The standard TD4.2 slider supports tires up 700x55mm (leaving some room for mud, etc). For even more tire / mud clearance, the new Laid Back slider moves the rear wheel 1cm back, opening up clearance for more tire / mud clearance – up to 700x60mm. If you plan on rolling on large tires, this slider is highly recommended. This slider gives TD4 an identical chainstay length to Flaanimal 6.0 Titanium and 6.0 Steel.