This SAE Recommended Practice applies to rigid bumper or rigid structure points and flexible components of passenger cars, multipurpose passenger vehicles, and light trucks. This document is intended as a guide toward standard practice and is subject to change to keep pace with experience and technical advances.
Rationale
This Recommended Practice provides minimum static design guidelines for curbstone clearance, approach, departure, and ramp breakover angles at a manufacturer’s most severe vehicle design load. This is to minimize the potential for any damage in normal vehicle use conditions. SAE J689 also defines front and rear bumper heights for two different vehicle loading conditions, but does not provide any design guidance.
The document was last revised in 1996 by the Bumper Standards committee (no longer active). It was confirmed that all dimensions save “3.8 Parking Curbstone Height Clearance” are in the current SAE J1100 with illustrations. Curbstone heights are typically a function of road classification (source: AASHTO). HADD agreed to adopt SAE J689, incorporating curbstone definition into SAE J1100, then to CANCEL it once SAE J1100 was published.
The dimension minimum values given in SAE J689 are:
These target dimensions in SAE J689 will be lost, but the HADD committee determined that these values were not very useful for current vehicle designs. Manufacturers typically establish design minimums that differ according to vehicle type or market segment. A single minimum value that applies to all vehicles (such as provided in SAE J689) for curbstone clearance, approach, departure, and ramp breakover angles is no longer sufficient.
The following table maps the SAE J689 dimension codes to their SAE J1100 equivalents:
The Human Accommodation and Design Devices Standards Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports related to tools, models and procedures to create and improve the occupant package ergonomic layout of the vehicle's interior tools and procedures for consistent measurement of vehicle dimensions and seat dimensions taken during design, benchmarking, and auditing. The committee actively leads and works to have its standards adopted internationally. Participants in the SAE Human Accommodation and Design Devices Standards Committee include OEMs, suppliers, academicians, consulting firms, government, and other interested parties.
* Redlines comparisons are available for those standards
listed in the Revision History that contain a radio button. A
redline comparison of the current version against a revision is
accomplished by selecting the radio button next to the standard and
then selecting 'compare'. At this time, Redline versions only exist
for some AMS standards. SAE will continue to add redline versioning
with ongoing updates to SAE MOBILUS.
View/Annotate
Content Loading, Please Wait
Document Preview
Content Loading, Please Wait
Document Comparison
Content Loading, Please Wait
Download
A list of downloadable items.
Product Code
Document Title
File Type
Download
J689_200908
Curbstone Clearance, Approach, Departure, and Ramp Breakover Angles—Passenger Car and Light Truck
Export Metadata
This modal will allow the user to download citation information or export specific fields of data into one of three file formats: Excel, comma-separated values, or text.
You are currently not logged into your Dashboard account, which is required for annotating.
Please select Login to login or register for the Dashboard. Select Continue to view the content without the ability to annotate.
Redline Warning
You are currently not logged into your Dashboard account, which is required for annotating.
Please select Login to login or register for the Dashboard. Select Continue to view the content without the ability to annotate.
Data Set Warning
Curbstone Clearance, Approach, Departure, and Ramp Breakover Angles—Passenger Car and Light Truck
SAE Journal Subscriptions are available in a variety of options, which include electronic, electronic with back file, and archive. For detailed information and options, please complete the following:
Content Request
Check My Access!
You may already have access to the Ground Vehicle Standard, Curbstone Clearance, Approach, Departure, and Ramp Breakover Angles—Passenger Car and Light Truck
Subscription Access
If you have Subscription Access with a username and password, please login below.
Institutional Login
If you have Institutional Access to SAE MOBILUS, using a predetermined organizational login utilizing single-sign-on (Shibboleth), please login below. To request institutional access to SAE MOBILUS, please complete the institutional subscription information form.
Purchase
If you do not have access to SAE MOBILUS via username/password or institutional access, you can still purchase the Ground Vehicle Standard, Curbstone Clearance, Approach, Departure, and Ramp Breakover Angles—Passenger Car and Light Truck.
Search Tips: Search Operators:AND, OR, NOT; Wild Cards; Using Quotes
SAE MOBILUS® Search Tips
Please note: All terms not contained within quotes, will be evaluated using the OR operator. This means that your search results will contain all results that contain ANY of the entered terms.
AND, OR, NOT
SAE MOBILUS supports the use of the AND, OR and NOT BOOLEAN operators ONLY function with the Advanced Search.
Wild Cards
Using the asterisk, ( * ) allows you to search for a partial word. For example, entering a keyword search of aero* will search for any word beginning with aero.
Using the question mark, ( ? ) allows you to search for a word with a single character wildcard. For example, searching for t?re would match both tire and tyre
Using Quotes
Words in double quotes " " are treated as a phrase. Conducting a search for "heat model" will return all results in which the exact phrase "heat model" is found, while "heat modeling" would NOT be included.
A term combined with a phrase will be joined with an OR operator.
Searching for Standards
When searching for a standard please use the entire Document Number assigned, which includes the abbreviation. A space can be used, or omitted between the abbreviation and number.