Actually, the fender straps for the Kuat Piston Pro were only good for up to 45 inch wheel base (the XL is close to 48 inches) - I called and talked to them and they essentially told me I shouldn’t use this rack with the bike either (the salesmen at an independent rack place told me it would work, and suggested the fender strap - bike fit, but it was awkward without the fender strap). So… back to 1Up who was called out in this thread earlier - I called and discussed with them, and they said with their fender attachments, they said I’d be fine (and they pulled up the bike on the Specialized website to look). I’ve ordered one of the Super Duty ones (required for the Vado weight), including the fender cushions and some other accessories… hopefully this will be the final and best for fit.