pic: 499_Toltech_drivetrain

[=Martin=Taylor=]

Originally Posted by Andrew Schuetze

Yes, Al sprockets and #35 chain. What is missing is the stand-offs for mounting the bumpers.

thanks for the kudos, I am a bit worried as weight estimates come in at 45 pounds once chain & sprockets, Dual Cims, front and rear bumpers are added to this design. I like the adjustability of the 8020 but is sure adds on the pounds.

According to Inventor 1 foot of 8020-1020 is 0.9289 lbs. and 1 foot of 1x2 1/8" wall extrusion is 0.8077 lbs. In otherwords if you replaced your two 8020 rails with boxed extrusion you would save 0.748 lbs. Big deal.

#35 chain and sprockets are however a major source of weight. In a system with such easy tensioning there is no reason to not use #25. #35 should only be used when you don't want to have a tensioning system, or when (like on arms) there is a significant amount of twisting and the length of the chain has to be very long.