When using a Thule bike rack, it's important to drive safely and adhere to all traffic regulations, including speed limits. However, as a general guideline, you should ensure that you do not exceed a speed of 130 km/h (approximately 80 mph) with the bike rack attached to your vehicle. This recommendation is in place to ensure the safety and security of both the bikes and the rack, as well as other road users. Always remember that conditions such as wind, road surface, and vehicle load can affect driving dynamics, so it's crucial to adjust your speed accordingly to maintain safety. You should always refer to the Thule owner's manual for additional information and updates.