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That's a great looking and clean chassis! Only thing I don't totally understand is why you go dead axle instead of live with the chain on the opposite side? Not really a critique just wondering what the decision making process was.
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Some of the reasons:
-standard axles. we use chromoly tube to form the dead axles.....simply cut to length. this reduces machining.
-we use AM standard wheels. the plaction variety is cheaper than the performance wheel....so using a dead axle saves us having to add AM hex or key hubs back into the wheel, thus increasing the cost.
-we can service the wheels just as easy as any live axle setup i've seen. when the chain is tensioned properly it slides off the axle with the wheel as part of the assembly...no issues.
-dead axle blocks are slightly easier to manufacture....just ream an undersized hole for the axle. no precise bearing fit.
-chain on the outside of the frame rail doesn't interfere with any assembly on the inside....this makes life easier when we have to add something unplanned inside the perimeter
-we can adjust the rocker by swapping out different end blocks. live axle blocks don't allow this because there isn't enough material to machine away in the vertical direction.
-we used to use custom Dewalt planetary drive transmission....they wouldn't have worked well with a double sprocket on the inside of the chassis rail.
Note that the Super Light Chassis product can be used in either variety. The standard version is "dead" axle, but "live" axle blocks can be dropped into the outer wheel positions.