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  1. Yesterday
  2. AdamZisa

    Finally Got My Knee Down ! Yes !

    I look forward to this day!!! Hahaha
  3. Last week
  4. AdamZisa

    Las Vegas, Classic Course

    The first day at CSS for me and one of my favorite drills is riding the course for a sighting lap. Ride the outer perimeter for one lap, and then the inner perimeter for another. Ride over all of the surfaces, realize that they are not as slippery. Or look for dust and debris. This helps so much to make you less "edge shy" and become acquainted with the surface. I do this on my canyon rides now and the first lap of my track days. Looking forward to checking out Thunderhill in June!
  5. Hi all- Looking for opinions and options. In prepping my 5yo son's CRF50 for Supermoto, I discovered that the front fork is kinked just above the axle. It's pushed toward the engine a few mm, reducing trail. For dirt he's using the stock 10"/10" knobby tires and supermoto, using DOT treaded 10/10" size tires as well. His racing class requires OEM suspension and I've found the part numbers to order the replacement. I'm not sure if the handling change will be ONE MORE new thing that he'll have to contend with his first time out, or if as a 5yo he won't notice, won't care and will carry on bent or straight. I'm theorizing with the way they're bent now it gives added caster effect and is HELPING the bike steer after relaxing his countersteer input. I think it's wise to replace it but I'm wondering if we can instead save the $150 plus labor time and wait a season when he may be able to graduate to a class that allows aftermarket components. Thoughts?
  6. Earlier
  7. Jaybird180

    Can we do it again?

    Thank you. I still have a ways to go though I've made some good progress. Of the tracks I've ridden, ViR-N happens to be my favorite.
  8. Jaybird180

    best ergonomic mods?

    Many people buy a bike that's just wrong for them from the beginning. This is often the new rider who buys based on looks, buddies or moto-journaists' opinion. They live with the difficulty not knowing what they're missing. Sadly, many don't seek to modify what they have. Case in point is that you'll find many suspension settings left at the positions as delivered. On bikes above entry level you'll get adjustable hand and foot controls. I've kept aftermarket rear sets on my bikes; on my previous bike I needed a higher position. My current bike got them because I needed GP shift (is that an ergo mod?) and that was the only way I knew how to do it (found out about an aftermarket part later), but the stock position felt more comfortable, albeit with a slightly inferior lock on the tank. I put Apex bar risers on my bike during it's winter makeover. I've only ridden it twice in the new configuration, but it's more suitable to my body dimensions. Still needs a little tweaking though. I tend to like Stomgrips also. Unfortunately, my heat gun caught fire as I was preparing to add my newest set, so I didn't install them yet. Are mirrors an ergonomic item? I have a love/hate relationship with them- can't find a set that satisfies. I've had exactly ONE set that I liked but I seem DRAWN like a moth to a flame to buying something other than that brand...then I get disappointed and just resign to live with it until I break or scratch them, then I repeat the process. I've considered larger hand grips because...I've got big hands. And I wanted something more "cushiony". I think I"m good with the new ones I put on with the Apex set. I'll eventually get around to changing the windscreen. I think I need something with more wind protection. And I think the bike will look better with a tinted windscreen. I previously had an expensive European brand on it and I didn't get anything but it's good looks. I may have to go with an American brand that's more functional.
  9. What's the best modification or accessory you have done or added to your bike to make it more comfortable for you to ride, or put you in better control? For me, adding Stompgrip on the tank made a huge difference (on every bike I've had) on being stable on the bike, and adjusting the clutch and brake lever and the shift lever have made me more accurate with the controls. What have you done to your bike that has made it more comfortable, easier to ride, or put you more in control?
  10. Hotfoot

    Can we do it again?

