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John’s Leaner Sidecar Combination – Homemade Project

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

Specs:


Bike Make/Model


2011 Triumph Rocket

 

Make/Model and Details of Sidecar Tub – Fibreglass, Aluminum (aluminium) Wrapped, Steel Sheet Wrapped etc


1975 Spirit Eagle Fibreglass Side Car

 

Sidecar Tub Design – Tandem/Single


Single Passenger

 

Sidecar Frame Type and Measurements – (Square/Round Tubing, Aluminium/Steel)


Round Steel Tubing

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

 

Rear Mount Ground Clearance Measurement


 

Front Mount Ground Clearance Measurement


 

Motorcycle Sub-chassis Details (Square/Round Steel Tubing, Aluminum etc) and Attachment to Motorcycle (High Tensile steel, lock nuts etc)


Custom Sub-chassis

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

 

Total Width of Combination Lean-in


 

Total Width of Combination Lean-out


 

Distance Between Sidecar and Bike


 

Sidecar Tire (tyre) Speed, Weight Rating


 

Sidecar Rim Details, Diameter, Rim Width etc


 

Suspension Type (Shock Absorber/Swing arm/Torsion) on Sidecar Wheel


Swing Arm Coilover Spring Shock Absorber

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

 

Pivot Attachment to Motorcycle, (Rose Bush, Heim Joint, Rod End etc)


Heim Joint Rod Ends

 

Sidecar Brake Details (if fitted), Drum/Disc, Plumbed to Motorcycle Rear or Front Brake Cylinder


 

Modifications/Adjustments During the Build


 

Photos of the End Product


 

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

I wonder who is enjoying the ride more?

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

1975 Spirit Eagle Leaner Side Car with 2011 Triumph Rocket

What an amazing build.

Most leaners have the pivot mounts on the bikes centreline, your’s however appears to be off set toward the sidecar.

Perhaps you could write something for your page, to explain why you chose this, how it rides, whether this causes issues or performs well.

Anyway, amazing job and I can’t wait for some measurements, tube size, extra details etc. Have an amazing day. Dave

 

Hi Dave, yes I figured the non central line installation would raise an eyebrow.

But, from an engineering standpoint, if you follow the force vectors that apply from the sidecar to the motorcycle, the slight offset is relatively insignificant.

The majority of load is a huge moment/twist that pushes the rear tire to the left and pulls the front wheel to the right. That would be true for any sidecar. The real issue is the amount of lean that the Pivot Point has, so the lower the pivot points are to the ground, the better. I offset the front pivot mount further outboard than the rear pivot mount.

I don’t think that is a significant issue, though it does tend, theoretically, to toe in as the sidecar moves up and down over bumps, independent of the bike. I found no problems driving it.

I think the bigger concern is the frame and the attachment points, and whether the frame can handle the load. So it is more important to find the best way to transfer the load to the frame in the bike then it is to worry about getting in the Centerline of the bike.

Again remember the primary load is the big dead weight hanging off the right hand side of the bike: doesn’t matter where you attach it, the force vectors are the same. So I’ll be happy to draw up some diagrams about what I did.

I think the biggest issue I’m having with this ride is that the sidecar is designed for a much smaller bike and in order for me to connect it, I had to have the sidecar wheel further in front of the rear wheel than is optimal. That translates to more  side load on the front wheel, especially when going slow with a load. I bet I could not resolve the geometry on the frame without significant modifications, which I did not want to do. But that is what you get with a 40 year old sidecar.

I know that’s a lot of explanation and I’ll be happy to type it up in a more cohesive fashion later. Thought you would like to hear my ramblings.

Also, really cool project page! Thank you so much. John

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Haul N Ride website was created to explore Innovation and Human Creativity with a focus on Interesting, Rare and Unusual Motorcycles and Accessories. Haul N Ride welcomes the sharing of projects and ideas, creating an enjoyable and educational online resource. We like to hear from readers so please leave a comment below and let us know if this post helped you or if you have any questions.

Thank you for visiting Haul N Ride. Dave

 

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