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To determine which axle measure your existing axle from inside brake shoes from spider to spider (plate the brake shoes attach to). If 54" then you need the 71.5, If 60" then the 77.5. Also note the bearing combination you have. In general a 71.5" track axle goes on a 96" wide trailer and a 77.5" track axle goes on a 102" wide trailer.
Trailer Axles
When calling I will need the following info below to get pricing on axles.
Manufactured to Ridewell’s stringent specifications Straight and drop center beams availableCustom track widths available16 1/2"x 7" and 12"x 7 1/2" BrakesNominal wall thickness: 1/2", 5/8", 3/4"Full range of hub and drum choicesBacked by a Ridewell warranty