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Conventional vs Reverse Trike Discussion

BajaRon

Well-known member
We get inquiries about exactly what the advantages and disadvantages of the two basic trike configurations are. Not to bash anyone's ride. Especially the Goldwing and Harley versions, as I know there is a large fan base with many who love them.

But I can assure you that physics has no dog in this race. It has no brand loyalty or preference. It doesn't get emotional or care when you are approaching a sharp blind turn or someone pulls out infront of you.

Nor will I attempt to cover all the variables from from power plant to electronics and accessories. Acknowledging there is much more to your ride than the platform. However, the platform is where most people start, and for good reasons. If the platform is wrong, all the bells and whistles in the world are not going to fix it for you.

Physics, in this case, determines, among other things, overall vehicle stability and handling. Suspension components and rider skills can extend the capabilities of any vehicle. But apples to apples, there can be no debate. The reverse trike has some unbeatable advantages.

Trike-Honda.png Trike-Reverse.png

Everyone should know by now that you can lift the wheel on either design, though there is a definite difference between lifting a straight axle (conventional) and an independent suspension setup (Reverse). An unexpected wheel lift on the latter is generally less abrupt, more controllable, and less serious. Of course, if you never ride in such a way as to lift a wheel, this aspect may not matter to you. However, riders forced to perform an evasive manuver will appreciate the difference.

Both designs are pretty good at straight ahead handling. Neither are likely to give the rider any issues when all is going well and there are no additional requirements placed on the vehicle. But add some variables, and the differences become apparent.

In a turn, the major force is at an angle to the turn. Newton's First Law of Motion (Inertial Force) makes everything want to continue in a straight line. But you want to modify that (going around a corner, etc.) So, you turn the handlebars which turns the wheel(s) depending on what you are riding. Now you are asking your ride to defy Newton's law, which is doable, but there are some inescapable demands. In the end, it is physics that decides who gets their way.

In our case, this is based largely on 2 factors. Both having to do with the vehicle's ability to effectively and safely resist Mr. Newton's law.

First is the platform design. As you can see in the diagram's below, the reverse platform trike has a great advantage here. It is the difference between someone trying to push you to the side while standing on 1 leg or 2. (And no, you don't get to hop!) It's no contest. Add some braking during your turn and the reverse trike advantage increases exponentially.

The conventional trike's rear wheels do help to resist this sideways pressure. But they are at a great disadvantage being placed at the back of the vehicle and away from ideal positioning. The Reverse Trike's front wheels act as outriggers, they offer stability that the conventional trike cannot.
Trike-Conventional.jpg Trike-Reverse1.png

The next issue has to do with what is called the 'Contact Patch'. Which is the amount of rubber that is in contact with the road surface. Since it is the front tire(s) which are given the task of challenging Newton's Law. The amount of footprint makes a good bit of difference in how successful the change of direction will be. The greater the demand, the more important this factor is.

The typical conventional trike has a contact patch of around 4-5 square inches. A single Can-Am Spyder front tire has about 18 square inches in contact with the pavement, and there are 2 of them. 36 square inches compared to 5 square inches is huge in the battle with the laws of physics in a turn. Even if you do end up lifting a wheel, you still have over 3 times the contact patch of a conventional trike.

It all adds up to an end result. But no matter what you ride, know its limitations, and yours. It's all about the ryde!
 
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I appreciate Ron's explanation of the physics between the two designs and this is only one opinion and my two cents and worth about half that. This last trip, was the first time I had a wheel come off the ground on my RT. I went into a corner too hot, likely too much weight on the bike, I was not paying as much attention as I normally do, was momentarily distracted and riding two up. System started braking, both of us said "whoa" in the Cardo, wheel touched down and all was well. When I went to the trike, so I could stay on the road, the Spyder was my last choice and distant at that. After the three wheel training course you have to go through in Washington, it was the first choice. Not for my own personal safety, but for for the people who would trust me to get on behind me. When I saw and felt how easy it was to get one of those others up on two wheels (in fact, you have to in order to pass the course) versus the overall stability and safety features of the Spyder, it just kept moving the sticks on me. IMHO, the HD and GW trikes are spectacular. Some are just downright beautiful to look at, sit on and ride. No matter what I do to mine, it's still the ugly duck in terms of looks when I ride with my friends, but in terms of safety and overall handling in a trike configuration... I think we are sitting on the best framework and that is something BRB got right.
 
