Hello Fedoizoi12
Travelling on a Supersaver ticket when arriving by air is a very bad idea, what if your flight is late? Your ticket will be lost if you can’t meet the departure time as given on the ticket. You need to purchase a new ticket in this case.
Bicycles in boxes / cases need a bicycle ticket and will only be transported if there is enough space for them and they do not block aisles, emergency exit doors, or emergency equipment.
Solely bikes in Tranzbags are free of charge.
On the small trains from Martigny to Le Châble the bicycle transport is very limited, especially on days with good weather.
https://www.regionalps.ch/train-valais/supplement-velo-2024.html
Kind regards,
Roland