can anyone explain what a 40 series tire means as have just bought a pair

thanks

a 40 series tyre, is a tyre size that fits on a 40 series rim, looks like you have either just got yourself a useless set of tyres or cost yourself a new set of rims.

nope torque shreded the rims and got them with it in the order. so how do the measurements work

Generally tires are rated in series 70, 60, 50, 40- this means that the sidewall is 40% of the treads width. tread width 2" sidewall just under 1/2"

so sizing of model tires is pretty much the same as full scale?