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[MV]

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[Sava]

No it's all about hitting the bottom while being in the right position.

[Rusch69]

There is no limit. Actually a bigger drop should result in a stronger so called "leap". It really is about the way you hit the ground. Here is one in slow-motion, it probably helps you with positioning/timing:
Killamarci vs Kremlin GTASL SA

My personal experience is that the tires should hit the ground with a little delay.

[MxZz.]

My personal experience is that the tires should hit the ground with a little delay.

Yup + If it is a long distance, try to gain some rotation speed, the fastest the tyres hit the ground, the higher I got. I mean, get the right angle, press space left then space right right before reaching the ground. That's how i do it. Depends of how you're placed of course. Post a clip