In older coaches, the bicycle mounts are sometimes not set up for modern mountain bikes with 29-inch wheels and wider tires. Due to the limited space available, it is unfortunately not possible to optimise these bicycle spaces. Therefore, try turning the handlebars, removing a wheel, or maybe even let some air out of the tyre or use a bike lock to attach your bicycle to the hook. If none of this helps, contact the on-board staff so that an alternative location on the train can be found if necessary.