How it works
This is how our self seeding system works
- The National Trail Seeding initiative has been put in place to accommodate local races and to assist organisers & timing companies with batching.
- No other seeding initiative will be affected in any way by your National Trail Seeding, your National Trail Seeding will be used at races associated with our partners but can also be submitted to other seeding or ranking initiatives
- Any event organiser or timing companies can submit their results to us as well as to other seeding companies if they would like to support the initiative. Email us at info@nationaltrailseeding.co.za for more information.
- Weighting of races will be standard but the seeding index of the winner of each distance at an event will determine the weight of the National Trail Seeding Index
The athletes seeding will be calculated using two methods. The "Rank Time" method calculates the difference between the winners time and the participants time. The "Rank Position" method will use the top 10 finishers to determine the weight of the race and compare it against the particpants position. The lowest of the 2 ranks will be used as the athletes seeding.
National Trail Seeding will use an athletes best 3 rankings to determine his or hers current NTS Index. If an athlete has less than 3 NTS indexes the score will default to the highest value of 100 until 3 events have been completed. In order to compete and stay active on the Top 50 leaderboard an athlete has to do atleast one NTS Event every 3 months of any discipline.
The "Rank Position" calculation takes the five best ranked riders from the top 10 finishers, average their rankings and multiply that by 90 percent to create the quality of the race. Once the Race Quality is determined we need to establish the Points per Place to be distributed. Points per place are determined by taking the average rankings of all finishing riders to get the midpoint. We then take that number, subtract the Race Quality value, multiply it by 2 and then divide that number by the number of finishers, less one. Once we have both the Race Quality and the Points per Place, we can determine Rank Points for all riders. Rank Points are calculated based on the Race Quality value plus a rider’s place minus one multiplied by the points per place for the event. In summary:
- Race Quality Value = (Average of 5 best ranked riders in race’s top 10) x 0.9
- Points per Place = (((Avg. ranking of all finishers) – (Race Quality)) x 2) / (total number of finishers – 1)
- Rank Points = Race Quality + ((rider’s placing – 1) x Points per Place)
This calculation is done for every result in an event that counts for seeding.
The formula is: (your time / adjusted winner’s time – 1) / beta value and then expressed as a percentage.
In order to cater for extreme races, which is in fact a whole different discipline and currently very popular in South Africa, we added an automtic weighing feature which is simple and are used on both calculations. The end result will be divided accordingly by the factor below.
Mountain Biking
| Distance |
Factor |
| < 100km |
1 (Normal) |
| > 100km |
1.5 |
| > 200km |
2 |
| > 300km and 24 Hour Events |
3 |
Trail Running
| Distance |
Factor |
| < 21km |
1 (Normal) |
| > 30km |
1.5 |
| > 42km |
2 |
| > 84km and 24 Hour Events |
3 |
John Doe is an above average mountain biker and mostly competes against himself & in his age category. John likes marathon mountain bike events of approximately 70km.
Jane Doe on the other hand isn't nearly as fast as John but she enjoys extreme events, anything between 200 & 300km+ and likes to see how far she can push herself within the event cut-off times.
John Doe
| The Facts |
|
| Distance |
60km |
| Factor (<100km) |
1 |
| Winners Time |
02:09:00 |
| John's Time |
03:00:00 |
| John's Position |
61 |
| Total Riders |
275 |
| Avg Ranking of field |
49 |
| Avg of Best 5 ranked riders in Top 10 |
14.4 |
| "Time Rank" Calculation |
|
| (((John's Time / Winner’s time) – 1) x 100) / Factor |
|
| (((180/129)-1) x 100) / 1) |
|
| First Result using "Time Rank" |
39.53 |
| "Position Rank" Calculation |
|
| Step 1: Race Quality Value(RQV) = (Average of 5 best ranked riders in race’s top 10) x 0.9 |
|
| RQV = (14.4 x 0.9) |
12.96 |
| Step 2: Points per Place(PPP) = (((Avg. ranking of all finishers) – (Race Quality)) x 2) / (total number of finishers – 1) |
|
| PPP = ((49 - 12.96) x 2) / (275 - 1) |
0.26 |
| Step 3: Position Rank(PR) = Race Quality + ((rider’s placing – 1) x Points per Place) |
|
| PR = 12.96 + ((61 - 1) x 0.26) |
| Second Result using "Position Rank" |
28.00 |
| The result we use indicated in Red below |
|
| "Time Rank" Result |
39.53 |
| "Position Rank" Result |
28.00 |
Jane Doe
| The Facts |
|
| Distance |
225km |
| Factor (>200km) |
2 |
| Winners Time |
10:48:00 |
| Jane's Time |
20:36:00 |
| Janes's Position |
174 |
| Total Riders |
188 |
| Avg Ranking of field |
49 |
| Avg of Best 5 ranked riders in Top 10 |
14.4 |
| "Time Rank" Calculation |
|
| (((Jane's Time / Winner’s time) – 1) x 100) / Factor |
|
| (((1236/648)-1) x 100) / 2 |
|
| First Result using "Time Rank" |
45.37 |
| "Position Rank" Calculation |
|
| Step 1: Race Quality Value(RQV) = (Average of 5 best ranked riders in race’s top 10) x 0.9 |
|
| RQV = (14.4 x 0.9) |
12.96 |
| Step 2: Points per Place(PPP) = (((Avg. ranking of all finishers) – (Race Quality)) x 2) / (total number of finishers – 1) |
|
| PPP = ((49 - 12.96) x 2) / (188 - 1) |
0.26 |
| Step 3: Position Rank(PR) = Race Quality + ((rider’s placing – 1) x Points per Place) |
|
| PR = 12.96 + ((175 - 1) x 0.26) |
| Second Result using "Position Rank" |
40.00 |
| The result we use indicated in Red below |
|
| "Time Rank" Result |
45.73 |
| "Position Rank" Result |
40.00 |