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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
How to read a Roll/JART Chart, and what’s really g
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[QUOTE="Timr, post: 183427, member: 16236"] Part II Ok, so we completed the first section of the race. What come next? A reset. What is a reset? A reset is a point on the course where you advance the mileage on your odometer. What this does is create a situation where you have to wait for time to catch up. The reset advances the mileage from 7.7 to 11.0 at 18mph. This results in a reset that will last for 11 minutes. So, if you ride into the reset 5 minutes late, then you have 6 minutes to hang out before you leave on time. If you arrived at this reset 15 minutes late, then you would want to continue riding and not stop because you would still be late. You would however, go from being 15 minutes behind to only 4 minutes behind. Tip: It’s a good idea to calculate how long the reset will be in minutes and write that on the roll chart. That way, when you hit a check before a reset, you’ll know if you can ride slowly into the reset or if you need to keep on riding hard at your fast pace. The check workers will say: “There’s a reset ahead.” And that’s great that there is, but if you are farther behind than the length of the reset, you don’t want to waste more time by slowly riding into the reset, shutting off your bike, only to realize that you are still late, and you need to go! This next section creates a number of possible scenarios. There’s a possible at 11.1 which is only 1/10th of mile beyond the reset. Then, after the first possible, the speed average drops way down to 12 mph. There’s 10 possibles at 12mph before the speed jumps up to 24 mph. This section is 9.7 miles long and should take 29 minutes to complete if you ride it perfectly on time. Scenario #1: There could be a check at the very first possible followed by another check at one of the last couple of possibles before the next reset. If this was the case, then obviously the club would be trying to catch people leaving the reset early by putting the check at the first available possible. If there was a check at that location then what would you do as a rider? Well, first you would hope that you didn’t leave the reset early so you don’t burn it. Then, remember that there can’t be another check until 3 miles after that check. Now, if there is only 2 checks in this section, and the first one is at the first possible, 11.1, and the second is at one of the end possibles making this a long test section then why would the club use a 12 mph average for part of the distance? Two possible answers: 1. The first part of the trail uses dirt or jeep roads with bad rain wash outs, and they don’t want people really pushing the pace through there because of safety. Or, 2, there’s something else going on here. If the check was placed at 11.1, the next possible location for a check would be at 13.2. This would be a very tricky location for a 3rd check in this section. More still to come... [/QUOTE]
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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
How to read a Roll/JART Chart, and what’s really g
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