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LEGO Technic 42099 is a fun Technic set. It is a remote-controlled Off-roader which has certain off-road ability.
However, it is not enough for a so-called "X-treme Off-Roader". It was critized of: 1. climbing power, 2. ground clearance, 3 no differential lock.
Racingbrick has done a good job for solving climbing power by changing gear ratio, and I has found a very way to improve ground clearance within few minutes.