Board Thread:Game Discussion/@comment-27192151-20160629105239

If you tap 'race' to redo a time trial you won't get any gold for re-completing the series, as it stays at 100%. BUT, if you tap 'race', then cloud save and close the game, upon reopening, the series with the TT in will have dropped down from 100%, and you will get a small GC reward for completing it again. You can do this multiple times in each series.

 