    Congrats on your great wins and results, sounds like a lot of fun. Were you at VIR this week?
  11. Last year for my birthday, I redid L1 and the following day L2. I then turned around 2 weeks later and did L3, followed by L4. This year, again for my birthday on the same track I did L4 again. I rode the BMW S1000RR and had a blast! I didn't take lap times, but I could easily perceive my pace was quicker, smoother and safer since the last time I was at the circuit. I took a couple wins with me in that I realized at the consulting table with my peers that I went through the day and not once had a pucker moment. I had control over myself and the bike, even during the time when I blew my TP for T7. My other win was that I completed the day without the nagging of back pain that has come up over the years. I was able to use many of the L3 skills that I picked up and I also realized some areas where I can expand my new capabilities into and remove some old limitations. I can also say that I've had the pleasure of winding the S1000RR to WOT on the front and back straights. Maybe in the soon future, I'll be able to hold it there!
  12. Thanks for the reply and all of the tips. We'll be staying Fri and Sat night so we'll be sure to check out the museum. Hopefully we can turn this into a yearly thing.
  13. The school will have pretty much everything you need available - sunscreen, earplugs, water, snacks, etc. However, at Barber some things you could end up wanting to have: a folding chair, for break times - there is seating in the classroom, but you might want to have a chair you can put somewhere in the shade for times between class and riding. A comfortable, cool layer to wear under your leathers, either an undersuit made for the purpose or something like UnderArmour pants and shirt. An underlayer makes it a LOT easier to get in and out of leathers, plus being cooler and more comfortable underneath. A regular cotton tshirt can get bunched up or wet under leathers and won't keep you as cool as UnderArmour or an undersuit. The school does have undersuits for sale, in limited size/quantity, you may want to call ahead to see if they can reserve one for you in your size and find out the price. Drinks of your own if you have a preference - keeping hydrated is important, it can get hot at Barber. The school will have water and Skratch (an electrolyte drink) available. If you want to run a Go Pro, mention it as you register in the morning to find out if it will be allowed and to leave time to arrange for mounting the camera. As far as money goes - there are plenty of things to buy, T shirts, caps, track decals, not to mention bike parts and Stomp grip, so how much to bring is up to you. Credit card is fine for purchases and you will need a credit card for your equipment deposit anyway, so you may just want to bring that instead of a bunch of cash. Also Barber museum is nearby, and a giant Bass Pro shop, so there are lots of places you can spend money if you're so inclined. Consider making time the day before or after your school to visit the Barber Museum, it is AMAZING.
  14. Good morning. A few co-workers and I are signed up for the May 26th CSS at Barber and this will be our first time going to this school. We will be using school gear and bikes as well. My question is to all of the veterans of the school out there. Is there anything that you wish you knew or knew to bring before you got there? If we have go pro's will there be mounts on the school bikes or helmets or are we allowed to even mount them? Coolers with drinks or will there be stuff there? How much spendy cash to bring (will there be shirts, ect. for sale)? You get the idea, anything useful that you can give to guys who will be attending for the first time. Thanks for your time. Jeff
  15. Hotfoot

    Help - How to learn/start using knee sliders??

    I've only seen the Woodcraft ones in use, they seemed to work well for the purpose, and they were fairly thick. I haven't tried them myself but the person that was using them got them because he didn't like the sound or sensation of scraping standard pucks. I presume they wouldn't last as long as standard pucks if you dragged them a lot, but his were holding up fine. I have seen a few creative ideas - one person took a couple of stiff plastic zip ties and fed them through the Velcro under the knee puck so they stuck out like curb feelers, to try to touch those down. Not sure if he actually took that out on track or whether it worked, but I did think it was creative. :)
  16. CW! I am excited to try the crested hill again. When I go through it CCW, it looks like you can almost go straight through it.... I must be psyching myself out. I will see what I can learn at Level 4 in June!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Thunderhill raceway.
  17. mugget

    Help - How to learn/start using knee sliders??

    Cheers for the tip! I had completely forgotten about leather sliders, read about them years ago but have never seen anyone who uses them. Does anyone here use them or have a preference? I think there's really only two options - Klucky Pucks from Woodcraft, or Asphalt & Gas sliders? I will be getting myself a pair to try out. I also think the sliders that came with my leathers are really low profile to start with (it's a budget suit). At the narrowest section they only protrude about 17mm (0.6") from the suit.
  18. Cobie Fair

    Forum Changes

    We are going to do some changing, and consolidating of the forum, certainly we'd like to hear what you think of them so don't be bashful. Webmaster is not my first occupation, so expect to be entertained a little as we go through the process. Best, Cobie (Or in the parlance of the modern generation, "Forum Moderation Team" or some such generic un-signed complimentary close)
  19. jcw

    Can Weight Shift Theory be debunked?

