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Cross over drive so that we can get a gear ratios big enough.
64t on the front, that drives a 15t which drives a 58t on the opposite side of the bottom bracket. That then drives a 13t on the rear wheel.
Would be the same as having a 245t x 14t on a standard bike... about 460 inch gear in old money.
We can increase that gear by changing the combination, some this line there for instance:
68t x 14t x 64t x 13t would give an even bigger gear of about 580 inch which would be needed for World Record speed. That's something like 255t x 12t on a normal road bike.
adman
Drano
What's happening at the drivetrain? Is that a double chain?