27. July 2016 |

Here’s a collection of typical questions and answers to our products – have a look if your’s is among these :-)

Warranty / Guarantee

How is the warranty / guarantee procedure?

First of all, we are sorry to hear you have trouble with your QU-AX product.

In case of a warranty / guarantee claim, please always first contact your dealer, where you bought the product. The dealer is your contact person in terms of warranty and guarantee. He can check the product and, in case he cannot fix the issue by himself, contact us or send us the product. No matter if you bought it online or at the dealer next door. If the dealer is not near your home, please try to contact him by phone or mail first.

To assign a claim correctly, we need to get it back through the trader who bought it from us. We will then take care immediately of the matter.

Please also keep your buying proof ready, and in case your dealer is not near, please send him photos / a video of the issue.

Thank you for your cooperation.


I lost my bumper - is the Pogo now broken?

No, the rubber bumper is fixed very well – but the Pogos should, as described in the assembly instruction, only be used on tarmac or similar solid ground. When used on smooth ground or soil, the bumper can sink in – and get pulled of the pogo when jumping out again. We did not fix it more permanently to make it interchangeable in case of wear. Find the spare bumper here.

Can't I buy a 50 kgs Pogo for my child? It's only 30 kgs - but grows so fast.

That would be like if you would buy your child a pair of shoes 2 sizes to big or skis. It will not make fun! The spring is just to hard – your child will not be able to jump with it.

Do the Pogos only differ in terms of weight (spring-type)?

No, the Pogo-Sticks also have different lengths, adapted to the size of typical users. (Size between footrests and grips)


I cannot insert the seatpost as much as I want into the frame.

On Luxus unicycles, there is a second, 200 mm seatpost in the box – use that, shorter one. You can also shorten the seatpost with a common metal-saw. Make sure to file the ridge afterwards so that the post slides in the frame easily. Of course, seatposts are only available in different sizes for spare: in 200, 400 and 70 m length.

For what maximum weight are the unicycles made?

The clear answer is “it depends”. To learn or for simple riding you can say that OnlyOne and Luxus unicycles (both have square taper axle) are typically made for riders up to 75 kgs. For heavy riders, but also if you want to make hard tricks or play hockey, basketball or ride offroad or want to ride ride, or do jumps choose a unicycle with a multi-spline axle like ISIS or Q-Axle. This type of axle grants a safe connection between crank and axle that resits a lot more than a square taper axle.

Can I simply put an offroad tire on a Luxus unicycle?

The clearance of the frame will make this impossible. Also, a wider tire needs a wider rim. The Luxus frame crown has a small tire-clearance to make tricks possible where you have your feet on the frame-crown. Also, the axles of Luxus and OnlyOne are not made for hard offroad riding – only for regular riding.

Why does QU-AX shift towards a new Q-Axle standard and does not simply keep with ISIS-axles?

We know that for many unicycle riders would prefer to have a system that works with all other axles from other makers. However, many years ago, we made the first unicycle axle with the ISIS-standard, too. We were the first equipping unicycles with this axle interface. To progress, you have to leave standards behind. Bicycles are different, but many components from there deliver parts for our sport. The ISIS standard is long past on bicycles, 24 mm axles have taken over. The 2 mm more in diameter make the axle more rigid and allows to drill more of the inside out – which makes those axles lighter – and at the same time more robust. The outer diameter has stayed the same – so that Q-Axle hubs are compatible with ISIS bearing cups. The cranks get positioned at exactly the same place every time again whilst on ISIS-axles a conic interface gets worn over time and the position of the cranks wanders. A crank-extractor is not necessary anymore neither. Be assured that we will enlarge they lengths and shape of available cranks.

What type of seatclamp diameter do I need for my frame?

QU-AX Unicycles all come with a seatpost diameter of 25,4 mm. For our steel frames, you need a seatclamp with an inner diameter of 28,6 mm. For our QX-unicycles with aluminum frame, you need a seatclamp with an inner diameter of 31,8 mm. Kris Holm unicycles have a 27,2 mm seatpost and need seatclamps with an inner diameter of 31,8 mm.

My pedals keep getting loose, what can I do?

