Im looking to go 80 mph and I got 100 dollars to work with

I would offer this to go 80 mph with $100 to work with...
Buy a $100 helmet, take your bike to the steepest, highest mountain top, and with the helmet strapped on tight...shove off downhill.

I'm sure you're not serious about this...neither is my advice.

If you really want to 80 mph on 2 wheels do what I did... buy a 700cc motorcycle. Going that fast you need a little weight under you and decent suspension at a minimum.

OR.. go see Travis Pastrana
He’ll figure out how to do it.

 
Get a used predator 212 off marketplace or Craigslist to start with. I'd weld in a mount plate to a sturdy frame. That will get you started, but I'm not sure how a good drive train can be accomplished with that budget. To get the gearing to go that fast you will definitely need it to start from a stop with pedal assistance.
 
Bicycles were never built with those speeds in mind and its basically a fools errand to even think that any bicycle would stand up to it.

This is about the only outcome I can think of for your little quest of 80 MPH on a bicycle.

240_F_231277057_1mguix9kCnsD2E31EH1q1ZVH6GcRhUtZ.jpg


And with only @100.00 to spend???...Quite impossible...lol.
 
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