Am I missing something, I followed the link and the combo seems to be 15 dollars more than if you buy them seperate. I am curious because I have a base 2005 Rockhopper and I use it to pull my kid in his Burley Solo 2-3 times a week and between him, the Burley and my 225lbs, stopping power is, well, sometimes more like slowing power if you know what I mean.