a 2.5~2.7 ratio as possible.

 

[dromond]

36-13, 33-12, 30-11, 25-9 are stanard accepted gear ratios for a bmx. 25-13 would be insanely low.