The calculated distance (air line) between Rive-de-Gier and Grenoble is approximately 59 miles respectively 94 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Rive-de-Gier and Grenoble has been calculated here.
Air line (approximately)
94 kilometers
51 nautical miles