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I think the crux of this whole issue, and one that should end all the debate is the difference between street riding vs track riding. Things like crankshaft wear, clutch wear, and tire wear are going to be much more in evidence at the track which is full-time aggressive riding--and probably not in evidence at all for street riding.

Even aggressive street riding is a momentary thing. No one is out there pushing the bike to redline for 3 or 4 straight hours. You're forced to slow down a lot of the time for traffic and road conditions. Even at The Gap you're going fairly slow compared to a race track. You just won't be putting the wear on the bike that you do at the track.

So Code's technique is aimed squarely at track skills. Sure, he mentions where it might be beneficial for the street... naturally he wants a broader audience to sell his book and school. But is it really needed for street riding? No, I don't believe so. That's why you get different direction from the MSF course. They are teaching new riders how to ride safely and legally on the street, not how to win races. So they are going to teach the easiest way to control the bike at street legal speeds. That's why they don't teach how to trail brake or pass in turns, how to tuck in, or lean off and get a knee down. Those are not street techniques, they are race techniques! Code's technique is not something a brand new rider can learn in a two day course. Its for experienced riders.

This is a very important distinction that cannot be overlooked. I'm sure its a fine technique if you have the experience and skill to use it, but its not for everyone.
 
While this technique is born on the track and is mostly utilized there, its still beneficial to learn and practice it for street riding. Particularly in situations where you have to stop very aggressively, such as when vehicles in front of you traveling at a decent speed decides to slam on the brakes. This technique allows you to slow the bike faster in a minimal amount of distance without upsetting the bike causing it to fishtail/endo. I use this technique quite often for both track and street riding, and can think of at least several incidents where I avoided an accident on the street with it.
 
While this technique is born on the track and is mostly utilized there, its still beneficial to learn and practice it for street riding. Particularly in situations where you have to stop very aggressively, such as when vehicles in front of you traveling at a decent speed decides to slam on the brakes. This technique allows you to slow the bike faster in a minimal amount of distance without upsetting the bike causing it to fishtail/endo. I use this technique quite often for both track and street riding, and can think of at least several incidents where I avoided an accident on the street with it.
I'm having a hard time seeing how in an emergency stopping situation you are downshifting along with hard braking. If you have enough time to engage your clutch, stomp a gear, release clutch, slow, engage clutch, stomp another gear, release clutch again, I'm figuring it wasn't too much of an emergency. If cars in front of you slam on their brakes you don't have time to drop gears, you grab a handful of front and hope you don't lock the rear.

I can see the technique being used when you know you are needing to scrub some speed ahead of time (planning to slow for a turn) but not in an emergency situation. Downshifting too quickly can cause a fishtail also, I do it more than I like when I forget which gear I'm in (dropping into second or even first occasionally at too high of a speed). Downshifting slows the rear tire similar to using the rear brake (not exactly the same but basically). Maybe I'm missing something. I'm not a track rider but have been riding bikes for over 15 years.
Toran
 
I'm having a hard time seeing how in an emergency stopping situation you are downshifting along with hard braking. If you have enough time to engage your clutch, stomp a gear, release clutch, slow, engage clutch, stomp another gear, release clutch again, I'm figuring it wasn't too much of an emergency. If cars in front of you slam on their brakes you don't have time to drop gears, you grab a handful of front and hope you don't lock the rear.

I can see the technique being used when you know you are needing to scrub some speed ahead of time (planning to slow for a turn) but not in an emergency situation. Downshifting too quickly can cause a fishtail also, I do it more than I like when I forget which gear I'm in (dropping into second or even first occasionally at too high of a speed). Downshifting slows the rear tire similar to using the rear brake (not exactly the same but basically). Maybe I'm missing something. I'm not a track rider but have been riding bikes for over 15 years.
Toran
So, how about this (it actually just happened to me on the OH Turnpike Sunday night - although I was in the car)?

I had just come through the easternmost toll plaza, and traffic was accelerating back to an extra-legal pace. Traffic wasn't too heavy, but it had been congested by the plaza. There were two cars in front of me, one in either lane, and they both just slammed on their brakes for no apparent reason going from 60 down to about 10mph, then they both swerved in opposite directions and I saw a huge alligator (cast off truck retread) in the road. After swerving around, we all accelerated back up to speed.

In a situation like that on the bike, if you just threw out the anchor, without downshifting while braking, you would have been left at almost a complete stop in a gear too high to get rolling again with any sort of urgency, and would have been a sitting duck to any vehicle approaching you from the rear, while you feverishly tried to downshift your bike to the appropriate gear to get moving again (which sometimes doesn't work too well when going really slow, or stopped).

I'm not saying you would need to appropriately rev-match every gear while you are braking, but you had better get used to stomping on the gear lever while you are braking, so that if an appropriate escape route presents itself, you can take it with conviction. I'm actually pretty sure this technique is part of the MSF curriculum.
 
I would downshift without trying to use it to slow myself... in an emergency situation I am grabbing a handful of front brake (assuming there is no steering out of it), I'm not trying to use downshifting as a means to scrub speed. Even if I didn't downshift as I'm braking grabbing the clutch and stomping down two gears is not a problem once I know I am safe. Downshifting to be in an appropriate gear while braking is very different than downshifting as a means of scrubbing speed. I also think it is (for me at least) much easier to stomp a couple gears down if I had to accelerate than it would be to try and rev match downshifting (or even anything close to it) while trying to brake hard in an emergency situation. I was referring to an emergency "car slams on the brakes in front of you" situation. If the situation is such that you have the time to grab clutch, downshift and release clutch (and repeat a couple of times) I'm not sure how dire the situation was. If it was dire I don't believe you have the necessary time to use the clutch/engine breaking as means of scrubbing speed.

When you see people work on hard braking or are trying to show how quick they can bring a car/motorcycle to a stop from say 60 mph to 0 (for test comparisons or what not) you don't hear the engine downshifting, you see the car/motorcycle eat the brakes as hard as possible. I'm not at all opposed to using downshifting as a means for scrubbing speed on the track or street (I do it all the time) but not something someone should even think about worrying about in an emergency situation. If someone out there is able to show me how they could stop quicker by downshifting while braking vs. simply using the front and rear brake please post a vid on youtube, I'd love to see it (and would gladly eat my words).
 
We appear to be in agreement, I must have misunderstood your earlier post.
 
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