    What a coincidence! This popped into my mind as well just this past week. And I was ruminating on it as well... Roll and Yaw are two distinct types of motion on the motorcycle. Most people think of roll (lean angle) when we think of cornering. But, what we are really looking for is yaw- getting the motorcycle to go around a turn. Because of the way our physical universe exists, the most efficient (perhaps only) way to achieve this yaw results in roll. Do you lean to turn or do you turn to lean. LOL. Anyway, I found this interesting technical, analytical real world article measuring this yaw and roll and various rider inputs here. http://bicycle.tudelft.nl/schwab/Bicycle/evertse2010riderMinApp.pdf I had to read it a couple times and only understand part of it, but it clearly shows the countersteering inputs applied in getting the motorcycle into a turn, the yaw rates and direction, the roll rates and direction, the steering torque and direction and the actual steering direction. It goes into gyroscopic moment (which might be what your original question was referring too) and how that initial countersteering input can itself contribute to the roll but minimally. Fascinating stuff.
  20. Jaybird180

    Riding a School Bike

    Just talked with the office. It's the F800R.
  21. When I talked with the Office staff, they made a point to remind me that there was another bike available other than the S1000RR for student rental, albeit in short supply. Can someone please remind me which model that is? Thanks
  22. Lnewqban

    Can Weight Shift Theory be debunked?

    You are welcome, Jaybird What you have been analyzing and trying to understand is very complex dynamics, reason for which most riders don't even bother learning the "why" of these things. The books that explain the whole interconnection of steering, wheels, masses, forces, etc. in a motorcycle are very dense to read and difficult to comprehend. I believe that there is value in understanding the basics of the Physics behind riding a motorcycle in a proficient way. It is difficult to explain those principles to inexperienced riders without going too deep into the subject and causing confusion. Most mentoring/teaching is limited to "do this to achieve that and go practice it". The experienced rider has the advantage of having tested what works and what does not, of having felt those forces and the reactions of the machines during enough time to make sense of those principles. If serious about this, by persistent observation during thousand of miles, an educated rider becomes more aware and more sensitive about the dynamics of riding and develops a finer input of all the controls and sense of balance. The Physics then becomes less abstract and more in harmony with our senses and minds. In order to function as a motorcycle rather than as a bag of potatoes, all the forces and moments acting over a motorcycle in different directions must be in balance. If our control inputs or road conditions break that balance, a brief transition period follows, during which the machine does its magic to self-adjust to a new state of balance. If that state is not physically achievable, a fall will follow. Counter-steering is a clear example of that: the rider intentionally steers the bike out of balance (out of its rectilinear path), inducing many reactive forces, movements and moments for a very brief period of time, forcing the machine into a new state of balance (onto a curvilinear path). If the machine continues on in one of the two states of balance, the rider is doing nothing or too little to modify those, like it happens in the No BS bike demonstration. If the machine is upset by incorrect control inputs from the rider, like closing the throttle during a big rear tire slide, the machine can go from stable cornering balance to unstable transition to out of balance (highside fall) really quick. The speed of the motorcycle is very influential about the steering, gyroscopic reactive forces, rolling and balance, reason for which counter-steering is so powerful in a superbike at high speeds, but almost negligible for a trial bike at walking speeds. http://www.dynamotion.it/eng/dinamoto/8_on-line_papers/effetto giroscopico/Effettigiroscopici_eng.html
  23. Jaybird180

    How Much Weight On The Seat?

    Makes it difficult for the front tire to follow the contour of the road.
  24. Jaybird180

    Can Weight Shift Theory be debunked?

    Thanks @Hotfoot and @Lnewqban for allowing me to work through this. I realized after re-reading this and a few other threads, thinking and letting it all sink in that I had been conflating separate movements of the bike. So I'll wrap it up thusly and perhaps bring this thread to a close. I've been thinking about this new chapter (I could almost swear it wasn't in my book before- LoL) and it seems that there's a jewel in there about the bike steering about the rear wheel (once leaned over). I realized that I'd been conflating the concept of a longitudinal rolling motion (leaning) the bike and the result of changing the bikes directional vector (turning). We can do all types of things to try to get the bike to follow a corner, but ultimately it's the result of the smaller circular circumference of the rear tire that makes the nose of the bike point in the direction with the lean, just like a coin standing on it's edge rolling in a circle. If this is true, the act of leaning and turning are 2 separate behaviors and are about different planes of motion. The leaning would be a roll about the longitudinal axis and turning would be a lateral movement or yawing motion about what is often referred to as Z- Axis. But these are still 2 separate changes of state of motion. I apologize if I caused anyone distress (other than myself). Eventually...I suppose, I'll figure the Motorcycle Theory of Everything (MToE).
  25. Hotfoot

    Can Weight Shift Theory be debunked?

