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If you are building or repairing a small trailer, the biggest thing to get right is the stub axle — the short spindle-and-hub assembly that carries the wheel and takes the road shock. Its load rating and spindle geometry set how much weight you can carry and how the trailer tracks. The short answer: the Reliable 500 lb. Capacity Torsional Stub Axles pair is the pick that suits the widest set of small-trailer builds, because it gives you independent torsion suspension, forged spindles, and a 500 lb capacity per unit in one package.
I’m Min — the founder and writer behind Gadgets Feed. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
A stub axle is not a full beam axle. It bolts or welds to your frame and works with a torsion cord instead of a leaf spring, so the ride and the fit differ from a traditional axle. This breakdown of the axleless trailer spindles market covers the load limits and bearing sizes you need before you buy.
Our Picks at a Glance
How To Choose The Best Axleless Trailer Spindles
A stub axle only works if it matches your rig on three points: the load you will actually carry, the wheel size that will spin on it, and whether the spindle fits the axle or hub you already own. Get any of those three wrong and the part sits in a box. Here are the specifics.
Start with your real load, then add margin
Capacity is the number that protects you — a 500 lb rating means each stub axle is built for a light trailer, like a small motorcycle hauler or a utility cart. A 2,000 lb rating is a different build class entirely. Choose the rating for the heaviest load you will ever pull, not the average trip. The Trailers Spindle’s 3,500 lb figure in this list is the ceiling of the group, while the Reliable pair sits down at 500 lb — a gap of over seven times between the two.
Match the wheel size before you order
A stub axle is only half the equation — the rim has to fit. The Reliable pair is specified for 8″ to 12″ wheel rims, and you are warned not to go past 12″. A bigger rim on a smaller-rating stub axle overloads the bearings and wrecks the geometry. Check your rim diameter before anything else.
Bearing and spindle threads across brands
If you are replacing a Tie Down Engineering spindle, the thread has to match. The Sturdy Built spindle is sized for a 1 3/8″ inner bearing (68149) and a 1 1/16″ outer bearing (44649), and it uses a standard 1.72″ inner-diameter grease seal. Those are not universal numbers — a mismatched set will not seat, no matter how hard you press it. Buy to the bearing numbers first and the price tag second.
Bolted or welded — decide before you buy
Most of these stub axles can be either bolted or welded to the trailer frame. Bolted makes replacement easier; welded makes a stronger connection if you plan a permanent build. Rigid Hitch’s TSA-5100, TSA-10150 and TSA-20150 give you both options. One detail to carry with you: when the listing says bolted, it also says hardware is not included. Budget for bolts and nuts separately, and plan the welding or torque spec around your actual frame.
Quick Comparison
| Model | Best For | Load Rating | Hub / Spindle Spec | Mounting | Amazon |
|---|---|---|---|---|---|
| Reliable 500 lb. Capacity Torsional Stub Axles – Pair★ Best Overall | Widest range of small builds | 500 lb | 1″ straight spindles, 45° down | Bolt or weld | Amazon |
| Trailer Spindle for 5 Lug Tie Down Engineering Torsion Axle 3,500 lb #84Highest Load Rating | Tie Down 3,500 lb axle swaps | 3,500 lb | 5-lug, 68149/44649 bearings | Torsion, threaded spindle | Amazon |
| 500 lb. Torsional Stub Axles With 4-Bolt on 4 Inch Hubs (TSA-5100) | Custom motorcycle trailer builds | 500 lb | 4-bolt on 4″ hubs, 45° down | Bolt or weld | Amazon |
| 1,000 lb. Torsional Stub Axles With 5-Bolt on 4-1/2 Inch Hubs (TSA-10150) | Mid-weight custom trailers | 1,000 lb | 5-bolt on 4-1/2″ hubs, 45° down | Bolt or weld | Amazon |
| 2,000 lb. Torsional Stub Axles with 5-Bolt on 4-1/2 Inch Hubs (TSA-20150) | Heaviest cargo and utility builds | 2,000 lb | 5-bolt on 4-1/2″ hubs, 2-1/2″ travel | Bolt or weld | Amazon |
In‑Depth Reviews
1. Reliable 500 lb. Capacity Torsional Stub Axles – Pair
Our pick — 4.5+★ from 20+ verified ratings; the strongest balance of quality and price.
