The calculated distance (air line) between Bochum-Hordel and Roubaix is approximately 182 miles respectively 293 kilometers.
By car or train, the actual journey to Roubaix is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Roubaix has been calculated here.
Air line (approximately)
293 kilometers
158 nautical miles