
Forum 
Topics 
Posts 
Last Post 
Moderator(s) 

Motorcycle Safety



General Discussion This forum contains all general interest motorcycle safety oriented discussions. 
4637 
59274 
08/03/2020 6:31 AM by: James R. Davis 
Indiana Randy 


Safety Gear This site is pro ATGATT and here is where you can talk about safety gear to your heart's content. It is okay to mention specific brands by name, but it is NOT okay to post commercial messages here. That is, a member can promote what he likes based on experience, but a vendor cannot post a commercial here. 
173 
1385 
11/11/2019 9:54 AM by: onthebeach 
Axiom2000 


Rider Training Courses MSF (and other) rider training courses. PROS and CONS. There is no bias here. No commercial postings allowed. 
339 
5104 
08/26/2019 2:34 AM by: Donryu 
Axiom2000, gymnast 


Sharing of Lessons Learned Every time we take our scooters for a ride we learn something. Share the knowledge here. 
986 
11159 
07/22/2019 4:17 AM by: Vlad 
The Meromorph 


Campfire chat Here we tell the amusing things we usually talk about around the campfire after a day's ride. 
918 
8189 
12/22/2018 12:54 PM by: rkfire 
Cash Anthony 


Physics and the theoretical Here we talk about hard facts  how the motorcycle actually works, physical dynamics, modeling of behavior, and maybe some 'what ifs' 
264 
4063 
07/30/2020 1:19 AM by: Oggiedoggy 
James R. Davis 


Aging and Disabilities This forum provides an area to discuss the unique problems and coping mechanisms associated with aging and certain disabilities.
If you are too young to relate, it's just a matter of time. 
35 
363 
09/07/2018 12:00 PM by: DataDan 
rayg50 


Technical/Maintenance Questions and answers for those of you who like to do your own wrenching. If you're having problems with your bike, we're here to help! 
1321 
10710 
05/12/2020 2:59 PM by: Eagle Six 
greywolf 


Contrary Opinions Here is where you may voice your contrary (to my own) opinions so that others may read them. 
79 
1865 
07/29/2020 10:12 AM by: JanK 
James R. Davis 


Trip Reports Members who wish to share their motorcycle trips with the rest of us are encouraged to do so here. Pictures welcome! 
251 
1343 
09/17/2018 10:28 AM by: onthebeach 
Indiana Randy 


Motorcycle Accident Reports  WITH COMMENTS Here you may post reports of motorcycle accidents from whatever source you please  Newspaper, TV, YouTube, other boards  but along with posting a link to that source you MUST add value by providing comments about what the link is about, why you posted it and what you think we might learn from it. 
438 
3076 
10/31/2018 1:15 PM by: rkfire 
dhalen32 


Roadcraft Despite evidence to the contrary, the MSF approach to rider training is not 'all there is' or even 'the last word'. Here we can focus our attention on one such alternative body of training knowledge  one that is rather more intelligent and well considered than MSF's curriculum. England is the genesis. 
24 
400 
05/09/2012 1:27 PM by: DannyC 
gymnast 


Polls This is the domicile of our polling messages. 
121 
1668 
08/31/2016 7:44 PM by: rayg50 
dhalen32 

Wendy Moon Archive


How To ...



Buying a used bike  is this a good deal? Here is a forum in which you can ask for and discuss used bike purchase questions like: Is the price reasonable? What else should I ask for? Can the seller REALLY have just installed a NEW stator on this 28 year old bike I'm thinking of buying?
What this forum is NOT for is listing YOUR bike for sale. 
12 
95 
11/12/2013 9:44 PM by: kacinpa 
Indiana Randy 


Addons / Customization Want to make your bike a little different from the next guy's? You might find in this forum how our other members tackled the nitty gritty of making those changes. 
111 
628 
07/26/2014 7:46 PM by: SkootchNC 
Axiom2000 


Improve your skills Yep, parking lot practice is fundamental. But some of you have found other ways and may be willing to share here.
NOTE: The first time somebody posts a HOW TO DO A WHEELIE OR STOPPIE post this forum goes away. 
89 
907 
07/01/2014 11:04 AM by: MotoGG 
dhalen32 


