BMX gearing - for road / commuting I have a 2010 Haro Pro Race, which I bought for commuting and general tomfoolery.



I commute on it 2 miles a day, and I want to be able to go faster by changing the current single-speed gearing ratio.

It currently has no modifications from the standard gearing:


Crankset: 3-pc Alloy 175mm, Euro Sealed Bearing BB 
Gearing: 39/14


I find that I can go quite fast with this gearing ratio, but when it comes to going down hill it is just too easy and I no longer get any drive.

Can someone suggest a better gear ratio / crankset that is more aimed for top speed, rather than acceleration, yet still allow me to accelerate from a standstill quite quickly?
what spacing is the is the rear hub? I bought an s2c recently to commute on my track bike, two speed internal geared hub with a gain of 38% but it might be over kill for yourself.

Given your setup you have a gearing of about 55inches, if you were to switch out the rear cog to a 12 tooth you would gain 5inches, bring you to around 60 which is considered a fairly spinny ratio on a track bike.

Easiest way is to switch is the back free wheel. However it seems the lowest freewheel available is 13 tooth so you are limited. You could get a new chainring up front which would achieve the same but may need to buy a new chain too.