It is most important that pedals are properly tightened. That’s why it is important to check this regularly.
Since a unicycle can be ridden in both directions, it is also absolutely necessary to check wether the right pedal is on the right side and the left pedal is on the left side. Otherwise they get loose from simple riding. That is also the reason why the the right crank is tightened clowckwise and the left crank is tightened counter clockwise. Both for cranks and for pedals you can tell that if they have been ridden loose, at least one (the softer material) of both will be permanently damaged so that one of both or even both will have to be changed. (crank/pedal or crank/axle) which is one more good reason to check they are tightened well regularly. If you feel a connection is loose, stop riding and check it.

What unicycle size do I need? Which size can I ride?

In unicycling, the wheel-size is rather about what you want to do with the unicycle than with your overall-height. Typically, the 20″ unicycle is the classical learners-unicycle. With a voluminous 20″ or 19″ tire, it is a Trials-unicycle made for Muni, Trial or Street-unicycling. If 20″ is too big, there are also 16″ and 18″ unicycles. The 12″ unicycle is for very talented kids – or bigger ones who want to have fun. 24“ Unicycles are popular for basketball or for many IUF-disciplines. Off-terrain, 24″ unicycles with wide 3,0″ tires are made for downhill. 26“ unicycles are for longer distances or for competition when used with a thin race-tire. The 27,5“ Unicycles with a Mountain-Tire or even Plus-sized tire are universal Mountain-unicycles for municycling but also for downhill or Enduro. 29“ and 36“ unicycles are for long-distance.

Ob Du für ein Einrad groß genug bist, hängt von Deiner Schrittlänge ab – denn Menschen haben zum Teil bei gleicher Körpergröße unterschiedliche Proportionen, also längere Beine und kürzere Oberkörper, oder umgekehrt.

Die Schrittlänge misst Du barfuß – vom Boden bis zwischen Deine Beine. Am Besten stellst Du Dich dazu an eine Wand und hälst ein Lineal in Deinen Schritt an die Wand.
In den Artikelbeschreibungen unserer Einräder sind die jeweiligen Mindesschrittlängen jeweils vermerkt.

Can I put a brake on my unicycle?

Yes! There are two ways of doing this. The one possibilty is to mount hydraulic rim-brakes (Magura). The other way are discbrakes on unicycles. With disc-brakes, it is most popular do buy the unicycle equipped with it right away since the hub has to have a disc-interface and so does the frame (to put the brake-caliper on). With Magura-brakes, the frame has to have Magura-sockets (like our #1700 Muni does for example). And of course the brake should have a brake-surface. On the current range, the following unicycles are equipped with Magura-sockets by default: Muni 19“ (#1700) (for little downhillers), 24“ (#1711), 27,5“ (#1712), 29“ (#1713) and Profi Marathon 36“ (1019). To add a Magura, you need #2210 (Magura shell), #2216 (Magura brake) as well as #2036 (brake-lever-mount).

The 350 mm post on the Luxus does not fit.

The QU-AX Luxus comes with a short and a long seatpost in it’s carton. By default, the 200 mm one is assembled to the saddle. Sometimes, when trying to assemble the 350 mm one, it might seem it does not fit the bolts coming out of the seatbase. But in most cases, those are just stuck in the saddle-base from having been fixed. By gently hammering them, they have a little play and you will easily be able to put the 350mm seatpost on the base.

About Tires and rim sizes

It’s a bit complicated with the Tire-sizes of the unicycle. Same for bicycles – since mostly, their tires are used.

Tire sizes are mostly defined in Inches and with the Metric-system (ISO / ETRTO-size). A 20″x1,95″ tire has got an inner tire-diameter of 20″ (406 mm). It is specified with a width of 1,95″ (47 mm). Allthough this varies a lot according to maker and rim on which the tire is mounted on.

Here’s an overview with inch/ETRTO diameters:

12 1/2″: 203 mm
16″: 305 mm
18″: 355 mm
19″: 387 mm
20″: 406 mm
24″: 507 mm
26″: 559 mm
27,5″: 584 mm
28″ / 29″: 622 mm
36″: 787 mm

Besides these, today most popular sizes, there is still an “old” inch system, not writing the values after the comma in numbers but fractured like 12 1/2″ for example. Unfortunately, it is not as you might think the same like 12,5″. The only thing you need to remember here is the Brown’s Law of tire sizing:

If two tires are marked with sizes that are mathematically equal,
but one is expressed as a decimal and the other as a fraction,
these two tires will not be interchangeable.

