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JohnCBoukis last won the day on November 9

JohnCBoukis had the most liked content!

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About JohnCBoukis

  • Rank
    Cornering Apprentice

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  • Gender
  • Location
    Cleveland, Ohio
  • Interests
    author, guitar, drums, photography, motorcycling

Previous Fields

  • Have you attended a California Superbike School school?
  1. Dirt vs Asphalt riding styles and technique

    1) Why do dirt bikers push the bike beneath them? "Because they can." Why do they not hang off? For what purpose would they do this? Can one flip a road bike side to side merely by shifting their weight? No, but one can do this laying the dirt bike beneath them, so this is actually an advantage in turning for the dirt bike. If you began a 180° from a crawl or a stop as dirt bikers do, this actually necessitates putting the bike underneath you. So I would say slow speeds and extreme turns physically necessitate this. To your point, dirt riders could hang off with their weight still on the outside peg, versus standing vertically on the outside peg like they do. However, that would be more work than merely laying the bike underneath, and their bodies would then be hanging out in traffic, traffic which is close or already colliding with them; more physical effort, with less safety, and for what purpose? There are lessons on this forum on how hanging off gains ground clearance. This is not a core problem on a dirt bike that has suspension travel designed to handle 5-story landings. One simply does not care about keeping a dirt bike more straight up. 2) You exclude the rut from your question but ruts and general degradation that quickly build up after the race start, and steeply banked turns are going to dictate many of the best paths on a given motocross track before other choices come into play. Any single gouge in the track surface is subject to directing the rider to another path that has more traction. A lot of motocross is correct obstacle execution at the correct speed (which is not always the fastest speed.) For the remaining rider path options I am going to make an uneducated guess that on a short motocross track that is only 5-8 meters wide, at speeds that are slow compared to road racing, the obstacle and turn execution will be much more contributory to the race times than an inside-out movement would be. Lastly, many obstacles such as whoops or jumps are approached best at a right angle. If one had to approach the road straightaway at a 90° angle, that limitation would completely throw away the path that clips the apex. Someone here described dirt biking as "point and shoot" and I think that says it concisely. The dirt has stops and starts and right angles but the road dictates a smooth, turn-interconnecting racing line. Thus they each have specific techniques which serve them.
  2. What happen here?

    I waited for someone else to jump in, but I will answer it. The rider is steering back and forth in a vain attempt to warm up the tires. To answer Hotfoot's question about effectiveness, here is an older post which contains cool references to studies: Note the comments on the effectiveness of the sun. The sun heats primarily via infrared light. This electromagnetic spectrum can penetrate deep inside of objects which convection (heating air and circulating it) or conduction (direct contact) will not do. Unfamiliar with the current technology, my research shows that some tire warmers now take advantage of IR.
  3. Seems you do not need wide radials

    The leader is perpetually sliding and holding the bike up with a flat foot on the inside. He is in a different mode from the street bikes, say dirt bike mode. He is not beating the limitations that bound the road bikes but he is using a different technique.
  4. Body to Bike Ergonomics

    They do not. The ab contraction is changing the model. It turns out this is a statics problem. Making the torso rigid is transferring the energy elsewhere, from back support applying vertical weight on the seat, to rotational inertia. These two are chocolate and peanut butter. Note that using the back to support the torso transfers the torso weight to the seat. That is what is going to change with the ab contraction. On the bike, if the abdomen is held rigid and the legs are held rigid (they are pretty rigid as they do not bend like the back), then the body will want to rotate forward, pivoting on the seat. The feet resting on the pegs prevent this rotation. So the weight the back previously put on the seat is now resting comfortably via the feet on the pegs. Experiment: Sit in a chair or on the bike, flex the abs, and lean far forward. Relax the abs then flex the abs. If you are sensitive enough you may feel the increase and decrease in force on the bottom of your feet, and with each change the opposite feel of force on the seat. Here is what I can think of: Functionally isometrics allows us to hold objects. If I hold a plate or a pen in my hand and do not move, that is an isometric. Holding our torso up vertically is similar. Design wise, one can become infinitely strong without any equipment by doing isometrics. Of course the strength is over a limited motion area, due to being applied at a point or over a very limited range. Also when injury causes immobility one can begin recovery via isometrics. If motion is painful, one can still build the muscle up. If one was trapped under an object that is extremely heavy, they may not be able to lift it in one motion. They can slowly lift it, hold it there, then lift it more. This combination of isometrics and motion allows us to do work that taxes us to our limits.
  5. Body to Bike Ergonomics

