Know the transmission speed between PICAXEs with Radio module
I'm pretty sure you are asking about transmission rates not transition rates.

The transmission speed depends on a variety of factors including (but not limited to)


the type of interface between PICAXE and module

it's clock rate or baud rate etc

the radio signalling system used by the radio module
the data encapsulation and protocols used by the module or Picaxe
the amount of local interference/noise in the radio spectrum used

assuming checksums and retransmits are used.