There was a place renting Scott’s on the main road out of the centre (Route de la Plagne).
Actually, it might have been a GT… 😳
Probably from here: http://www.bikehiremorzine.com/road.html
Had big banners outside it IIRC (but bearing in mind ny last recollection, that might have been somewhere completely different…)
Make sure it has a compact chainset though.
If you are planning on doing the Joux Plane circuit I’d recommend you do it from Samoens as apart from the good warm up its better to ascend that direction than descend (road surface wise).
Avoriaz is good to and La Ramaz I also enjoyed..