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   Single-Wheeler Bicycle Trailers ('SST')

If you reached this site from the disaster relief blog, please take time to look at a more comprehensive addition to your Disaster Kit......our Nomad Tent Trailer.

Pictured is the Basic SST -20 with optimum ground clearance of 4.5 to 5 inches, adjustment for your seat-post height and a proprietary hitch. The ground clearance can be maintained even with your choice of any sized wheel, or platform. It may need another joint to reduce shipping and packaging costs.

Complete trailer as shown, including hitch-less than 10 lb!

"Al, a BIG thanks for that, the first link, Tony's trailers, has a ton of info, great reading! I can get the 26" wheels with tires and tubes ready to do for free, maybe I will go that route. I was already planing on dropping the cargo carrying floor of the trailer fairly close to the ground, I just figured it would be better, but now reading that page I understand why it will be better, and more stable." -from the mbtr Blog.

We have developed several models to suit the many needs out there as follows:
(See our SST comparison chart to help you decide)

Please note: All SSTs except the one above are shown with an 18-gallon/68 Litre Rubbermaid tote bolted to it. Totes are not included in the price and are usually too expensive to ship anywhere. Trailers are also available for other size totes, a bare chassis, or with a plywood flatdeck, to better suit your needs.

Single-wheeler 'SST trailer, 16 inch wheel
SST/16: The small wheel model

16" wheel / weight: 12 Lbs. / Recommended max. load: 60 lbs. (27 Kg)
Price: $495 Cdn ($391 US) plus shipping, taxes and duty as applicable

Single-wheeler 'SST trailer, 20 inch wheel
SST/20: The medium wheel size model
20" wheel / weight: 15 Lbs. / Recommended max. load: 60 lbs. (27 Kg)
Price: $517 Cdn ($408 US) plus shipping, taxes and duty as applicable

Single-wheeler 'SST trailer, 26 inch wheel
SST/26: The one on steroids
26" wheel / weight: 20 Lbs. / Recommended max. load: 60 lbs. (27 Kg)
Price: $555 Cdn ($438 US) plus shipping, taxes and duty as applicable

...and then the real aim of all this development work!

SST Convertible bicycle trailerSST Convertible trailer -- two-wheeled
SST/Convertible: Converts easily from a one-wheeler to a two-wheeler
20" wheel (in single-wheel mode) / 16" wheels in two-wheel mode (12.5" wheels shown)
Recommended max. load: 60 lbs. (27 Kg)
Price: $726 Cdn ($574 US) plus shipping, taxes and duty as applicable.

This model converts in seconds from a one-wheeler to a two wheeler, losing none of the benefits of either type in the process. You get the best of both worlds and can end the dreary arguments of which type you should buy. The chassis is expandable length-wise so it's adaptable to different loads in it's single-wheel guise. You can even have adjustable camber and toe-in when using the double mode.

The chassis extension adds less than 3 lbs. in weight while adding 18 inches in length to the Convertible single-wheeler.

Don Lawrence has built himself a lightweight cargo box on his SST ready for some long distance camping trips. This one was named Armageddon from the air-brushed ancient Hebrew hieroglyphics which cover the box.

Eclectic Electric - Click to Enlarge

"Eclectic Electrics"

Why do all the work when pulling a trailer? Now let the trailer push you instead.

As you know our SST's can have various sized wheels-whatever suits your purpose, and believe it or not either of those sizes. 16", 20" and 26" ( we'll throw in 24" as well) can now be fitted with an electric motor, hence "Eclectic Electrics". Shown is the prototype 26" size, with the battery still on the bike and a jury rigged cable. However you can see the potential as the battery can go in the tote and leave the bike practically with nothing but a throttle and control cable, while the rest is in or on the trailer.

Talk about adding versatility-works great too!

I am getting out of the E-Kit business but there is a great selection available on the internet and even at your local bike shop.


Ron Kitchen's Single wheeler from Jan 1955!

Two Chihuahuas enjoy their daily commute in suspended single wheel comfort with their owner on beautiful Vancouver Island. While on the right-could this be the one that started it all?- An ad from 1955 in Britain, it even has suspension!


More information:

Check out our comprehensive list of options to customize your trailer!

All you ever wanted to know about Single-Wheelers.

I made my first trailer a long time ago just after WW2 to be fairly precise, it was a two wheeler and quite rudimentary but it served its purpose for a week-long camping trip.

Didn't make another trailer til about ten years ago but in the eighties our shop made a whole variety of custom bicycles, tandems and racing wheelchairs, two wheelers, three wheelers and even a four wheeler that leaned in the corners, all lightweight that won several world championships between them.

So getting into trailers and specializing in custom design and build projects it was inevitable that I would be asked to come up with a design for a single-wheeler.

Not wanting to re-invent the wheel or infringe on any existing designs I took a look at what was out there and found that a manufacturer I knew had discontinued their single wheeled trailer, due to problems with instability.

I talked to them and arranged to borrow one to investigate the problem.

Their trailer consisted of an adaption of a child's trail-a-bike with the handlebars and saddle removed and a pannier mounted on a rack on a 26 inch wheel, so quite a high load.

Also on the market by another manufacturer at that time was a similar arrangement with six panniers on three racks-also a high load.!

Both of them hooked up to the seat post or near to it so the hitch at least was in the best place regarding height-but the load wasn't.

I built my first prototype and intuitively put the load down as low as practical and found that off the bike it was possible to wheel it around by the hitch handle as long as the weight was as low and as far forward as possible.

It could be loaded to be totally stable but with a full load some instability was introduced, however the substantially designed hitch was able to take care of this once hooked up to the seat-post.

