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

Reply

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.

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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 ?

Reply

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.

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Answer 1

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 2

Hello James. We have the following parts available for your Dexter Nev-R-Adjust brakes: -Replacement Dexter Adjusting Spring #046-139-00 -Replacement Shoe and Lining for Nev-R-Adjust 12" x 2" Electric - RH #K71-676 -Replacement Shoe and…

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Answer 3

Hello Kirk, thanks for reaching out. We do offer L68149 / L44649 drums with the 5 on 4-1/2" bolt pattern, but they are all 10" drums like part #AKHD-545-35-EZ-K. We do not have a 7" drum that uses that bearing combination. What we…

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Answer 4

Other than the fact that the Curt #13147 has a slightly higher (500 lb) towing capacity and the fact that the hitch crossbar is round instead of square tubing, there's not a whole lot of difference functionally between the hitches you mentioned.…

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Answer 5

Grease seal width is not nearly as important as inner and out diameter. If the seal you have matches the diameters correctly and the bearings are also correct for the hub and spindle you are totally fine. You do not need to seat the seal beyond flush…

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Answer 6

Your spindle should have a Washer #SW1000 between the outer bearing and the Spindle Nut #165686. As this part is typically always reused that is the reason it is not included in the Bearing Kit #BK1-150. Instead we only include the cotter pin and…

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Answer 7

Installing brakes on a trailer really isn't too bad. The install is pretty basic and a DIYer like yourself wouldn't have a problem at all. To determine the parts you need though we need to for sure know what axles/spindles you have so that we…

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Answer 8

BTR and BT8 are the reference numbers for a standard trailer spindle size. When picking out a hub for a trailer you have to make sure that the hub is designed to fit the spindle. What you will need to do is measure spindles on your trailer where the…

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Answer 9

I would be happy to help! Unfortunately we do not have a breakdown of the specific components for your Spartan Sport Trailer, so you will need to remove one of your hub assemblies. With the hub assembly removed you will need to look on the face of…

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Answer 10

Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer. You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the…

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Answer 11

Based on the photo and information you provided, I can tell you have 12 x 2 inch Dexter brake assemblies for 5.2K axles, for which the Electric Trailer Brake Kit #AKEBRK-7-SA will be an excellent replacement. These are self-adjusting brakes so they…

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Answer 12

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

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