After getting used to the tiller steering of a Spyder over the counter steering of a motorcycle, within the Spyder's limits it feels planted and stable, even two up.

I took a test ride on a Harley trike, a new one with the independent rear suspension. Trying to ride at normal Spyder speeds it scared the living daylights out of me. I'm sure if you had never ridden a Spyder, then riding within the limits of the Harley trike would seem normal, but to me it seemed that corner entry was off putting, especially on decreasing radius corners.

Could you get used to a forward trike, I'm sure you could, but for me the Spyder is so much more stable when the roads get twisty.

The only thing I could say was that the Harley's build quality was superb. The paint and bodywork was much better considering the closeness in price to my 2026 Sea to Sky. The overall fit and finish was definitely superior. The Spyder's bodywork and paint, especially for my white satin finish, seems a little cheap compared with the deep gloss finish on the Harley. That's somewhere Can Am could up their game.
 
AI Overview


1788566745892.jpeg
A historical engineering study conducted for the U.S. government by the Calspan Corporation in 1972 concluded that standard children's tricycles were unstable and unsafe because poor design caused them to roll over and pitch backward during normal use. [1]

Study Findings and Context
    • The 1972 Calspan Report: Researchers found that traditional tricycle designs lacked stability, leading the Health, Education, and Welfare Department's Bureau of Product Safety to initiate mandatory design and performance standards. [1]
    • Injury Statistics: At the time of the government study, standard tricycles were linked to an estimated 100,000 to 130,000 injuries per year in the United States. [1]
    • Mechanics of Tipping: Sudden turns of the front wheel often caused riders to fall or tip over, exacerbated by young children having proportionally larger heads that increased the torque applied during sudden movements. [1]
    Modern Safety Data
      • Emergency Room Visits: A later analysis published in the journal Pediatrics noted that more than 9,000 children were treated in U.S. emergency rooms for tricycle-related injuries across 2012 and 2013. [1]
      • Common Injuries: Two-year-olds account for the most frequent injuries, with cuts, gashes, and head trauma representing the majority of cases. [1]
      • Safety Recommendations: The American Academy of Pediatrics advises that most children do not possess the balance or coordination required to safely ride a tricycle until around three years of age, recommending designs that are low to the ground with wide wheels. [1]


    Modern Safety Data
      • Emergency Room Visits: A later analysis published in the journal Pediatrics noted that more than 9,000 children were treated in U.S. emergency rooms for tricycle-related injuries across 2012 and 2013. [1]
      • Common Injuries: Two-year-olds account for the most frequent injuries, with cuts, gashes, and head trauma representing the majority of cases. [1]
      • Safety Recommendations: The American Academy of Pediatrics advises that most children do not possess the balance or coordination required to safely ride a tricycle until around three years of age, recommending designs that are low to the ground with wide wheels. [1]






    Most of us knew this growing up!



 
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AI Overview


View attachment 256736
A historical engineering study conducted for the U.S. government by the Calspan Corporation in 1972 concluded that standard children's tricycles were unstable and unsafe because poor design caused them to roll over and pitch backward during normal use. [1]

Most of us knew this growing up!
You got that right! Didn't take very long either. You don't have to go to college to know when something doesn't work!
 
I rode Harleys for years, so when it came time to go to a trike, there was no decision. It would be a Harley TriGlde (2016). It got me by for a few years, but just barely. My wife said she felt like a bobble-head back there. The solid axle pitched her from side to side on bumps. The steering was very heavy for me, and it was totally underpowered. Like others have said, the quality was excellent. The only things I liked better on the HD over my Spyder was the luggage space and a handbrake. But I have learned to get by with what the Spyder provides. I have never ridden an HD with independent suspension or the bigger motor, but I can't see me ever going back the Harley.
 
Oh my goodness. Something like this makes sense. The next door
neighbor said he would love to come and cut my grass. Very interesting
on this idea by the way. (y)
 
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