Hi the service we offer is really innovative and convenient for customers and for us, unfortunately the success of the business relies on customers fully understanding what we have on offer. We offer refurbished alloy wheels on a like for like basis which means you have to give us back the same wheels you want from us. Please read the advert.... read it fully and it will explain how our deal works.    you are not buying wheels outright or upgrading your small wheels to bigger ones.