THe FW05S is the standard sports moder which comes with a GS15R pull start motor.
Unlike the V-one range, the FW05S can be fully upgraded in to the R model.
Main differences:
Radio Box.
Diff internal gears (2 in S, 4 in R)
central drive shafts (alloy on R)
Top Deck (Plastic on S)
That's about all i think
Oops nearly forgot:
Shocks, plastic on S, Threaded Alloy on R.