Remember the importance of being able to handle your trailer when it is off the bike. This is a significant and practical advantage as most trailers need to be moved around quite often when away from the bike whether loaded or not.

Pleased that serendipity was alive and well I reported back to the manufacturer, demo'd the prototype and offered it to them for free. But they declined explaining they were concentrating on their main products and models.

I subsequently bought all their remaining stock-and still have really nice 26 inch wheels coming out of my ears.

Later showing it to good friends and avid trailerites, one deduced the basic physics in play, which I have shown graphically.

See the two pix that I have marked with what I call the line of stable equilibrium. Sound slightly nautical and if you have ever wondered what kept your boat from overturning you may have run across a similar term at least with that word mentioned

Low hitch, less stability.
High hitch, more stability.

This line runs from the pivot on the hitch to where the rubber hits the ground-which is the point at which the forces act that are trying to tip your trailer over (This applies to trailers no matter how many wheels they have and this is contrary to popular belief that these forces act at the height of the hub of the wheel).

All weight below this line tends to keep the trailer upright with no twisting moment on the hitch. Thus the higher the hitch and as low as the trailer can go and still have adequate ground clearance the better.

The two pix clearly show the larger volume available to the trailer with the seat-post hitch. It works out to about five times greater than the axle hitch can provide.

All of this translates into more stability when loaded, especially as we now know where to put all the heavy stuff. So it looks like the load is considerably more stable by using the seat-post hitch. Which transates into a steadier ride, with less work for the hitch and thus less wear and tear.

The other advantage of the seat-post hitch is the potential for carrying heavier loads because with all single wheelers the bicycle gets to share half of the weight of the cargo. And the high hitch loads the bike forward of the back wheel axle-see intro to cargo trailers which of course is far superior to dangling it off the back axle or worse- behind the back axle-or worse again behind the back wheel

Ground clearance was mentioned and it seems that in practice 4 inches is adequate even for most off-road stuff.

You will notice that to get this clearance on most single wheelers that hitch onto the rear axle you have to run 12.5 or 16 wheels. Talk about sluggish!

With the SST you can have any size wheel you want, still have the low ground clearance and thus maintain the higher stability factor. And enjoy low-low rolling resistance especially off-road!

Plus with the SST you can have any length you want-various styles from flat-deck to cargo basket-to bare chassis for your own ingenuity to take over.

We use a propriety hitch with mods-of course. So starting with the need for a universal joint to give the articulation required of a single wheeler we use that seat post again to better advantage by allowing the hitch to swing around the seat post as one of the movements of the U-joint, while the other movement-the vertical swing is taken care of with a damped pivot joint.

Dave another friend goes one further, as this arrangement make it easy to attach and detach the hitch by removing the seat-post.

This method means nothing stays on the bike when you are not pulling the trailer.

The ultimate conversion model is still available-you can have one or two wheels and switch to suit the circumstances.

There's no question that two-wheeled trailers are best where manoeuvrability is important, whether in the supermarkets or on the streets. But on the open road or narrow trails, one-wheelers are sometimes more suitable.

"The seatpost attachment is, in my experience and opinion, far superior to others that use a chainstay or rear-axle attachment, which I find inconvenient for hitching and unhitching and which put quite a bit of lateral pressure on the back/rear wheel of the bike when cornering. The difference in this effect is especially noticeable when the roads are damp or wet. Having sideways exertion on the rear wheel in low-traction situations can be very unnerving, and Tony's seatpost-attached designs greatly reduce or eliminate this effect.

I own a very popular single-wheel trailer that attaches to the rear axle, which I've used extensively, and it's very difficult to manoeuvre when loaded. In addition, the lateral movement on the rear axle and within the trailer's framework can lead to severe oscillation and great difficulty in controlling the bike (even with a rather heavy mountain bike). This is something that I've never experienced with any design from Tony Hoar.

Finding a place to park a bicycle with an attached trailer can be difficult, and in some areas, impossible. Tony's designs make it easy to detach the trailer and use it to collect the items you want to load, then wheel the trailer back to the bike and attach it with no trouble.

Tony's trailers are engineered and manufactured to a very high standard. They are lightweight, manoeuverable, effective, and they quite honestly changed my entire approach to personal transportation."

- Allan Dunlop, Director, The Center for Cycling Education

Combining the benefits of both configurations in one trailer is a concept that I have been playing around with for the past 3 years or so. It has involved at least ten prototypes and lots of experimentation.

Testing was aided and abetted by my usual long-term team of testers, to whom I owe a debt of gratitude. Lots of fun and also very educational. Now the product of all this work (and play) is available for all to enjoy!

...and we ship all over the world!

Now you have read our dissertation on what we find works and what doesn't with Single Wheelers. From our simple graphical demonstration you can take a look at any single wheeler and ascertain how stable it will be, and also figure out if there's the slightest chance you will be able to move it around loaded, while it's off the bike. We do admit that some manufacturers seem to, or claim to, have found ways to circumvent the laws of physics, we just don't believe them and now you have the opportunity to assess those claims yourself. If they were right Newton would be leaping out of their graves to come back and check things out.

All trailers shipped from Duncan, Vancouver Island, British Columbia, Canada. See the ordering page for more information about how to purchase a Tony's Trailer.

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Phone: (250) 743-9915   |   E-mail Tony   |   2721 Christopher Road, Koksilah, British Columbia, Canada, V0R 2C0

All material within this site is © 2000-2018 by Tony Hoar. All rights reserved. Prices and specifications subject to change without notice. US currency conversions are estimates only.