how does rake affect handling

It is indeed a very important factor that maintains the stability of the ships when in the high sea. -- If your rear axle steers towards the outside of the race track during chassis roll (loose steer), a lowered panhard bar (which … The Offset decides the rake angle and trail of a motorcycle. More mast rake might equal better pointing upwind, but heavy mast rake kills down wind performance. Some 4x4s require slightly more lift than others to get a level stance. Changing the rake by modifying the frame, the triple-tree or both can make dramatic changes in the trail and, therefore, in the bike's handling. I think when they went to the fat forks they all have 29 deg. Enormously weighty and in-depth books have been written on motorcycle geometry, a subject that scares and confuses even some professionals, but we are … The less trail we have gives us very responsive low speed handling at the penalty of twitchy higher speed response. Does anyone have any more ideas I can try, or is this an incurable issue on … It's counter intuitive - slacker head tube angles need more rake to produce the same trail. – heltonbiker Oct 19 '12 at 14:14 Different vehicle models have different amounts of rake in the stance. Most leveling kits provide 1-2.5 inches of lift. I like the raked look, but don't know how it might affect my handling. Note: Trail cannot be a negative number as this will adversely affect handling unless you are building a shopping cart. Also how does changing the height in the rear to get more or less rake affect handling compared to just changing the rake … However he always feels it is short on power and to this end we have run several engines in it over the last 3 years. Asking for help, clarification, or responding to other answers. Now that you know how to use a carpet rake, you probably agree with how simple the process is. More rake makes for quicker handling, which again will tend to cancel the slower handling caused by the shallower head angle. The 650b bike is two degrees slacker at 65.5-degree and … These include tube angles, dimensions, fork rake, bottom bracket height and centre of gravity. So reducing body roll even 100 percent would have very little effect on weight transfer. These … A close friend of mine purchased a new Tri Glide last year. 2) Does the kit specify a different lift height for the front and rear? Posted 6 years ago. Fork offset, combined with head angle, affects something called ‘trail’, and ultimately whether it’s a dog or a whippet on cdertain descents, thus explains bike fettler extraordinaire Chris Porter from Mojo. Truth is, it can be used on pretty much every surface to pick up dirt, hair, etc. By lowering the front end, you are manipulating the bike’s rake and trail settings. Handling improvements might not be as glamorous as big power figures – and they won’t give you a handy … Thanks for contributing an answer to Stack Overflow! Size. Or perhaps your bike is a little too quick handling already, and slacking off the head angle would slow the handling … The three fork crowns used in our experiment – giving 51mm, 44mm an 37mm offset respectively. Factors Affecting Motorcycle Handling. The front wheel has a castor with a vertical steering axis in front of the wheel. Some manufacturers replace the drop dimension with “Bottom Bracket Rise”, which conversely measures from the ground to the center … Just remember, trail and rake have an inverse relationship. These include; accelerating, braking, cornering, power to weight ratio and fuel economy. This post is not about the wheel design choice – all manufacturers offer a wide selection – but about preventing any handling side effects due to a taller size than stock. Though originally restricted to mast rake and weather helm, the discussion has been expanded to include information on tuning the boats. All other FXD type bikes have 28°. Looking into a 7deg rake (Mortons) for my 2013 Jackpot, seems a big debate over geometry/trail & handling, I have a 21" front wheel now & am of the understanding moving the front wheel 6" forward would be within the allowable trail to not affect handling/ corners, some conflicting information suggesting I would need 23" or 26' to maintain proper handling, yet I see allot of pictures … With a bigger wheel size, there is more trail, since the axle is higher, creating more distance between the contact patch and steering axis. The angle between the two lines is referred to as the rake or rake angle. This is true up to a certain point. Some Other Factors. The information below is taken from e-mails from Keith Diehl's Montgomery Boats Listserver. For chassis that have been raked to 40 degrees or more, and too much trail is present, Raked Triple Trees are necessary. Some manufacturers replace the drop dimension with “Bottom Bracket Rise”, which conversely measures from the ground to the center of the bottom bracket. The amount of lift a leveling kit provides is typically dictated by the vehicle model that is being leveled. He's got to build the loads and let them go constantly. The FXDL & FXDWG both have 32° rake built into the frame. The simple answer is that head tube angle is one of the two factors that determines trail, and trail will affect handling slightly. Carpet rake, by name, sounds as if it is just associated with carpets. Fork offset, combined with head angle, affects something called ‘trail’, and ultimately whether it’s a dog or a whippet on cdertain descents, thus explains bike fettler extraordinaire Chris Porter from Mojo. Your stem length also plays a role as shorter stems steer slower. Rake-and-Trail. Bottom Bracket Drop: This dimension is the height difference between the center of the bottom bracket/crank and the center of the dropouts (where the wheel’s axle connects to the frame/fork). The watts linkage has very little to do with how rake affects the car. But avoid …. We hope now you have a better idea on the subject. I've never heard of people adjusting cornerweights to cure understeer or oversteer. I'm no expert, but I wouldn't want to mess w/ that too much sin... These include tube angles, dimensions, fork rake, bottom bracket height and centre of gravity. Head angles affect bike handling in a few key ways. Extending the forks will change front ride height, which affects trail, but not going to get you back to the original numbers, unless you started to raise the rear ride height (as in a sportbike) lowering the trail numbers again. The idea of this article was to give you a general idea on what are ship trim and its effect on ship stability. Handlebar width on road bikes is measured either 'centre to centre' and referred to as 'C-C' or 'outside to outside' and referred to as 'O-O'. Imagine a leg, say, ten metres long, hanging down underneath your boat, with a prop on it.

