Is there any reason cyberlimb armor wouldn't count towards encumbrance? The sentence describing cyberlimb armor doesn't mention it, and the rule about armor and encumbrance just says "If either of a character’s armor ratings exceeds his Body x 2, apply a –1 modifier to Agility and Reaction for every 2 points (or fraction thereof ) that his Body x 2 is exceeded."
It's around somewhere, I recall it, but not where.