The pair that lets you build a small trailer without a full beam axle in the way.
This is the pick that suits the most small-trailer builders, because Reliable gives you a matched left-and-right pair with forged one-piece spindles in a single box. Each unit is rated at 500 lb, and they are built for 8″ to 12″ wheel rims — the size you actually use on a light utility or motorcycle trailer. The 1″ straight spindles come with castle nuts and cotter pins, so you get the locking hardware that keeps the wheel nut from wandering. It is a 4.5+ star crowd favorite with a small but committed owner base, and the pattern across those reviews is that the part simply works as described.
The engineering choice that matters most here is the progressive torque action combined with independent suspension. In plain terms, each side of the trailer absorbs a bump on its own instead of rocking the whole frame, and the rubber-based torsion spring stiffens as it compresses. That progressive rubber spring is why an axleless trailer rides planted instead of bouncing over bumps. The stub axles bolt or weld to your trailer frame, so you can plan a bolt-on build for easier servicing or weld them for a permanent job. One-piece forged spindles are a real strength — there is no joint to loosen under load.
What wins people over is the completeness of the set: two axleless torsion assemblies with hardware, in one package. Where you need to be careful is the rim limit — Reliable says do not exceed a 12″ rim, which means this is a small-wheel build, not a highway cargo trailer. That means the Reliable is for a light trailer only. It holds the highest score of the group at 4.5+ stars, though another pick has more ratings to its name.
Why builders like this pair
- One forged piece per spindle — no joint to loosen under a bump.
- True independent suspension, so each wheel absorbs road shock alone.
- Castle nuts and cotter pins included, which you would otherwise have to source.
- Matched left and right units in a single box.
Read before you order
- Do not exceed a 12″ rim — bigger wheels are ruled out.
- 500 lb rating caps you to a genuinely light trailer.
- Bolt-on installers supply their own hardware.
Reach for this if: you are building a light trailer with 8″ to 12″ wheels and you want a complete, forged, independent pair.
Look elsewhere if: your load runs past 500 lb per side — a higher-rated Rigid Hitch or Tie Down unit is the honest move.
2. Trailer Spindle for 5 Lug Tie Down Engineering Torsion Axle 3,500 lb #84 Spindle
A direct-fit replacement spindle for the Tie Down axle you already own.
If you already run a Tie Down Engineering 3,500 lb torsion axle, this Sturdy Built spindle is the straightforward swap — it fits that axle, threads into a 5-lug hub, and carries a 3,500 lb rating. It spoils you with one small extra, too — the Accu-Lube greaseable zerk fitting lets you pack the bearing with grease without pulling the hub.
The bearing numbers are the critical detail for a smooth swap. This spindle uses a 1 3/8″ inner bearing (68149) and a 1 1/16″ outer bearing (44649), plus a standard UHI 1.72″ inner-diameter grease seal. Measure your existing hub against those numbers before you buy. If they match, the install is a few hours of honest work and the spindle seats properly. The spindle itself weighs 3.63 lb, which is light enough that the box is manageable and heavy enough to feel like forged hardware, not stamped sheet.
What buyers report most in the review pages is quality construction and functionality — the consensus is that it is a well-made part that does its job. The honest catch is fitment certainty: this is not a universal spindle, so if your axle is not a Tie Down 3,500 lb unit, it will not fit. The rating sits at 4.0+ stars on a modest base of ratings, which reflects a repair part that most people only buy when they need one. If your axle is right, this is the fix.
The fitment math: 68149 inner, 44649 outer, 1.72″ seal — check all three against your hub first.
The trade-off: it is built to one axle family, so it is a repair solution rather than a flexible build part.
Pick it for: a like-for-like replacement on a Tie Down Engineering 3,500 lb torsion axle.
Pass on it if: you are starting a fresh build with a different axle brand — this one is not a universal fit.
