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Needs Grease Seals of Approximately 1.22-Inch Inner Diameter for Home-Made Motorcycle Trailer

Question:

I have what looks to be a homemade single rail motorcycle trailer. I do not know the manufacturer of the axle. The axle is square which measures 1 1/4inch width x 62 3/8 long end to end. I have purchased the correct bearings and races. Apparently someone in the past had replaced the seals with the incorrect size. the inside diameter of the seal lip was too big which did not come close to sealing. I have measured the area where the lip of the seal seats on the axle shaft with a digital micrometer which measures 1.22 inches or 30.9 mm. The inner diameter of the hub where the seal is pressed into measures 1.97 inches or 50.23mm. The thickness of the seal is the metal casing is 0.312 Since the 1.22 inches is the actual size of the shaft where the seal seals, wouldnt I need a seal with a slightly smaller inner diameter so that the seal will seal properly? Please help. I have not had any luck with auto parts stores.

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Expert Reply:

Thank you for providing precise measurements for the required grease seals for your home-made single rail motorcycle trailer.

Based on your measurements you can use part # 34823 from Tru-Ryde. This grease seal has dimensions quite close to those you provided. The dimensions of this double-lip seal are as follows: the inner diameter is 1.249 inches and the outer diameter is 1.983 inches.

It is sold as a single unit (so please order two per axle).

For reference I have included a link to our main product page for grease seals. You can sort product
results using the filters at the left-hand side of the page. The part I have referenced is the third item shown on the page. I have also linked a helpful article concerning bearings, races and seals.

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