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03-26-2013, 05:32 AM   #1006
ohgood

Joined: Sep 2010
Location: alabama
Oddometer: 2,868
Quote:
 Originally Posted by bumbeen Ok here's what I think, still not to a real computer... On vacation in Hawaii so posting from the phone. Turning radius is determined solely by steering angle and lean angle of the bike. If you are at max steering lock and max lean angle, you will turn in a certain radius. If you are counter leaning and doing this max lean and max lock at 7mph. That means if you try it at 12mph you will not be able to counterlean because you need more weight on the inside of the bike to maintain the force from gravity to balance against inertia wanting to throw the bike out of the turn. Therefore you may sit straight in the saddle to provide enough force from gravity to counteract the increased lateral force. Given this increased speed, we have increased lateral load on the tire, making you more likely to slide out. I don't think this changes your turning radius or am I wrong? Turning radius is determined by lean angle and steering lock. A specific riding position, steering angle, and lean angle fixes your speed and turning radius. Yes?
mmm, that's math. I have no idea. we can try stuff on the bike though, its more fun anyway. :)
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ohgood screwed with this post 03-26-2013 at 05:39 AM

 03-26-2013, 08:01 AM #1007 Motogymkhanaman Gnarly Adventurer   Joined: Aug 2012 Location: Stratford on Avon, England Oddometer: 211 Tabibito-san giving his Street Triple the berries at the recent Moto Gymkhana event in Japan. Sadly he just missed winning by a fraction of a second. Worth watching this video to see how quickly he can capsize and recover the bike. __________________ Dedicated to the wonderful sport of Moto Gymkhana
03-26-2013, 10:57 AM   #1008
Coachgeo

Joined: Mar 2009
Location: NOW: Dayton OH area recent past WAS: North TX
Oddometer: 519
Quote:
 Originally Posted by Redclayrider You can go to the AMGRASS site here and ask, http://amgrass.com/ I see a lot of the same members here but it is another resource.
Been there. Left message. NO reply.

03-26-2013, 12:44 PM   #1009
ohgood

Joined: Sep 2010
Location: alabama
Oddometer: 2,868
Quote:
 Originally Posted by Coachgeo any know of Southern OH or Northern KY moto gymkhana groups or groups forming? Contacts?
amgrass is grass roots... if you don't have interest in your area yet, guess who gets to spread the fertilizer ? ;-)

ill check in at amgrass and get the cheifs stirred up. again, its grass roots, not a box store with a payment plan, sorry :)
__________________
Yes, Android AND iphone GPS works without cellular data. Use offline maps and enjoy. (thanks drtbyk!)

 03-28-2013, 05:58 AM #1010 liquid_ice Gnarly Adventurer   Joined: Aug 2011 Location: The Netherlands Oddometer: 117 I love reading this thread not only to see how gymkhana lives in other parts of the world, but also because once in a while I learn a new bit of English. Needed Wikipedia to know what Grassroots was.
03-28-2013, 09:13 AM   #1011
Redclayrider
Long time gone

Joined: Oct 2012
Location: Way down in the southern lands
Oddometer: 765
Quote:
 Originally Posted by liquid_ice I love reading this thread not only to see how gymkhana lives in other parts of the world, but also because once in a while I learn a new bit of English. Needed Wikipedia to know what Grassroots was.
Homegrown :)

