For OEMs, Independent Retrofit Companies, and Transit Bus Technicians

While a bus is operating on a level surface with full air bags up, the GARD should ride 3" to 5" off the ground, with 4-1/2" being the optimum height. It should also be in-board of the tire tread edge curbside 1 to 2".

When the bus is loading or off-loading passengers at the curb of a crowned road, the sway of the bus to the right should then close the gap to 3" to 4" affording maximum protection in front of the rear wheels during and immediately after the loading/off-loading process.


Once GARD is installed, gap from bottom of the GARD to road surface should be 3-5 inches with bus engine running, air in system, and on a level surface.

Outside wall of tire

Edge of tire tread

Outside face of GARD

Install receiver mount so that outside face of GARD is 1 to 2" in from the outside edge of the tire tread, not sidewall of tire.

(Except RTS/TMC model buses due to exterior body configuration.)


S-1 GARD must be installed properly

Warranty is void if installed incorrectly

If S-1 GARD does not fit as instructed, contact us immediately for technical support.

Gap between radius of tire and edge of GARD should be 2-6 inches.

PUBLIC TRANSPORTATION SAFETY INT’L. CORP Est. 1993  |  PacMutual Plaza, 523 West 6th Street Suite 1101, Los Angeles, CA 90014

© 1993–2016 All rights reserved

Receiver must be mounted as high as possible to rocker panel, but leaving enough clearance for GARD to slide in channel.