3. 500 lb. Torsional Stub Axles With 4-Bolt on 4 Inch Hubs (TSA-5100)
Built for the maker building a one-off trailer from the frame up.
The Rigid Hitch TSA-5100 is a 500 lb stub axle with a 4-bolt on 4″ hub pattern and a 45 degree downward starting angle. The 45 degree angle is what sets your trailer’s ride height, so it is the number you plan the frame around. With a 4-bolt 4″ hub you get a common small-wheel pattern that matches many light trailer rims. Rigid Hitch frames it as an easy way to build your own custom motorcycle trailer, and that is the exact use where this part earns its place.
Mounting is your choice — bolt it on, hardware sold separately, or weld it to your frame. Bolted is easier to swap; welded is stronger for a permanent build. Because this is a stub axle rather than a beam, each one is a short, independent assembly that carries one wheel. That independent wheel movement reduces trailer sway, which matters most on a light trailer where a curb strike can upset the whole rig.
The honest note here is the score — 4.0+ stars on 10+ ratings, the lowest in this group. That is still a genuinely useful part, but it tells you the margin for fitment decisions is tighter here: this is a builder’s component, not a plug-and-play. A second thing to keep in mind is that hardware for the bolt-on route is not in the box, so plan for it in your parts run. If your build is light and handmade, the 45 degree geometry is the right starting point.
The case for starting here
- 45 degree start angle takes the guesswork out of frame height.
- 4-bolt 4″ hub pattern fits common light trailer rims.
- Bolt or weld, so you can change your plan mid-build.
The details that bite
- Hardware for bolting is not included.
- 500 lb rating is light-trailer only.
- Lowest score in the lineup, so double-check your fit numbers.
Best for the frame-up custom job: a 500 lb light trailer where you own the welding or wrench work.
Reconsider if: you want included mounting hardware and a proven fit — a higher-rated Rigid Hitch unit is the safer call.
4. 1,000 lb. Torsional Stub Axles With 5-Bolt on 4-1/2 Inch Hubs (TSA-10150)
Hits the middle of the range — double the light rating, without the heavy-build complexity.
The Rigid Hitch TSA-10150 doubles the 500 lb figures below it, at 1,000 lb, and steps up to a 5-bolt on 4-1/2″ hub pattern. Those two facts define who it is for: a trailer heavy enough to need the extra capacity, but not so heavy that you are shopping 2,000 lb hardware. The 45 degree downward starting angle is the same clean geometry you get across the Rigid Hitch line, so your frame planning works the same way here. It rates 4.0+ stars, the second-highest score in this list.
The 5-bolt 4-1/2″ pattern is the most common light-to-mid trailer rim pattern, which makes sourcing wheels easier than with the 4-bolt hubs. You get both mounting routes — bolt, with hardware not included, or weld — because those are alternatives you can decide right against the frame. This is not a bolt-and-go kit; it is a component for someone who plans a build.
It is genuinely a middle pick, and that is its story. If your load sits near 1,000 lb you get the rating without the extra weight and complexity of the 2,000 lb version. The trade-off is that it is a build part, not an included hardware kit — nothing about the mounting is finished for you. For a custom motorcycle trailer or a mid-size utility cart, the load figure lines up well. In short, the TSA-10150 suits a mid-weight build — heavier than a light utility cart, lighter than a loaded cargo trailer.
Why the step up matters: 1,000 lb puts you in utility-cart territory without touching the 2,000 lb hardware class.
Keep in mind: bolt-on hardware is not in the box, and there is no included hub assembly listed here.
Go here if: your trailer sits near 1,000 lb and you want a common 5-bolt 4-1/2″ wheel pattern.
Skip if: you are pulling heavy cargo — the 2,000 lb version is the one built for that.
5. 2,000 lb. Torsional Stub Axles with 5-Bolt on 4-1/2 Inch Hubs (TSA-20150)
The kit that shows up with hubs, bearings, seals, and lugs — not just the spindles.
