Author Topic: Chainring and Freewheel Ratio (Read 1212 times)

BMX1973 · « **on:** September 06, 2016, 12:17 PM »

I know there have been similar threads about this before.

On a 20" BMX most riders use a 44T Chainring with a 16T Freewheel.

My question; what is equivalent to this on a 24" BMX Cruiser?

I will probably be using a 40T Chainring. $:-\$

Thanks in advance.

Jaymz · « **Reply #1 on:** September 06, 2016, 01:00 PM »

41/17 with 175mm cranks
40/17 with 180mm cranks

BMX1973 · « **Reply #2 on:** September 06, 2016, 03:08 PM »

Cool

Is there a chart that I can down load from somewhere? Thanks.

Why is it a different set up to a 20"?

Could you still use a 44T & 16T or would it all be set up wrong. Seen a couple of 24" like this.

Quote from: Jaymz on September 06, 2016, 01:00 PM

41/17 with 175mm cranks
40/17 with 180mm cranks

Jaymz · « **Reply #3 on:** September 06, 2016, 03:17 PM »

Pretty sure theres a thread on the museum with a link to something, failing that try sheldon browns website

rooski · « **Reply #4 on:** September 06, 2016, 07:15 PM »

2.75 is the best ratio for 20" wheels, not sure about 24" bit less I think( 2.3? )

Divide big by small eg 44/16 =2.75 40/15 =2.66

24" wheel is a different ratio as the bigger wheel is harder to turn.

BMX1973 · « **Reply #5 on:** September 06, 2016, 08:57 PM »

Thanks rooski.

Quote from: rooski on September 06, 2016, 07:15 PM

2.75 is the best ratio for 20" wheels, not sure about 24" bit less I think( 2.3? )

Divide big by small eg 44/16 =2.75 40/15 =2.66

24" wheel is a different ratio as the bigger wheel is harder to turn.

Hmoon27 · « **Reply #6 on:** September 06, 2016, 10:04 PM »

There is a table on here somewhere.
44t up front is a bit too big for a cruiser, unless your just pootlin' around. I raced cruiser a few years back , started high up front and ended up riding 39/17👍