(see also on sheldonbrown’s website: https://www.sheldonbrown.com/tyre-sizing.html)

In unicycling we get mostly asked for 19″ and 20″ – and the difference between them. That’s why we would like to tell a little bit more about wheel-sizing here:

20″ – ETRTO size 406 mm describes the diameter of the rim. 406 mm (20″) is also typical on children bicycles and on QU-AX Luxus and Profi 20″ for example. The QU-AX Muni Starter is also a real 20″ with an ETRTO-size of 406 mm.

Another size often called 20″ – is the 19″ size. Its ETRTO size is 387 mm. This size comes out of the bicycle-trial. There, wide and voluminous tires (at least 2,5″ or 67 mm wide) are wanted for rebound when jumping and for rim-protection upon impact.

The reason why they often call 19″ a 20″ tire is because in the US, the wheels are often defines through the overall-size, including tire. That’s why they sometimes call a wheel with a wide and fat 19″ tire a 20″ wheel. So our Muni Starter with the fat 20″ tire would then be called a 21″ – at least theoretically.

As already the different ETRO sizes might make you guess: 19″ and 20″ are not compatible with each other since they simply have a different size. So the best tip for you is to look after the ETRTO-size, this way you are sure to find a precise size.

It’s nearly the same for 29″. If you look at the ETRTO-size (622 mm), it is a 28″ wheel (622 mm ETRTO). But especially “fat” 28″ wheels like Muni-wheels (or on Mountainbikes called “Twentyniners”). 29″. Since the exterior diameter is rather a 29″ – allthough that is not on official size.

As already mentioned in the beginning, it’s a bit complicated with wheel sizes. More unicycle relevant examples:

Because a 24″ with fat tire (like on a 24″ Muni) is not called a 25″.
On Race unicycles, the IUF allows a 24″ unicycle for most competitions – but defines it with the exterior diameter (618mm) so with tire. In the beginning of unicycle-races the unicycles still had quite right 1,75 or 1,95 tires, that left quite lots of space between rim and limit. So one day, some racers tried to use a 26″ rim with a narrow racing-tire (lighter, less rolling resistance) – which still was within the regulation. So the rule says 24″ – but most race-unicycles, according the the rim size – are 26″ wheels.

Finally, there are three more criterias that are relevant on rims:

The spoke-holes – which have to be same as on the hub – the more, the more robust the wheel is, best around 36 holes – for extra-sturdy wheels even 48. On child unicycles less are okay, too (28 e.g.) since otherwise the wheel would have the spokes too near to each other.

The second one is the rim width. A wider rim is more solid – and is even needed for wider tires so that the tire does not “curve” to much.

And the third one is the rim-architecture: A double-walled rim is more sturdy than a single-walled rim.

What is the difference between OnlyOne and Luxus?

The OnlyOne unicycles have been designed so that they match our perception of quality, durability and design. The QU-AX Luxus unicycles are improved for higher needs in the following points:

  • a much more comfortable saddle with an integrated handle. Whilst the OnlyOne has just a foamed PU-saddle, the Luxus saddle is much more comfortable – for more great riding time
  • The Luxus has (except a 24″ and 26″) a flatcrown frame to put the feet on when riding tricks
  • the Luxus has a wider tire (1,95″ instead of 1,75″
  • The Luxus in 12″, 16″, 18″ has an ergonomic child saddle and ergonomic child pedals
  • The Luxus includes a second, short seatpost, this way, no need to shorten the seatpost with a saw

Penny Farthing

How tall do I have to be for being able to ride the Penny-Farthing?

You should be around 1,70 m – it depends on your inseam-length in the end. Then, you have to be a little bit handy when ascending, and if it is just for few centimeters, you can help by putting shorter cranks on.

Warum gibt es nur eine Bremse?

Eigentlich gibt es zwei Bremsen: die, die Du über den Hebel am Hinterrad ziehen kannst – und Deine Beine! Wir hatten einmal mit einer vorderen Bremse experimentiert – aber das führte schnell zu Überschlägen!

Where can I ride the Penny-Farthing?

You should ride it on tarmac or similar roads. It is NOT made for offroad-riding. It is also not made to ride steps or curbs. As it is not equipped with lighting-systems, you should not ride it on public roads.