Outboard vs Onboard vs In tube Chain/Belt

Cool design. Any issues with slippage when pushing and such?

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You can also use the Versablocks for CIT in this same design with really no need for precision manufacturing.


no sir. Never even had to replace any belts.

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Something to think about is how you are going to mount your superstructure. If your a team like us and you don’t have access to fancy sheet metal bending techniques or welding then this may drive your decision making process.

Chain in Tube:
You need to look at how the chain will interface with rivets/nuts/bolts. In many cases, the chain and the rivet tail or bolt tail want to exist in the same space. This is easy enough if you are willing to do 2 rows of holes along the top face, but it is quite a burden if you are trying to stay in the Vex Ecosystem.

Chain Inboard:
Depending on the size of the sprocket, this can have interactions with the belly pan/brain pan and make the chassis less stiff

Chain outboard:
This increases the cantilever distance to your wheels. If you expect large shock impacts and you refuse to put compliance in your system you may notice an effect. It also makes your drive rails narrower and leaves you less room for activities. This may or may not be a problem for you.

Other thoughts:
There are times and reasons to mix them. Don’t feel like you should be locked into one way of doing things. I recommend making a few CAD models of the chassis with different configurations. you will find what you do and don’t like. This may be a very personal decision to you and your team based on your resources.



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