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Hotfoot

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Everything posted by Hotfoot

  1. Welcome to the forum!
  2. Glad to hear that, I look forward to seeing you there! I had fun riding with you in Vegas.
  3. FWIW, I don't try to see the tank in my peripheral vision ( I probably can on the BMW, but not on my little bike), but my outside arm is on it so I have a very good sense of where it is without having to see it.
  4. One drill we commonly use in Level 4 is "knee over curb". The idea is to find a point of reference other than your head/eyes to use, to judge distance to the inside edge of the corner. If you approach the corner with the idea that you are going to try to put your knee over the curb instead of positioning your head over it, you can see (looking at your photo) that your tires would be at least a foot closer to the inside, probably more. Another advantage of using your knee as your reference is that most riders can SEE their knee in their peripheral vision, which helps to judge position over the
  5. Good gracious, what a story. I spent in summer in Wisconsin and couldn't believe the number of deer there and they certainly can jump out very suddenly. Sounds like you have a good plan for really serious protective gear for future, which is great.... but is there a way you can find a place to do some track riding, where conditions are a little more controlled? Local track days, or riding schools? Have you ever considered getting into a mini-moto or super-moto bike that you could ride at local go-kart tracks? They really are a lot of fun and you can ride at a high level (performance wise
  6. Ah, this makes more sense, now I'm with ya. Yes, that is EXACTLY what a rider would have to do, if they were not strong enough to get a good lock on with the lower body, and not strong enough to support their upper body with their core muscles, they would be forced to use their arms to support themselves under straight line braking, then do their best to get off the bars when it is time to steer. What else could one do, other than trying to add tank grip or other anchoring devices to make it easier to lock on to the bike?
  7. A rider cannot change the location of the COM within their body, no. However they CAN change the position of their body. Do we agree that when a rider hangs off the inside of the bike, their COM is moved farther to the inside of the corner?
  8. What IS the purpose of the discussion, if you are not interested in handling issues? If this is a purely theoretical discussion and not directly related to real world riding, this is probably not the right forum for that sort of discussion.
  9. Do we agree that if a rider sits up high, that the rider's COM is higher than that of the bike, producing a rotational "moment" that wants to make the bike rotate around the front tire's contact patch and create a "stoppie"? If we agree on this point, then the remaining questions is: does that situation cause more fork compression? My thinking is that yes, it would, because the "moment" created is a new force, in addition to the normal braking/deceleration force from mass of bike & rider. (The farther apart vertically the COM are, the bigger that "moment" becomes.) That rotational for
  10. I didn’t follow your reasoning on why you “or 99.9% of the riding population” couldn’t try the experiment with the zip tie on the fork? We do very similar braking drills with students all the time, at schools.
  11. If the position of center of mass is not relevant, what do believe causes a bike to do a stoppie?
  12. Oh, now I understand your question and see why you are asking. Yes the front tire has to stop the mass of the bike and rider. The total mass (and thus the braking force required to stop it) doesn't change. However, the location of the rider's center of mass CAN change, and if the riders C.O.M. is significantly higher than the bike's center of mass, that introduces a new element, which is the lever action of the rider's upper body. That introduces a "moment", which is a rotational force, which acts (if the rider is bracing on the bars and using the bars to hold up the upper body during braking)
  13. No the rider's mass clearly doesn't change. However, we know the braking is causing a force on the rider. Where is the rider attaching to the bike in each scenario? Where does the force get transmitted to the bike, if the rider locks his arms arms and uses his hands to stay on the bike? What about if he uses his knees instead? How does the change the effect on the bike, on the forks? Hint: consider the location of the bike's center of mass, and how close or far away the rider's attachment point is from that, in each scenario.
  14. The best pressure setting can vary by bike/rider weight, by track, and by temperature and is not always the easiest thing to figure out. Best thing to do (assuming you are talking about track riding) is to ask the Pirelli race tire distributor, and be specific about what bike you have, what pace you ride (A, B or C group at local trackdays, for example, or tell them your typical laptimes), and whether it is expected to be cold or hot out. The Pirelli range given above is a good starting point; if you see any abnormal tire wear (tearing, or uneven wear) occurring, you can ask a tire provi
  15. No, not sold out, I'm not even sure if they started selling them yet. Best to call the office and find out when they will be available.
  16. That seems like an odd note. Straightening the outside arm makes more sense. The idea with pickup is to keep the body down and inside, but steer the bike up to get it more upright for better traction for the drive out. Keeping the body low and inside while bringing the bike up could mean having to extend the outside arm.
  17. Good on the warmers, one less thing to worry about. Yes, I was really happy for the Twist II movie to be available somewhere for instant streaming, I have the DVD... but no DVD player anymore! Now I can stream it on my phone from Amazon, so cool. If you do watch it, post a review! It doesn't have many reviews yet since it just recently got put on Amazon.
  18. Sounds like you have a lot of things taking up a lot of your attention - new track, new body position, new leathers, new tires - so I agree with Yakaru, definitely take your time and give yourself a chance to get comfortable, let eh speed come when you are ready rather than trying to push for it. With less free attention available things will seem to happen much faster and that triggers SRs, such as tension, target fixation, choppy visuals, etc. Focusing on one drill at a time is a good plan - maybe devote a session (or more than one) to finding more reference points in the places you fee
  19. We will be on the West side, which they also call the 2 mile course. Great that you are coming out for it!
  20. You can use your knee as a lean angle gauge. If you are touching it and still running wide it probably does mean you have too much speed, but it doesn't necessarily mean that speed is the ONLY (or even the PRIMARY) problem, for you, in that corner. For example, if you had a bad line or poor body position that could contribute to excess lean angle and thus limit your possible speed through the corner. If you are running wide and you don't know why it is happening, it sounds to me (especially in light of your prior questions in this thread) that you are riding over your head and pushing too hard
  21. This is actually a tough question to answer because it can depend on a LOT of variables (pressures, temps, suspension settings, tire fit to bike, riding style, etc.) and that is probably why you haven't seen much response. It does look like cold tear and it's interesting that it seems to be happening near where the tire changes from one compound (harder) to another (softer). Do you accelerate hard, in short bursts, with minimal lean angle? What is the tire size you are running, is it the same size as the OEM, or have you put on a wider tire? I agree with Yakaru that you should probably s
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