Preventative Maintenance Some kinds of maintenance (most, actually) should be done by trained professionals. But there are lots of things you can do for yourself. Here you can share the how to's with our other members. 
33 
261 
08/19/2013 9:53 AM by: rkfire 
greywolf 

Off Theme



Bitcoins A new form of currency that can make a significant difference to how you buy and sell goods and services  or invest!
In this forum we discuss what it's all about, how to get involved, and how to use Bitcoins for commerce and investments. 
6 
32 
03/27/2020 7:35 PM by: James R. Davis 



The Get Your Motor Running Chat Forum This is an area for nonsafety related posts that are neither political or humorous in content. Robust discussion, digression and expression is encouraged. Come on in as the water is fine.

469 
3987 
07/14/2014 10:36 PM by: AaronC 
rayg50 


New Member's Corner Members only Our newest members have a place to hang until they get comfortable with the board and the old salts who frequent it. Here you may introduce yourself, tell us a bit about yourself and your interest in motorcycling, and ask questions about how to get around (and along) in this large site. 
561 
3180 
08/06/2015 7:22 AM by: commonground 
Cash Anthony 


Birthday Wishes  (Mature Themed) Members only A Place to Acknowledge and Celebrate that Special Day in a Member's Life. Open at your Own Risque. 
190 
616 
12/01/2013 9:00 PM by: aidanspa 
Axiom2000 


Humor ... the lighter side This is the place to share a bit of humor.
Good taste and courtesy, please. 
914 
2483 
03/15/2015 3:01 PM by: gymnast 
Cash Anthony 


Puzzles and Games Here we make room and time for diversions of the mind. 
50 
304 
07/12/2013 12:58 PM by: aidanspa 
James R. Davis 


Event Announcements You may post announcements of benefit and other events here. Stale posts will be removed for you. 
0 
0 
* Today * 12:35 PM 
James R. Davis 


Acknowledgements Let's hear about your "attaboys," wherever they come from. 
10 
30 
12/02/2013 3:51 PM by: greywolf 


Odds and Ends



Build Post construction 
0 
0 
* Today * 12:35 PM 



Subscriptions How to remain current on message content here without having to connect to the forum. A real time saver for all of us. 
1 
1 
02/05/2004 2:20 AM by: James R. Davis 



Testing place Here you can try out various board functions without being concerned that you might adulterate other areas of the board. I will clean this forum out from time to time so you should NOT expect your messages to last long here. 
5 
12 
11/26/2018 8:55 PM by: Vlad 
Cash Anthony, Indiana Randy, James R. Davis 


Glossary A list of specialized words, phrases, and abbreviations found within the motorcycling community along with their definitions. 
173 
173 
02/03/2011 5:11 PM by: James R. Davis 



Board Enhancements or Problems This forum will be used to discuss enhancements and problems that need attention. 
85 
484 
03/30/2018 9:40 AM by: scottrnelson 



How to use the forum Here you will find discussions on how to use this forum with suggestions on getting started and best practices. 
34 
99 
06/15/2011 9:30 AM by: scottrnelson 


Questions & Answers



Ask Our Administrators Here members may ask questions of our Administrators and only our Administrators are allowed to respond. Our Administrators are personally responsible for the integrity of the site, its functionality, and the overall behavior of its staff and members. 
18 
44 
06/14/2013 8:21 AM by: James R. Davis 
James R. Davis 


Ask Our Moderators Here members may ask questions of our entire set of Moderators and only our Moderators are allowed to respond. Our Moderators have individual responsibility to manage one or more of our forums. QUESTIONS HERE SHOULD DEAL WITH MODERATOR RESPONSIBILITIES, NOT MAINTENANCE ISSUES, FOR EXAMPLE. 
2 
8 
05/18/2011 6:17 AM by: dhalen32 
James R. Davis 

Links



From Cash's Closet This is Cash's eStore from which you can purchase our book (Motorcycle Safety and Dynamics) among others and handcrafted jewelry along with other fine gifts. 


