Will the rear wheel off a 3TJ fit a 1WG? If not is there any of the models with a 17 inch rim that would, want a better selection of tyres for my bike. 18 inch is rare and limited to bridgestone tyres and some other odd ones.

It's really not worth all the agro and expense for a road bike, the wider tyre and smaller radius screws up the handling so you'll end up needing to change the front too .....

Save your money and buy some of the bridgestones or maybe Dunlop Alpha 10's

Sort your suspension out and concentrate on being smooth through corners, you'll be quicker as a result