 03-29-2013, 07:46 AM #1012 liquid_ice Gnarly Adventurer   Joined: Aug 2011 Location: The Netherlands Oddometer: 117 That is how they grow the roots of grass over here in Amsterdam But now we are changing the subject
 03-29-2013, 10:21 PM #1013 Storm Shadow Thread Ninja     Joined: Jan 2011 Location: Arashikage Clan Oddometer: 1,499 Doing u turns. Leaning putsbthe contact patch on the side. Which puts the turning circle smaller. If u have a toy bike that the bars move or a curved side bike wheel have a play and u will notice the difference. Bikes fall over id arnt moving and leaning. So gota keep forward momentum up to fight gravity. So to keep speed down and forward momentum up rear brake is the easiest.if ur doing gymkhana and not trying to keep speed down u dont really need it. It does make you feel in control better. I dont "think" it reallyndoes but it Just feels like planting the rear wheel as a fixed pivot point. send on a small touch screen by a guy with fat fingers Storm Shadow screwed with this post 03-29-2013 at 10:29 PM
 03-30-2013, 07:22 AM #1014 Sckill Gnarly Adventurer     Joined: Feb 2012 Location: NYC Oddometer: 233 Hi everyone. I'm an aspiring Moto Gymkhana newbie and just finished reading through all 1000+ posts of great information on techniques and bike control on this thread. Weather is improving so I'm looking to spend more time outdoors improving skills on the bike besides just commuting. __________________ Current: 2012 Yamaha Super Tenere, 2007 Honda CBR600RR Past: 2006 Honda 919, 2004 Honda 919, 2007 Honda 919, 2008 Suzuki SV650S
 03-31-2013, 03:30 AM #1015 liquid_ice Gnarly Adventurer   Joined: Aug 2011 Location: The Netherlands Oddometer: 117 Compliments on reading it all, it's quite some work. I hope the weather keeps improving and you can start practicing.
 03-31-2013, 04:01 AM #1016 Storm Shadow Thread Ninja     Joined: Jan 2011 Location: Arashikage Clan Oddometer: 1,499 86 pages now, a bit of knowledge on riding i recon... especially if u watched all the youtube videos
 03-31-2013, 05:18 PM #1017 liquid_ice Gnarly Adventurer   Joined: Aug 2011 Location: The Netherlands Oddometer: 117 Knowledge only gets you so far, In theory I could be quite fast Lets not talk about in practice But as with everything, knowledge is a nice place to begin with for whole lot of practice.
 03-31-2013, 11:51 PM #1018 Vulfy OP Studly Adventurer     Joined: Feb 2012 Location: NYC Oddometer: 567 I was wrong...
 04-01-2013, 12:18 AM #1019 ErikDK Gnarly Adventurer   Joined: Apr 2012 Oddometer: 188 Prabably 205, but:
 04-02-2013, 04:37 PM #1020 Bent_boot42 Adventurer     Joined: Jun 2011 Location: Vancouver Island, BC, Canada Oddometer: 50 I just finished reading every post in this giant thread... though I didn't manage to watch EVERY youtube video. Lots of good info here, thanks to those who take the time to explain so much. I can't wait to get started but I gotta put my bike back together first I am guessing that my 1986 Honda XL250R with a broke man's super moto setup (cheap shinko street tires on 19inch-rear/21inch-front rims) should be a good bike especially since I don't mind much about laying it down. Reading about all the different techniques and the physics of bike control is very interesting from a TRIALS riding perspective as well... Motogymkhana and trials are both VERY TECHNICAL riding sports that require huge amounts of bike control and don't require any 'high-speed-bravery' or '100ft-jump-bravery'. Don't get me wrong, there is bravery invovled with trials and motoGym but it is a different kind of bravery and the penalty/crash when you get it wrong is (usually) fairly minor when compared to other moto sports like motoGP or MotoX. Here is a sample youtube of trials riding (for those unfamiliar with this branch of dirt-biking http://www.youtube.com/watch?v=g9An21JLUNg) I liked the questions from bumbeen, they are worth asking, and they did allow motoGman to explain some more interesting points about motoGymkhana. In that light... what about this for a faster method around the 180o cone: pop a big endo/noseWheelie/stoppie as you approach the cone... shift hips so the back end swings around .... drop rear end so you end up facing the other direction and off you go. You would lose a bit of time in braking but that should be made up in not having to actually do any turning. You would also need to be DAMN GOOD at stoppies but it is possible, no? I know the first response will be for me to try it and time myself ... I will, next weekend (on my trials bike). PS. Anybody in Victoria, B.C doing motoGymkhana already? PM me! Bent_boot42 screwed with this post 04-02-2013 at 04:46 PM

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