How to Tell if Trailer has a BT8 or BTR Spindle Installed

Question

Question:

I need a hub, wheel and tire, lug nuts. Its a 1 inch spindle shaft. How do I know if it is a BT8 or BTR or what?

asked by: Greg B

0

Expert Reply:

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part # AKIHUB-440-2-1K for an idler hub.

A BTR spindle would have dimensions of 1.06 inch for outer and inner bearing plus 1.50 inch where grease seal would install. That would require an idler hub part # AKIHUB-545-2-G-2K.

expert reply by: Jameson C

0

Jay

6/8/2025

what hub kits will fit on 0.749" spindles

Jameson C.

6/9/2025

@Jay Nothing that we have as that's not a current spindle size that is supported. Normally in this situation easiest route to go is to replace the axles.

Jay

6/12/2025

@JamesonC the axle is a 3 sided channel. 1 1/16" i d . do you carry a square ended replacement spindle i can weld in that has a 1" straight hub 4x4.5 / complete kit with bearing buddies ?

Jameson C.

6/16/2025

@Jay We do have a square spindle that is 1 inch in diameter with the part # TRU97FR. The square portion of the spindle is 1.5 inch by 1.5 inch.

Answer 1

Hey Scott! I recommend using the Hydrastar Marine Electric Over Hydraulic Actuator for Disc Brakes #HS381-8067. Hydrastar is a reliable, proven brand so it will serve you well. Then for brake lines you can use the Hydrastar Hydraulic Brake Line Kit -…

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Answer 2

The BTR and BT8 denotations refer to the spindle, not the trailer hub. The difference between a BTR and BT8 spindle is that the BTR spindle uses a 1.063" diameter L44649 bearing and the BT8 spindle uses a 0.99" diameter L44643 bearing. In…

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Answer 3

Hey Mike. The Deutsche Hydrapro Alpha G-1600 item #DH94FR and the DeeMaxx Alpha G1600 item #DE47SR have different fittings on them. The DeeMaxx actuator item #DE47SR has a brass fitting/valve that connects to the main brake line, whereas the Hydrapro…

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Answer 4

Hey Ryan, most likely what you have is a 2,000 lb axle and the correct replacement hub would b the part #AKIHUB-440-2-G-1K which also has the correct 4 on 4 inch bolt pattern you need but we still would want to verify to be sure. Since you don't…

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Answer 5

You can check the condition of your hub's races by carefully removing all bearing grease with a rag to expose the actual surface of the races. When they are completely free of grease, etc., inspect them for any signs of scoring (very slight…

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Answer 6

Hey Thomas, thanks for reaching out. All of the 145/12 tire/wheel combos we offer come with rubber valve stems like part #AM20904. If you prefer the metal valve stems, we do carry those as part #AM20906. If you go that route, I recommend getting the…

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Answer 7

The brake caliper mounting bracket that comes with the Titan Premier Disc Brake Kit part #T2HRCM10DAC has a standard four bolt brake mounting flange pattern. This pattern is an industry standard so as long as you have the four hole pattern there will…

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Answer 8

The etrailer Axle #e32GR uses a Easy Grease Trailer Idler Hub Assembly #AKIHUB-545-2-EZ-2K which will use the Bearing Kit #BK1-150. I do recommend pulling one of your hubs apart to verify that the bearings and seals match the spindle on your axle.…

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Answer 9

Hey Steven, you do have a unique setup but we do have the CE Smith 2,700 lb axle hub part #CE13109 that matches the bearing and seal dimensions you have/need. This has a 4 on 4 inch wheel bolt pattern but if you need 5 on 4-1/2 inch you'd instead…

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Answer 10

A lot depends on where you are taking that measurement. If you look at the spindle main page I have linked for you, you will see the important spindle measurements I would need to determine what, if any, bearings we carry will fit. If you have access…

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Answer 11

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 12

The exact replacement for the hub you have is the part #84545UC1-EZ. This will install on your spindle and has a 5 on 4-1/2 inch bolt pattern like you need as well.

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How to Tell if Trailer has a BT8 or BTR Spindle Installed

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