Chainsring in the opposite side… Why?

Hi everyone,

Does anyone know, why chainring would in the opposite side?

chainring is put under the left leg if you grind to the right.

Is it related to safety or power transfer?

No, just so you don't damage the chainring if you was to knock it grinding down a handrail or whatever.

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A, ok. It makes sense on BMX. But what about track bike (I've seen on a track bike) ?

That would either be a fgfs (fixed gear free style) set up or they were trying to be cool.
Problem with a left hand drive side is you pedal in the direction to undo the sprocket at the back. Right hand drive side tightens sprocket as you pedal.

As it had TT bars on, i'm guessing, someone was trying to bee cool…
Thank you!

For a better chainline when using a non track crank.

You can overcome the unscrewing sprocket problem by using a bolt-on sprocket type of hub.

Another problem is that the pedals will tend to unscrew themselves when cranks are swapped over.

they do LHD bmx cranks though dont they?

you can get LHD or RHD cranks. i used to have a profile crankset with both.

You can overcome the unscrewing sprocket problem by using a lock ring, and fitting it properly

Main problem is not the sprocket but pedals getting loose due to precession movement. Same mechanical principle applies to bottom brackets and explains why right-hand cup is threaded anti-clockwise.