I think the rule that people are chatting about is this
Quote:
23.12 The use of sensors fitted to wheels, lay-shafts or suspension units to aid traction control or active
suspension is prohibited. The use of the third channel parameter on a receiver is limited to external power
supply only (no signal circuitry allowed).
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So, unless you are using sensors to control damping or suspension geometry and it is a passive system, like SACS on the Fireblade, then ok, the rule was brought in after the 1991 Basildon worlds, with LRP's system which used a gyro and rpm sensors to control wheelspin and steering angle of the servo.