ShwaMalleoMK's video overview of the timer oddity:
Below is a list of possible splits on the 6 tracks affected. By looking at the splits on mkwrs.com's track pages you'll eventually find out how the game deals with rounding; I will not detail it here.
Section 1: (* = MK7 Rainbow Road only)Section 2:Also applies to section 3 of
MK8 Mount Wario &
MK8 Big Blue.
(* = MK7 Rainbow Road only)(w = MK7 Maka Wuhu & MK7 Wuhu Loop only)(
^ =
NOT possible on MK7 Maka Wuhu & MK7 Wuhu Loop)
- 99w/00/01*
- 16/17
- 33/34^
- 49w/50/51*
- 66/67
- 83/84^
Total time: The timer oddity applies to the total time only on point-to-point tracks i.e. tracks that aren't loops (MK8 Mount Wario & MK8 Big Blue).MK7 Maka Wuhu loops back to the beginning but the starting and finish lines are separate. For some reason, timer oddity doesn't apply to it.
Table summary:

Table summary by track type:

This information was compiled using data from Cole's MK7/MK8 WR history website as well as the videos below. If you have proof of a split that I believe to be impossible, please let me know.
- mkwrs.com:
MK7 Wuhu Loop,
MK7 Maka Wuhu,
MK7 Rainbow Road,
MK8 N64 Rainbow Road,
MK8 Mount Wario,
MK8 Big Blue-
MK7 Rainbow Road: section 2 .X01 (following a section 1 .X49 or .X99) possible as seen on gogoku7's video-
MK7 Rainbow Road: section 2 .X16 (following a section 1 .X00 or .X50) youtube.com/watch?v=4NQLdrJmgp8-
MK8 N64 Rainbow Road: section 2 .X16 (following a section 1 .X00 or .X50) youtube.com/watch?v=KSuQIghiykMTimer oddity seems to be linked to track sections physically, i.e. they're not caused by specific section
numbers. For example, on
this video the player manages to make Mario Kart 8 believe he starts the second section of the run when in reality he physically enters N64 Rainbow Road's section 3. The game displays a section 2 time that is impossible to get physically on section 2 (
.828).