Index of mounting the rear shock outside the triangle

[spinningmagnets]

Having a full-suspension frame and also having the frame triangle open to hold a large battery in a central location is of interest to E-bikers. I'm starting this thread so I won't have to ask permission to edit the first post when I find examples. Some of these examples will be available to be purchased now, and some will only be available as a used frame. My interest is in a discussion about the various merits of the different methods for custom frame building.
First is the Addaptto Raketa

http://adaptto.com/Services-for-OEM/Raketa-Project/



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Zlatko in Croatia is producing the "CBM" which has two rear suspension options, this one is similar to the Britten motorcycle. The vertical rod behind the shock pulls down, and the bottom of the shock is stationary.





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Here's the Specialized S-Works from around 2007-ish

View attachment 5


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the Rusty Spokes Softcruiser. You could use a longer shock if the bottom mount was welded under the swingarm, and the upper mount was mounted as high as possible.


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The Vector frame has dual shocks as an option for their heavier clients (bike shown is not a Vector)

View attachment 1

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Some stand-up "kick scooters" have a rear suspension like this. I don't know the proper name (pull-shock? tension shock?). Of course the one shown does not have proper dampening or any rebound adjustments, but...



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[spinningmagnets]

I don't know anything about the Tularis, but here's a pic

from the web "...Dr. Robin Tuluie lives in Minneapolis and works at MTS...The bike is fitted with a two-stroke, 772cc parallel-twin (taken off a Polaris snowmobile!) that produces a massive 183 horsepower at 8,700rpm..."

Here's the Britten motorcycle, with a vertical rear shock is inbetween the front of the engine and the front wheel, similar to Zlatkos CBM above...on both, the boittom of the shock is stationary and attached to the frame, the top compresses downwards. A motorcycle blog indicated that on the Britten, the rear tire and wheel were made as light as possible, and the swingarm was carbon-fiber for the same reason. Moving the shock to the front was an effort to move whatever weight and mass they could farther forward. The "three link" connection seems excessive, and for a bicycle it probably is, although, on the Britten, the entire linkage was likely to be very light (Magnesium/Titanium/etc). Useful for discussion, but the Raketa is far better for our purposes concerning simplicity of construction and cost.

 

[spinningmagnets]

reserved (20 pic limit per post)

 

[MadRhino]

It is so much easier to fit batteries to an ebike when the shock and suspension linkage are not in the way. Yet, "creative" suspension design is a good way to alter the natural response and damping of a bike's tail, I'd say: most of the time. When it's good, you soon find it has to be heavier, or you had to compromise the balance with geometry mods.

Make it simple, and push the shock in the direction you want the bike to react when suspension tops out and bottoms down. Well, not so many are frequently pushing a bike to top and bottom, yet it does happen to every rider sometimes, or some day...

Rear suspension design is for a big part in how a bike is handling and holding. Make it able to best evade or take a hit, like you don't ride a bucking horse either dressage or cross country.