When you accelerate, the prop tries to drive your boat forward, but because it is a screw, it also tries to swing the leg sideways. Thanks for contributing an answer to Stack Overflow! It plays a crucial part in the handling characteristics of a bike, and it is usually regarded that the responsiveness of a bike’s handling is inversely reacting to the rake angle values. Motorcycle handling is a complex equation, and it involves geometry and weight distribution, alongside the good-old balance and actually learning how to ride. It is indeed a very important factor that maintains the stability of the ships when in the high sea. An example of caster in action is the front wheels on a shopping cart. We know that changing rake and trail affect how a bike handles. Hopefully by now you can see how rake and trail are interconnected, as rake automatically has an effect on trail – less rake means less trail, and vice versa. The simplest explanation of the effect that rake and trail have on handling can be explained by imagining a castor wheel on the front of a shopping cart. March 20, 2017. by Martin Krönke. 5.5: Ride Heights basics. First of all, we must understand that the carrying of extra weight will affect the whole dynamic characteristics of your car. These include; accelerating, braking, cornering, power to weight ratio and fuel economy. For chassis that have been raked to 40 degrees or more, and too much trail is present, Raked Triple Trees are necessary. Stem length is intertwined with how head angle and fork rake affects bike handling – it has become a key ingredient in modern mountain bike design. Posted on March 20, 2017. First, you should know that the Bagger chassis don’t like very much extra rake. WHAT EFFECT DOES TRAIL HAVE ON A BIKE? Different vehicle models have different amounts of rake in the stance. Thinking about getting BMR 1"/1.4" drop springs. rake. Posted 6 years ago. Viewing 13 posts - 1 through 13 (of 13 total) The topic ‘Fork length and offset and their effect on handling. Handlebar Width. Increasing fork tube length will increase rake and trail, but a front end lowering kit by itself will decrease it. The Ultimate Handling Guide Part VIII: Understanding Your Caster, King Pin Inclination and Scrub By Mike Kojima Understanding what caster does and how to use it is a powerful tool in the box of a suspension tuner. The smaller the rake angle, therefore, the more agile a bike will be. Posted on March 20, 2017. I'm certainly no expert here, but I would guess that ideal rake/ride height is particular to each car, and is determined through testing. Fortunate... It is normally accepted that the responsiveness of a motorcycle’s handling is inversely corresponding to the rake angle values. At this time, the bike is being flipped rapidly from side to side, and if it has a large trail, it will wobble as it does so because the front wheel will turn with the lean. Most Harley® riders make changes in their bikes rake without realizing it. rake. Looking into a 7deg rake (Mortons) for my 2013 Jackpot, seems a big debate over geometry/trail & handling, I have a 21" front wheel now & am of the understanding moving the front wheel 6" forward would be within the allowable trail to not affect handling/ corners, some conflicting information suggesting I would need 23" or 26' to maintain proper handling… Given the importance of steering, it shouldn’t be surprising that the geometry of the front end of a bike has the biggest impact on its handling. Because the steering axis is vertical, the wheel has no rake and My experiment confirms this but I don't know whether it is caused by toe-in changes or higher CG <-> more weight transfer. If it is the toe-i... WHAT EFFECT DOES TRAIL HAVE ON A BIKE? I think when they went to the fat forks they all have 29 deg. Static ride height is one of the key setup adjustments, and also one of the easiest to get right. Anyone with before and after experience on the track with a raked suspension? We know that changing rake and trail affect how a bike handles. Enormously weighty and in-depth books have been written on motorcycle geometry, a subject that scares and confuses even some professionals, but we are going to bring it down to a very basic level. ... HOW CAN THE WIDTH OF HANDLEBARS AFFECT HANDLING? Read any of our bike reviews and you’ll notice we bang on a lot about frame geometry. Benefits of a carpet rake. I think I'll get a steering damper to be of the safe side. A steep head angle is more upright and takes less effort to turn the front wheel, especially if there is too much rake or too little trail. The Offset decides the rake angle and trail of a … 2) Does the kit specify a different lift height for the front and rear? I am experimenting with Coilover rake and height adjustment and noticing its effect on turn-in understeer. This is true up to a certain point. This angle is extremely sensitive, even a few milimeters one way or the other, either on the front or rear end of the car can have a significant effect on downforce. (Paul Epstein+, Sept 2005) How to use the doubling cube (Michael J. Zehr, Nov 1993) Liveliness of the cube (Kit Woolsey, Apr 1997) PRAT--Position, Race, and Threats (Alan Webb, Feb 2001) Playing your opponent (Morris … Simply raising the spring rate can rapidly deteriorate not only a vehicle’s comfort, but its handling and grip as well. For example, an F1 car has positive rake, for maximum downforce, while a truck has negative rake.. Let's say that we had two identical cars, one set up with positive rake, and the other with negative rake.