I've got a Marin Riftzone 2004 (i think) its currently got mavic rims which are 26 X 2.10 I recently have been getting loads of punchers so I thought I buy some 'Schwalbe Marathon Plus ATB 26 x 2.0 ' but they dont fit I thought the .10 of an inch would not make that differance but clearly it does. Am i correct in thinking they are the wrong size now?