This has been talked about many times...tread direction makes absolutely no different on Conti tires. Their engineers put an arrow on them because people that overthink their lives want to see an arrow.
Thanks!!! Yep, I figured they put the arrow on for some reason, Have a great day.. LOLIt obviously makes no functional difference which direction this tire is mounted. However, the design on the sides is directional, so those who are anal about aesthetics will want to pay attention to this.