    That helps a lot, yes.
  26. Jaybird180

    Experiments with Shifting Gears and Turn Radius

    Clicked on the Stoner book and tried to find it in print version. Not available until Nov 2018!!!!
  27. Jaybird180

    Can Weight Shift Theory be debunked?

    With effective leverage only basically parallel with the road and feet in an awkward (forward) position, this guy can describe to you pretty readily what makes his bike change direction This guy however, with his bodyweight over the steering stem may have a different perspective on what makes the bike change direction When I was at the school last year, Dylan explained in a way that I thought was brilliant (for me at least) what Keith actually described but didn't use the same words in TOTW. Keith used the word "countersteer" and then described the action of the front wheel tracking the trajectory of the turn. Dylan used the words, "countersteer" and "prosteer" in the same sentence and I had an "Aha! moment". A read through some writings dismisses as negligible any effect of bodyweight on the influence of steering. I posit that there are too many riders doing things with their weight on the bike to dismiss it and I think some of the absolutism may be obscuring the effects we have on the ability to steer a motorcycle through different intentional means. The reason I started this thread was because I didn't want to muddy another thread where I saw glimpses of the poster perhaps getting some traction in this vein until the thread got derailed and rather than reopen a can of worms, I settled on a cleaner path. As anecdotal proof of combined effort, (that's often cited) Dani Pedrosa is known for using the Hook Turn technique at corner entry and throughout the remainder of the turn. He uses it in combination with his steering input to get the desired result. Being a school, I understand (and support) clearly the many reasons why it would be desirable to teach and emphasize countersteering then (relaxing input and) prosteering (by the bike's geometry) as a primary means of control. I hope that my intentions are now made clear.
  28. Lnewqban

    Can Weight Shift Theory be debunked?

    Talking about chairs, it has occurred to me that we can discuss the actions of monkeys (passengers) in sidecars races. By moving around for each corner, they do what you describe about your folding chair: they relocate the total or combined center of gravity as far from the motorcycle or as close to the rear tire as possible. Rather than trying to make the motorcycle and sidecar roll, they compensate the natural rollover tendency during fast cornering as much as possible. That rollover tendency is induced by the combination of centrifugal effect and height of the center of gravity respect to the road. A regular sidecar could be comparable to the situation that you have pictured above: a motorcycle with a dramatic asymmetrical weight to its side. Would the bike yield to the induced roll? Let's say that thanks to the third wheel, that weight does not roll the bike over and instead keeps it vertical. If we weld the steering to the frame keeping the steering bar perpendicular to the bike and then make the bike and sidecar gain speed on a straight trajectory, the contraption will describe a straight line. As the bike happily cruises along, if we suddenly remove the sidecar wheel, even with the stability induced by the two remaining main gyroscopes of the contraption, that asymmetrical mass or weight will be able to roll the bike until the sidecar axis hits the ground (the lateral balance will be lost). The bike, even while leaned over, will try to keep going along the straight line (assuming no dragging forces from that dragging axis) because the steering has not changed. Riding with a Motorcycle Sidecar: http://www.steves-workshop.co.uk/vehicles/bmw/sidecar/riding/sidecarriding.html Yes, a substantial weight with some lateral leverage is able to roll a motorcycle in movement or tip the stationary chair of your example over. Nevertheless, without the complicity of the steering capability, the bike will not turn, even if leaned over. The following video shows that the steering capability of a motorcycle, with or without a sidecar, has a powerful influence regarding directing it onto either a straight or a circular trajectory in a precise and controlled manner ....... and what it seems more important: combined with speed and rider's skill, it is able to lift that asymmetrical weight and keep it balanced at will, even on a left turn, in which the centrifugal effect tries to take the chair down. The maneuver is known as "flying the chair". https://www.youtube.com/watch?v=k6ZSSPY32Jk
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