Models



Attack Angle Constant Radius Calculator If you are making a turn and encounter an obstacle, you can determine what the maximum attack angle your bike will achieve given you can determine the radius of the turn, and how far you travel in a vertical and horizontal distance from the start of the curve using this calculator. 
1 
1 
03/03/2012 6:36 PM by: James R. Davis 
James R. Davis 


Average Deceleration Rate Calculator Though not an excel model, this chart provides you the ability to directly determine the average deceleration rate during a quick stop when you have the speed traveled when braking began and the distance taken to bring the bike to a complete stop. 
1 
1 
11/24/2010 9:32 AM by: James R. Davis 
James R. Davis 


Average Deceration Rate From Max Rate and Squeeze Time Assuming that you have been practicing quick stops during your parking lot practice sessions, you have determined your average rate of deceleration during those efforts by measuring the distance needed to stop and knowing how fast you were going when you started braking. You even found out what your maximum deceleration rate was given that you could estimate your 'squeeze time'. This model will tell you your average deceleration rate at any higher starting speed given the same squeeze time and maximum deceleration rate. 
1 
1 
05/08/2012 1:26 PM by: James R. Davis 
James R. Davis 


Bike Weight by Latitude This calculator provides you the ability to determine your bike's weight given you know what it's mass is and where it's located on the earth (latitude and altitude). 
1 
1 
07/03/2012 11:11 PM by: James R. Davis 
James R. Davis 


Distance To Avoid Calculator Ever wondered how long it would take you to change lanes at a given speed, or how much distance your motorcycle would travel (how much distance you NEED) in order to swerve to the left or right a given number of feet at a particular speed, or how aggressively you need to change directions to avoid hitting something in the road? This calculator will give you the answers. 
1 
1 
03/03/2012 5:00 PM by: James R. Davis 
James R. Davis 


Effective Steering Angle Calculator The amount of rotation you provide your handlebar is not the same as the amount of turning your bike will do. That is, your steering angle is not the angle your motorcycle changes direction by. The effective steering angle is a function of your head steering angle, your rake angle, and the lean angle of the bike. This calculator will compute the effective steering angle from those inputs. 
1 
1 
03/03/2012 6:05 PM by: James R. Davis 
James R. Davis 


Impact Speed Some of the simplest models can enlighten us with solutions to difficult problems. This model can be used to determine how fast you will hit the ground and how long it will take to strike the ground given the distance fallen. Maybe more importantly, let's say a student pops her clutch with a 1/4 throttle application and she travels 40 feet before running into a concrete lamp pole. Assuming that 1/4 throttle generates an acceleration rate of 0.4g's (or whatever you wish), this model will tell you how fast she was going at the time of the crash and how long it took. 
1 
1 
04/14/2013 10:01 PM by: James R. Davis 
James R. Davis 


Kinetic Energy The energy of motion. When an object has motion, it has energy. Just how much is a function of its mass and its speed (squared). This model will quantify that energy for you. 
1 
1 
04/15/2013 12:03 AM by: James R. Davis 
James R. Davis 


Lateral Acceleration From Lean Angle Simple conversion program that translates any given lean angle into the lateral acceleration (expressed in g's) that MUST correspond. 
1 
1 
03/03/2012 5:47 PM by: James R. Davis 
James R. Davis 


Lateral Movement Constant Radius You are riding on a circular path with a constant radius. If you suddenly lost traction, your bike would travel in a straight line that is a tangent to the path you were riding. If you maintained your speed and knew how far you traveled in that straight line, how far would you be from the path you were originally traveling?
Or, while remaining on your original circular path, how far do you move laterally if you know how far you moved longitudinally?

