I regularly do 40' gaps on my rigid single speed without any issue. For BIG gaps I use my 5" trail bike. I've made 50' gaps with 30' deep holes under them filled with pungi sticks, sharks, and electric eels... it's easy if you know what your doing.
on topic though, i have to do a 60 ft gap over a mote/moat filled dog feces and razor blades just to get up my driveway. i routinely jump it with my rigid ss 29er, my road bike, and my 88 toyota pickup with groceries in the bed.
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