    Muscles can contract and generate movement or they can contract without generating movement. Ever do isometrics? The abdominal or core contraction you guys allude to would be an isometric. The muscles strengthen, and there is no movement.
  6. Maverick's riding style disected

    Too true! By my comment is in context of the discussion regarding Crutchlow's peak heart rate of 192 bpm and points such as Spaghetti's about avoiding excess fatigue. If this rate was measured since 2015 while on his Honda, CC may be desperately trying to get that rate down as he unwillingly fights his current bike.
  7. Maverick's riding style disected

    Crutchlow recently indicated that he is physically struggling with the RC213V, and provided the metric that his heart rate is 16 bpm higher than while riding a Yamaha: http://www.autosport.com/news/report.php/id/128431
  8. Intro To Css

    At Amazon they have Twist I in used but very good condition for $9.51, and Twist II for $11.98, both fulfilled by Amazon with free shipping if the order reaches $25. However, this rider needs to scrape up five more dollars than the given limit to make this purchase of both books. In speaking with my local librarian I learned that book borrowing in this area is far overshadowed by multimedia today. The person you are dealing with may be part of the generation that would tend to choose multimedia. So it may be an uphill battle pushing the book recommendation, but I personally would explain the advantages of the books that others mentioned, that they are more detailed than the videos and that they can be referred back to easily. Signed, Highly Biased Book Lover
  9. Street Skills And Road Engineering

    Maybe this could also use an additional sign warning of the curve and steep grade? Many times there is the additional factor of other vehicles tailgating the motorcycle and not paying attention. Since speed tends to not be a concern for the driver of a car or truck, for any such drivers not paying attention, there is the risk of them going right through the motorcyclist during the slowdown. Thus, your warning of the signage applies just as well to the follower as to the lead motorcyclist, yet another reason to seriously consider the sign change. Often here in the US the catalyst for additional signage is a certain number of accidents or deaths. Perhaps they mentioned this metric in the meeting? According to the local law, how many accidents or deaths would result in a change to this signage? A number of citizen complaints may not be meaningful to the council. I have seen such on the news many times, dangerous areas where people complained to the municipality and they did nothing. After two or three or four deaths, that same area looks like a Christmas tree, with warnings and even superior lighting. In fairness to the council, citizens probably request expensive things from them daily. In unfairness to their decision, it sounds like you are the expert witness in this case. After some of the conditions I have encountered, it certainly seems like traffic design is universally engineered for cars with motorcycles being an afterthought. Looking at this from afar it appears that the council's decision reflects this tenet too.
  10. Chicane Or Multiple Linked Turns

    One of the preeminent sport bike books that I read demonstrated chicanes extremely well, but I cannot recall which book it was. Committing what is an unspeakable act for me (I think I can type it though), I lost my notes from that book. It showed examples of individual turns and an optimal racing line for each one. It then connected those same turns and contrasted how an optimal path through the chicane differs from the paths of the isolated turns. I understand the concept but those diagrams demonstrate it well. If someone can help identify a reference with a good sampling of diagrams that illustrate this concept, that would be extremely helpful. Thank you.
  11. Hello, my name is John, I am in my 40's, and I began riding in 2014. It has been a thrill on many levels learning how the motorcycle works. I did read many of the preeminent sport bike books. Among the techniques, I found what Keith has taught I can immediately feel and apply. (Some of the educational approaches did not feel right.) Pivot steering in particular provides a fast, smooth, and nearly effortless lean. (Thank you Keith.) I joined this forum as part of my continuing education. Regarding the word "countersteering": I am unable to find any variant of this word in Webster's dictionary. I am curious about the history of this word, when it was first used and by whom. It seems to have been part of the common lexicon for quite a while now and thus it seems past the time for it to be included in all of the major dictionaries. Who is in charge of all of the motorcycle words anyway?