Tyreshopper now has a price comparison tool. Your customers can enter the basics of the tyres they require using a widget on your site and search easily without leaving the page.
Here is an example: http://www.awin1.com/cawshow.php?v=3478&s=452379&q=217895&r=45628&iframe=1
You can find the widget available in the network. Please contact me at email@example.com if you have any more questions.