What is the length of the cranks on the Halfords Carrera Subway 2?

[Apprentice]

The Carrera Subway 2 comes with a Truvativ Isoflow 42/32/22 square taper crankset. Does anyone know if it is the 175mm or 170mm crank length version?
Thanks,
Paul

[xerxes]

It could be either. Most cranksets come in at least those two lengths and manufacturers may fit longer armed cranksets to large frames and shorter armed ones to smaller frames.

Can you view the bike? Most crank arms have the length stamped on the back.

[Apprentice]

Thanks. Can't view it at the moment. The bike is 20" frame.