# Dylan Code

Superbike School Riding Coach

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## Previous Fields

• Have you attended a California Superbike School school?
yes

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1. ## Contact Patch Vs Grip

Your collection of data and research shows you are barking up the right trees. Here's some more data regarding tires: Per the Dunlop engineers tires grip in 4 ways: 1) Adhesion--the temporary chemical bond between the tire and surface. 2) Keying--the tire deforming and filling in all the nooks and crannies of the asphalt or squishing into the depressions. 3) Abrasion--the tire tearing from itself or wearing away. 4) Hysteresis--the energy storage and return by the rubber and partial conversion to heat. The first two can be looked at as static properties and the last two dynamic properties in my opinion. I'm still learning on all this stuff and when talking to the tire engineers, they don't have all the answers either. Heck, aviation engineers still can't all agree on exactly how a plane flies through the air!
2. ## Turning is Braking

Thanks very much. We have more on the way!
3. ## Turning is Braking

Yes, the amount of lean and overall speed from wind resistance would matter a lot. Turn-in rate would matter I suppose but not significantly. Wind resistance going straight requires a certain amount of power just to maintain a particular speed. A hypothetical example is here: 30mph=1hp 60mph=8hp 120mph=60hp 180mph=190hp
4. ## Turning is Braking

The answer to the question is: from turn-in, off throttle, not trailing the brakes, the bike will slow at the rate of between 3mph to 8mph/sec. Lots of variables of course but that's the quick answer.
5. ## Contact Patch Vs Grip

I remember this thread from long ago about friction. I've been going into tire grip and the elements affecting it for some time and had this recently pointed out to me: The laws of friction were cited with regard to tires. But there just one problem: those laws only apply to RIGID objects. Because a tire is not rigid, the law would not hold true.
6. ## Dunlop Q4!

Coaches find that between sessions if they wait for their student to come around the track that their tires cool down enough to not provide sufficient grip. So in some cases they can lose their temperature within three or four minutes.
7. ## Dunlop Q4!

The miles are the same in a day.
8. ## Dunlop Q4!

Try this video for warmer questions
9. ## Dunlop Q4!

I've ridden many different tire sizes on different bikes and really can't tell much of a difference once I get a few laps on them. I've ridden a 1000 with a 180 rear and it was fine... if you A/B compared you'd feel the difference I'm sure. Slicks last longer than street tires, at least the Dunlops do. Heat cycles are what our coach tires experience all day long every day they are ridden. It may make a 3% difference but nothing anyone could feel easily. 1) Don't sweat the size issue. 200's are fine. The AMA 600 class used to run 200 rear slicks... 2) Get slicks if you want durability (and grip). 3) Use warmers with the slicks to ensure you don't get a cold tire crash. 4) Worry more about tread depth than heat cycles.
10. ## Dunlop Q4!

Yes we sell those tires and also Chicken Hawk warmers.
11. ## Dunlop Q4!

Slicks will last longer, maybe almost twice as long as the qualifier 4 rear.
12. ## dynamic theory

To directly answer your question: more handlebar turn. Same radius and speed, but less lean angle would be more turn of the handlebar into the turn.
13. ## Engine braking - Pros and Cons

MotoGP riders are typically trying to dial up as much engine braking as possible. They can also dial it in or out for specific turns by GPS. If you are riding a track that is very "stop and go" with a lot of braking zones, I would dial it up. If it is a flowing track with transitions, I would use less engine braking so the bike does not pitch forward if you feather out of the throttle in a transition.
14. ## Best small dirtbike for practice?

Yes like mentioned above TTR125 or CRF150. I also recommend going to a school first that uses those bikes to try before you buy, like Rich Oliver's school or American Supercamp.
15. ## Women In Wsbk Racing

The only reason there are no female racers in the MotoGP class is that too few enter at the bottom as youth racers. It probably takes between 3,000 and 5,000 youth racers to eventually end up with one who is capable of racing at the highest level. This includes having the family with the means and support and Olympic-level dedication to the child to make it past all the barriers to succeed.
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