The TSA-20150 is the only pick here that ships as a complete hub assembly, so you get the whole wheel-end setup instead of just the axle. The box holds two 5-bolt on 4-1/2″ bolt-circle hubs (the circle the wheel studs sit on) with seals, bearings, dust caps, cotter pins, and lug nuts, plus left- and right-hand stub axles — four items in total. It carries a 2,000 lb rating, the highest towing capacity in this group, so it suits a loaded cargo trailer rather than a light utility build.
Its torsion system uses specially formulated rubber cords that cushion the turning action and give each wheel independent movement to reduce sway. It also specifies 2-1/2″ of travel — the distance the spindle can move through its compression — which is the figure you use to plan your fender clearance. The 45 degree downward starting angle is the same geometry used across the Rigid Hitch line. It is powder-coated alloy steel, so the finish and the material are both specified for a working trailer.
What owners talk about most is quality and functionality — the steady theme is that it is a quality product that works. If all you need is a light motorcycle trailer, the 500 lb units in this list do that job without the extra rating. If you are building a cargo or utility trailer that will actually carry a load, this is the one that arrives ready to assemble.
What makes it a complete package
- Hubs, bearings, seals, dust caps, cotter pins, and lug nuts all included.
- 2,000 lb towing capacity, the highest in this guide.
- 2-1/2″ of torsion travel gives you real fender-clearance planning room.
What to weigh first
- 2,000 lb is more capacity than a light trailer needs.
- Bolted mounting still means sourcing hardware yourself.
- Lowest score in the lineup at 4.0+ stars.
Choose it for: a utility or cargo trailer build that needs a full hub package and a 2,000 lb rating.
Think twice if: your trailer is light and simple — the 500 lb Rigid Hitch does the job for far less hardware.
Understanding the Specs
Load rating and what it really means
The load rating tells you the maximum weight each stub axle is built to carry, so it decides which trailer class the part belongs to. The numbers run 500 lb on the Reliable pair and the TSA-5100, 1,000 lb on the TSA-10150, 2,000 lb on the TSA-20150, and 3,500 lb on the Tie Down replacement spindle. A light motorcycle or utility trailer fits a 500 lb unit, while a loaded cargo trailer needs the higher figures. Buy for your heaviest trip, not your average one.
Spindle angle, travel, and bearing size
The starting angle — 45 degrees down on every build part here — sets how the spindle sits relative to the frame and, in practice, your trailer’s ride height. Travel, given as 2-1/2″ on the TSA-20150, is how far the torsion assembly can compress, which sets your fender clearance. Bearing size is the fitment key: the Sturdy Built spindle uses a 1 3/8″ inner bearing (68149) and a 1 1/16″ outer bearing (44649) with a 1.72″ seal. Match those numbers to your hub or the part will not seat.
FAQ
Will a stub axle bolt to my trailer frame without welding?
Do these stub axles work with a 15 inch wheel?
What bearings does the Tie Down replacement spindle take?
What does a 45 degree starting angle change about my trailer?
Is the 2,000 lb TSA-20150 kit really the only one with hubs?
Can I use one stub axle on each side of a trailer?
How much travel does the TSA-20150 have and why does it matter?
Should I buy a lighter stub axle to save weight on a small trailer?
What do I need for a first-time trailer build with these stub axles?
Final Thoughts: The Verdict
For most light trailer builds, the axleless trailer spindles winner is the Reliable 500 lb. Capacity Torsional Stub Axles – Pair. You get a matched left-and-right set of forged, independent torsion spindles (each side flexes on its own rubber spring) with locking hardware and a clear 8″ to 12″ rim spec, so a small utility or motorcycle trailer gets a complete package in one box.
If you are building a cargo or utility trailer that will actually carry a load, grab the Rigid Hitch TSA-20150, the one pick here that arrives with hubs, bearings, seals, and lug nuts included. And if you simply need to replace a spindle on a Tie Down Engineering 3,500 lb axle, the Sturdy Built replacement spindle is the direct-fit part that gets you back on the road.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of November 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gadgets Feed earns from qualifying purchases. This does not affect which products we feature.