1 
1 
03/03/2012 6:27 PM by: James R. Davis 
James R. Davis 


Lean Angle From Lateral Acceleration Simple conversion program that translates any given Lateral Acceleration (expressed in g's) into the lean angle that MUST correspond. 
1 
1 
03/03/2012 5:52 PM by: James R. Davis 
James R. Davis 


Longitudinal Movement Constant Radius This calculator will provide you the longitudinal distance traveled if you know both the lateral distance and length of radius when you are riding in a circular path at constant speed. 
1 
1 
03/03/2012 6:50 PM by: James R. Davis 
James R. Davis 


Maximum Lateral Movement Ever wondered how far you could veer to the left or right in a given distance? You would need to know how much distance you had in front of you and how aggressively you steered. This model will do the calculations for you. 
1 
1 
01/14/2012 12:26 PM by: James R. Davis 
James R. Davis 


Segment (arc) Length Calculator When traveling between two points along the circumference of a circle, given the central angle and radius of that path, this calculator will determines the actual distance traveled. 
1 
1 
03/03/2012 6:54 PM by: James R. Davis 
James R. Davis 


Squeeze Time Effect On Max Deceleration The amount of time it takes you to reach your maximum deceleration rate (your squeeze time) affects the maximum deceleration rate you must achieve in order to average a given deceleration rate. This calculator shows you exactly how much. 
1 
1 
05/02/2012 10:36 AM by: James R. Davis 
James R. Davis 


Traction Demand In order to determine whether your bike will skid or slide, you need to know what the Static Coefficient of Friction is between the tires and roadway as well as the braking and cornering forces that put a demand on traction. Since braking forces are perpendicular (orthogonal), they do not simply add  you must combine them. This simple model demonstrates these facts and gives you a close approximation of total traction demand as compared to the total available traction. 
1 
1 
05/09/2012 2:03 PM by: James R. Davis 
James R. Davis 


Trail There are two trail measurements: Ground and Mechanical(Real).
This calculator will tell you how long each is given the rake angle, offset, and wheel radius. 
1 
1 
03/03/2012 5:59 PM by: James R. Davis 
James R. Davis 


Deceleration Rate From Speed and Stopping Distance Given the starting speed and distance to stop, this model calculates the deceleration Rate employed. 
1 
1 
09/09/2010 1:36 PM by: James R. Davis 
James R. Davis 


Stopping Distance From Speed and Deceleration Rate Given the starting speed and deceleration rate, this model calculates the stopping distance. 
1 
1 
09/09/2010 1:43 PM by: James R. Davis 



Speed From Stopping Distance Calculator Used to compute how fast a vehicle is traveling at the start of a known stopping distance. It assumes that all braking is done with a constant deceleration rate (such as would generally be the case if skidding). It also allows you to include PDR (PerceptionDecisionReaction) time, if any. 
1 
1 
06/19/2008 9:58 AM by: James R. Davis 
James R. Davis 


Stopping Distance Calculator This model calculates the fastest possible nonskid stop time and distance given Speed, Grade, Coefficient of Friction, and Braking Efficiency. It also calculates the maximum decelerate rate possible given the height of the CG, length of Wheelbase, and weight distribution. 
1 
1 
02/02/2007 3:08 PM by: James R. Davis 
James R. Davis 


Speed Scrubbed During Skid It is not intuitive, but skid marks do not represent speed. Instead, they represent energy transformation. That is, they represent the amount of kinetic energy that was converted to heat. This model calculates the amount of speed that is scrubbed during a skid based on the starting speed and drag factors. 
1 
1 
12/13/2009 11:27 AM by: James R. Davis 
James R. Davis 


Critical Speed Calculator This model calculates the speed at which a vehicle will lose traction given the radius of a curve and the Coefficient of Friction of the roadway. This is usually called the 'Critical Speed'. 
1 
1 
05/27/2008 11:38 PM by: James R. Davis 
James R. Davis 


Distance traveled and Speed after braking using Decel rate This model allows you to specify your starting speed, deceleration rate, and length of braking time in order to determine how much distance was taken and what the current speed is after that braking time elapses. 
1 
2 
10/13/2010 6:04 PM by: TonicBIA 
James R. Davis 


Lateral Acceleration & Lean Calculator Given the radius of a turn and the speed of the motorcycle, this model calculates what the lateral acceleration and lean angle of the bike will be. 
1 
1 
05/27/2008 11:34 PM by: James R. Davis 
James R. Davis 


