The calculated distance (air line) between Saint-Genis-Laval and Grenoble is approximately 57 miles respectively 92 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Saint-Genis-Laval and Grenoble has been calculated here.
Air line (approximately)
92 kilometers
50 nautical miles