Bias ply on rear and radial on front is dangerous. You can however safely run a radial on rear but a bias ply on front. This is because the slew is much greater on a bias play tire than a radial.
With decent sport tour tires, especially where you are paying for installation, do not install the cheapest tires you can find. Better quality tires will perform better and last much longer, reducing your cost in the long run.
For budget tires look to the Dunlop Roadsmart 3 or perhaps the Bridgestone T30. If you go cheaper than these you will be asking for issues.
Height adjust is via lowering kit or lower seat, not tires.
Last edited by twowheels; 06-18-2017 at 01:38 PM.