Due to the heavier engine and body work along with wide tires, the ZR-1 is  heavier than the standard C4 Corvette. The ZR-1 came standard with the UJ6 Low-Tire-Pressure Warning System along with an ABS system manufactured by Bosch.
The ZR-1's increased weight stems from its larger engine, bodywork, and wider tires, which are reflected in the UJ6 Low-Tire-Pressure Warning System and the ABS system manufactured by Bosch.