User blog comment:BIA-Kaboose/Proposed Ryze Rework/@comment-24170465-20140121012859/@comment-8267817-20140123032239

You could still get them for MR, but Ryze is built around mobility, nearly forcing him to buy Merc treads was kind of annoying, by adding it as a part of his kit he can have some variety, if you still want the MR then you can get the Merc treads, and the tenacit will stack some, but it is multiplicative, and the soft cap has a fairly low starting point.