Quadratic Equation Solver Whenever you can reduce an equation so that it takes on the following standard form:
Ax^{2} + Bx + C = 0
then you can use the quadratic equation solver to solve it. Note, there are ALWAYS two correct solutions for x! 
1 
2 
05/29/2008 5:18 PM by: James R. Davis 
James R. Davis 


Radius Calculator This simple model allows you to calculate the radius of a curve given the length of a chord and its middle ordinate. 
1 
1 
05/27/2008 8:54 PM by: James R. Davis 
James R. Davis 


Skid Distance To Stop Sometimes you just want to calculate how long a skid mark will be given a starting speed, the Drag factor components, and the assumption that you come to a complete stop without falling over or colliding with something. 
1 
1 
12/13/2009 10:09 AM by: James R. Davis 
James R. Davis 


Vault Speed Calculator This model will calculate the speed an object (such as a motorcyclist) is launched at (in other words, the motorcyclist's speed at time of impact) given you know how far it is thrown, the difference in height between launch point and impact point, and the launch angle. 
1 
1 
06/18/2008 12:01 PM by: James R. Davis 
James R. Davis 


Center of Gravity Calculator This model calculates the location of your Center of Gravity given as input the measured results of lifting the rear wheel off the ground. 
1 
1 
02/02/2007 3:35 PM by: James R. Davis 
James R. Davis 


Lean Angle Calculator This Excel spreadsheet will calculate the lean angle of the CG of your bike and the lean angle of the combined rider and bike CG given nine different input specifications. Finally, it provides a graph of lateral forces divided by vertical loads based on acceleration rates (if any) so that you can estimate when traction would be lost. 
1 
1 
02/02/2007 3:43 PM by: James R. Davis 
James R. Davis 


Skid Mark Analyzer This model calculates minimum speed at the time brakes were applied given the input of skid length, Coefficient of Friction, Grade, Braking efficiency, Collision speed (if any), surface moisture (if any), and Transient Braking Time. 
1 
1 
02/02/2007 2:49 PM by: James R. Davis 
James R. Davis 


Speed by Gear Calculator This simple model calculates your motorcycle speed given the rear tire radius, final gear ratio, and engine RPM. Note that though you have to input seven values with this model, if you merely combined this model with two others (Rear Wheel Radius, and Gearing) you wouldn't need to enter anything. 
1 
1 
02/04/2007 2:23 PM by: James R. Davis 
James R. Davis 


Rear Wheel Radius Calculator This simple model converts the specification of your rear tire into the radius of the rear wheel. (This is necessary in order to convert wheel RPM into motorcycle speed.) 
1 
1 
02/03/2007 10:50 PM by: James R. Davis 
James R. Davis 


Horsepower Calculator This simple model calculates your engine's horsepower given its RPM and Torque as input. 
1 
1 
02/03/2007 11:26 AM by: James R. Davis 
James R. Davis 


Gearing Calculator This model computes the final gear and final drive ratios given the gear tooth counts for Primary Drive, 1st through 6th, and Final Drive as input. 
1 
1 
02/03/2007 11:18 AM by: James R. Davis 
James R. Davis 


Drag and Lift Calculator This model calculates the weight on the front and rear tires resulting from virtually all variables that could affect them in a dynamic state. In particular, you will provide static state configuration information then add such variables as Latitude, Altitude, Wind speed, and Temperature. 
1 
1 
02/02/2007 3:20 PM by: James R. Davis 
James R. Davis 

Statistics 

3,004 of 5,785 (51%) Members have made 126,486 posts in 93 forums, with the last post on 08/03/2020 6:31 AM by: James R. Davis. 
Posting members who have Mentor = 57 (1%), POSITIVE Karma = 428 (14%), NEGATIVE Karma = 57 (1%) 
Posting members who have provided Peer Review votes = 367. Voting mostly POSITIVE = 320. Voting mostly NEGATIVE = 32 
There are currently 12,924 topics. 
There are 114 polls (0 now open) and there were 16,375 ballots received. 
Please welcome our newest member: birkbill. 
Birthdays 

lucie (August 10), BOOMER (August 10), Ace Man (August 10), whateverwhatever (August 10), twenty8 (August 10), modernmom (August 10), Kalixadam77 (August 10), free1954 (August 10), JohnHardesty (August 10), MasterGuns (August 10).

