Dog bone length

[ribbert]

It's important to note that the failure of the Soupy dog bone was a single bone used of a R-1 swing arm conversion.

My take on the failure is not so much on a badly engineered dog bone, but as on that particular bike, only one dog bone was being used. These are engineered and intended to be used as a pair.

Fred

Isn't that effectively what you have when they are not dead even, all the load on a single dog bone? With hardened steel shafts, roller bearings and short lengths there is no where to take up slack, any slack, without loading up the parts beyond their design limits.

Noel

[ribbert]

*centered

**centred

[ZOA NOM]

*centered

**centred

Touche' 

[ribbert]

It's important to note that the failure of the Soupy dog bone was a single bone used of a R-1 swing arm conversion.

My take on the failure is not so much on a badly engineered dog bone, but as on that particular bike, only one dog bone was being used. These are engineered and intended to be used as a pair.

Fred

Isn't that effectively what you have when they are not dead even, all the load on a single dog bone? With hardened steel shafts, roller bearings and short lengths there is no where to take up slack, any slack, without loading up the parts beyond their design limits.

Noel

Yes, you're right, I was thinking the exact same thing.

[racerrad8]

Ron,

I assure you the sag we set the bike at was the recommended 1.5-2" as recommended when you installed the RPM shock. Now. I know you have been doing a lot of traveling with a significant amount of luggage and we might need to adjust accordingly for that.

That additional weight also might require the heavier spring to be installed.

Secondly, it might be time to mark the inner fender with white paint pen marker and see if the tire is rubbing or just residual from the broken lower shock pivot bolt.

Finally, I stick with my earlier statements regarding raising the rear of the motorcycle. As I have mentioned prior during the testing and design and working with Ricor, the shock manufacturer who makes the RPM shock, the relay arm needs to stay as close to the stock position as possible. If the shock is lengthened, then the relay arm is pushed down out of its moment of center position and changes the spring rate by the rising rate GW talks about. The only way this can be accomplished is by modifying the dog bone length to change the ride height.

Here is a couple of pictures I have referred to in the past that shows the significant misalignment of the relay arm in a downward position. This is a major change of swing arm linkage due to a longer shock, but is illustrates it perfectly.





Randy - RPM