Hi Guys, I am new to the road bike scene and needing some advice. My rear tyre looks like it's had it. It didnt look like this 2 days ago. I only noticed it tonight when I stopped to refuel. Can anyone explain why/how this happens? Also, needing recommendations on what tyre to get next. My bike is a 2009 Triumph Street Triple R. Rear tyre size is 180/55 ZR 17. I do 120km a day and all fwy.