>>1542468What engineering abomination is this?
Why would you bother with cogs and a chain?
If you're going to make something that heavy and complex, why not use two sets of spur gears, and two idler gears between them to do the same thing a chain would do without the weak link that a chain represents?
Then since you're apparently not concerned with weight, enclose the whole thing completely so the spur gears and bearings can all run in gear oil and essentially never, ever wear out.
Then dispense with the output chainring and drive chain, use a couple right-angle drives and a driveshaft to link it to the rear wheel, making the entire drivetrain end-to-end maintenance-free. Who cares if your bike weighs 50 pounds, right?
LOL.
You may as well just have shaft drive from the cranks to the rear wheel and an internally-geared hub. Design the frameset so the right-angle drive for the cranks are integrated into the bottom bracket, Circular seals on everything to make it weatherproof and essentially maintenance-free. Now you have the perfect filthy-casuals' city bike.
