at a bike shop i used to work at, we charged a seperate price for fitting marathons for this very reason.................
Only advice i can give is use tow straps, 2 or 3 of em to keep the pressure on, and fairly liquid on the rim tape to help the seated side slide over. Otherwise, get a mate to help, by both pushing dow the sides of the tyre in opposite directions until the last bit not on is at the bottom. you can sort of stretch the tyre a small amount this way to get it on.
Last resort, a small amount of fairly liquid in a spray bottle of water to spray on the rim. Then use a rim block to clean the breaking surface when you're done, assuming you're using rim brakes.
at a bike shop i used to work at, we charged a seperate price for fitting marathons for this very reason.................
Only advice i can give is use tow straps, 2 or 3 of em to keep the pressure on, and fairly liquid on the rim tape to help the seated side slide over. Otherwise, get a mate to help, by both pushing dow the sides of the tyre in opposite directions until the last bit not on is at the bottom. you can sort of stretch the tyre a small amount this way to get it on.
Last resort, a small amount of fairly liquid in a spray bottle of water to spray on the rim. Then use a rim block to clean the breaking surface when you're done, assuming you're using rim brakes.