Upcoming: Glow811 (Aug 11), terry (Aug 11), Mike Devenport (Aug 11), royspassenger (Aug 11), dzombek (Aug 11), narmer2000 (Aug 11), quetzalcoatl04 (Aug 11), katiebug (Aug 11), 2obrut (Aug 11), Cruiser35 (Aug 12), Linkeroo (Aug 12), joecap (Aug 12), clyney (Aug 12), monica64 (Aug 12), OMAN (Aug 12), Davicho (Aug 12), Proggy (Aug 12), Geechee (Aug 12), Strolr (Aug 12), Dickes4 (Aug 12), Steam.Airman (Aug 12), noah.c.hardy (Aug 12), Billy Rosewarne (Aug 12), DRAGONLADEE56 (Aug 13), whistler (Aug 13), sammyj (Aug 13), roadking (Aug 13), mominriaz (Aug 13), DavidB (Aug 13), Trailmaster (Aug 13), BENG (Aug 13), Erronous Monk (Aug 13), mikejr (Aug 14), spike (Aug 14), Hetkey (Aug 14), eliminatethis (Aug 14), J.J.Central (Aug 14), sgtbilldoor (Aug 14), synthnut (Aug 14), Trevor (Aug 14), Valiant (Aug 14), dpdixon (Aug 14), driftguy (Aug 14), Davidators (Aug 14), dhortho1 (Aug 14), Southpaw80 (Aug 14), Scott (Aug 15), mb289 (Aug 15), Derek Ryan (Aug 15), Shadyrider (Aug 15), jbarnes (Aug 15), faizi4u (Aug 15), windsor (Aug 16), Simmons (Aug 16), pbelanger (Aug 16), Nufie Bullet (Aug 16), Steel Steed Rider Coach (Aug 16), JMartin (Aug 16), rsol (Aug 16), thablacksheep (Aug 16), Martin (Aug 16), va_scubadiver (Aug 16), marshad_786 (Aug 16), The_Raven (Aug 17), Juicyjes (Aug 17), algogocom (Aug 17), sandiegorider007 (Aug 17), mxstar12 (Aug 17), Old Kaw Boy (Aug 17), saltot (Aug 17). 
Recent: Mikea (August 3), Tony Harris (August 3), ravnhaus (August 3), rk1981 (August 3), boulder76 (August 3), majec5 (August 3), jameselgringo (August 3), white wolf (August 3), Adam H (August 3), MaxMan (August 3), Forbussr (August 3), wimberleydof (August 3), chromedome195 (August 3), digger58 (August 4), Gramps2 (August 4), Frenchfry (August 4), bonnieprincebilly (August 4), mountainman (August 4), SecaRob (August 4), knappyman (August 4), TSGM (August 4), dfenwick (August 5), mcatrophy (August 5), Avatarhands (August 6), fatman819 (August 6), mamm (August 6), KZeeRider (August 6), WSMeders (August 6), Piranha (August 6), bkelly@bkellyusa.com (August 6), monant (August 7), MOTH (August 7), nightwing1983 (August 7), nightwing83 (August 7), thebells4 (August 7), jmort253 (August 7), mule (August 7), garybuscc (August 7), chainmaker (August 7), broo (August 8), Sirius (August 8), stevieg (August 8), BillWxFL (August 8), greg8872 (August 8), Robb (August 8), WerxRacing (August 8), RussPeters (August 8), stratojim (August 8), pianoman8849 (August 8), CorbinD (August 8), chad (August 8), graemerbeggs (August 9), grb1944 (August 9), bxrdoc (August 9), Josh175 (August 9), rufuss (August 9), phrase47 (August 9), speedkills (August 9), RAPCSD1 (August 9), harley777 (August 9), Jester700 (August 9), Roadie (August 9), shadow2003 (August 9), joemwm (August 9). 