What Is the Difference Between a BTR and BT8 Spindle

Question

Question:

Hi. Im wanting to buy new wheel hubs for my utility trailer. Seems I will need a BTR or a BT16 wheel hub but I dont understand the difference in these two hubs. Can you please explain?

asked by: William C

0

Expert Reply:

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 order to find out which you have you will need to pull the hub and either measure the spindle or look for the bearing numbers on the bearing.

If you have BTR spindles then you can use part # AKIHUB-440-2-2K.

expert reply by: Conner L

0

Rich

8/5/2020

What wheel bearing size do I need for a 2000 trail star trailer?

Chris R.

8/14/2020

In order to determine the right replacement bearings you will need to actually pull one of the hubs and see if you can read the numbers stamped inside the bearings themselves. If not, you can measure the spindle where they sit to get their inner diameter. If you can let me know either piece of info I will be happy to recommend the correct replacements.

Brad

10/20/2024

@ChrisR I measure my spindle and it is 1.01" in on digital zeroed caliper. Which should I use, BTR or BT8?

John R.

7/29/2025

My trailer axel spindle is tapered. It has a Knott 6B2933 trailer hub which seems to be no longer available. What do I replace this hub with? John

Robin H.

7/29/2025

@JohnR you will have to measure the spindle where the bearings ride so we can identify the bearings and see if a hub is available. The other option is to give us the axle manufacturer along with the serial number off the axle tag which may be able to be used to identify it.

John R.

7/30/2025

@RobinH Thanks for getting back to me. The tapered spindle measures 1 3/8" at the back then tapers to 1 1/4" at the front. Knott 6B2933 trailer hub for tapered spindle. I appreciate your help, thank you. John

Robin H.

8/3/2025

@JohnR the only bearing that matches that 1-3/8" measurement is for agricultural hubs. More than likely it is an obsolete bearing combination. It looks like some places still carry the 6B2933 so I would get the exact replacement.

See All (4) Replies to John R. ∨

Answer 1

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…

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Answer 2

You will need to measure the diameter of the spindles where the seal and bearings ride. Check out the picture I attached that shows where this is. You will need an exact measurement so either a digital or dial caliper will be needed. To pick out the…

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Answer 3

Hey Steven. What's your question? If your 2,200 lbs axle has a 1-1/16" BTR Spindle you'll have the same inner and outer bearing size item #L44649. You'll need a seal with a 1.25" inner diameter. You can get all of these parts…

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Answer 4

The LED Trailer Mini Clearance and Side Marker Light with Grommet #MCL10AKB will fit best with a wall (or bracket) thickness that is just under 5/16".

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Answer 5

If your trailer axle doesn't currently have brake mounting flanges you have a couple of options, one of which is to simply weld on flanges like you mentioned. A brake mounting flange needs to be welded perfectly square and concentric, which…

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Answer 6

Hi Andi, A 5.3R12 wheel would have an overall diameter of 21.9" and the Kenda 145/80R12 #AM35351DX would have a 21.13" overall diameter, giving you a .77" difference. This going smaller would slightly lower the trailer, but at…

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Answer 7

Verify your bearing numbers and bolt pattern to be sure but I believe either #8-258-5UC1-EZ for E-Z Lube axles or #8-258-5UC1 for standard axles is what you need. Both of these hubs include bearing #L44649 for the inner and outer. They have a 5 on…

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Answer 8

I will start by sating that the wheels/tires on the trailer you are looking at do look kind of undersized. So you definitely can stay with a 13" set up like the Kenda Karrier ST185/80R13 Radial Trailer Tire - Load Range D #AM10208 and Dexstar…

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Answer 9

The left side is the driver side, right side is passenger side. On a trailer brake assembly like #23-105 the arm that the magnet is on points to the front of the trailer and the magnet always will be on the bottom. I have included a picture that…

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Answer 10

On a trailer electric brake assembly like the Dexter 6,000 Pound #23-105 you were looking at the magnet itself should be at the bottom. The arm that is attached to the magnet should then be located on the front side of the trailer (towards the…

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Answer 11

Hey Luke! On the etrailer scissor jacks #e56VV, the closest bolt holes center-to-center are about 3-1/2" apart, while the next set of holes is 4-1/2" center-to-center. Since yours are currently 80mm apart, that translates to a little less…

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Answer 12

We offer the correct replacement for you. If you have EZ-Lube spindles, use #8-259-5UC1-EZ or #8-259-5UC1 for standard spindles. The hub includes the L44649 inner and outer bearings, the L44610 inner and outer race, the 10-9 grease seal, the dust cap…

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What Is the Difference Between a BTR and BT8 Spindle

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