part of an omnidrive system, which is for the meantime, not posible with the Tetrix kit.

Still, you would need omniwheels for an omnidrive system. And the Tetrix system doesn't have omniwheels.

<R5> Robot construction is constrained to the following: a. Any part included in the Official FTC competition kit may be used (except as limited below). Only one (1) NXT Controller Up to four (4) 12V DC drive Motors Up to six (6) Servos Up to three (3) NXT motors Only one (1) 12 VDC NiMH may be used to power the Robot. This battery must be identical to those supplied in the kit of parts. (Note: the TETRIX™ battery is custom designed with an internal 20 amp protection circuit. Use of any other battery could result in permanent damage to the NXT components and is not allowed). One (1) NXT rechargeable battery pack or six (6) AA batteries (any type). The packaging, manual binders, Styrofoam, cardboard, plastic bags, etc. from the kits are NOT included and CANNOT be used for robot construction. Only the TETRIX and LEGO parts themselves are allowed. b. The following additional components may also be used: LEGO approved NXT sensor Any NXT compatible sensor from HiTechnic, including the NXT Touch Sensor Multiplexer and the NXT prototype boards (both solderable and solderless) 1/8” Rope, any length 12” x 15” of Non-Slip Pad Universal Security Clips to hold PWM connections together, such as those found at http://www.maxxprod.com/mpi/mpi-3.html Any material strictly used as a color filter for a Light Sensor. The Permatex Super Lube provided by the TETRIX system may be used only to reduce friction with the Robot. Lubricants shall not be allowed to contaminate the playing field or other Robots.