Trailer Canada - How to Measure Trailer Wheel and Tire

How to Measure Trailer Wheel and Tire

Please note all dimensions are expressed in imperial units which are inches and feet.

Before you get started we recommend that you gather the following:
an assistant
tape measure
two straight edges
bolt circle template
notepad
pen
digital caliper

How to Determine Bolt Pattern:
Match wheels to hubs by the number of bolts and bolt circle pattern. To determine the bolt circle on wheels with an even number of bolt holes (4 on 4”, 6 on 5 ½” or 8 on 6 ½”), measure center-to-center on bolt holes directly across from each other (see illustration). On odd number bolt wheels (5 bolt), measure any bolt hole center directly across to other side half way between two bolt holes to a point on an arch drawn between the two holes. (see illustration) (Example: 5 on 4 ½ would mean 5 bolt holes with 4 ½” measured to a point on an arch halfway between the opposite bolts).

How to Determine Wheel Offset:
Offset is the distance between the mounting face of the disc and rim centerline.

Inset: Refers to the distance when the mounting face is outboard of the rim centerline.

Outset: Refers to the distance when the mounting face is inboard of the rim centerline.

It is important that you get the precise measurements to ensure the axle would fit.

For questions or more information email us at [email protected] or call us at 1-888-645-6998

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