(Trent Nelson | The Salt Lake Tribune) A mountain biker rides the 19th Ave trail in the Salt Lake City foothills on Friday, Sept. 17, 2021.(Trent Nelson | The Salt Lake Tribune) A mountain biker rides the Meadow trail in the Salt Lake City foothills on Friday, Sept. 17, 2021.(Trent Nelson | The Salt Lake Tribune) A mountain biker rides the 19th Ave trail in the Salt Lake City foothills on Friday, Sept. 17, 2021.(Trent Nelson | The Salt Lake Tribune) A mountain biker rides the 19th Ave trail in the Salt Lake City foothills on Friday, Sept. 17, 2021.(Trent Nelson | The Salt Lake Tribune) A mountain biker rides the 19th Ave trail in the Salt Lake City foothills on Friday, Sept. 17, 2021.(Trent Nelson | The Salt Lake Tribune) A mountain biker rides the Meadow trail in the Salt Lake City foothills on Friday, Sept. 17, 2021.