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Hub Axle Configurations

Which hub-axle configuration will I need?

In the past, it was quite easy to determine which axle is used on the front and rear hub of your mountainbike or road bike. Your road bike normally had a front hub with an OLD* of 100 mm and a hole for the quick release of 5 mm. The corresponding rear hub would be 130 mm and it would have the same 5 mm hole for the QR. The front hub for your mountainbike would have the same dimensions as your road bike and the OLD of the rear hub would be a bit larger, 135 mm. Only for Downhill-, Freeride and hardcore Gravity-Bikes there were some exceptions existing.  Trekking-, ATB- and (Cyclo-)Cross-Bikes were sometimes more MTB- and sometimes more roadbike related, so that the width of the rear hub claimed some extra attention.

With the entry of the disc brakes in combination with suspension forks and the gear systems with 11 or even 12 sprockets, it became clear that the traditional axle standards were no longer sufficient for maintaining the stiffness of wheels and frames and for creating space for the increasing amount of gears. Several new axle standards were introduced and we can imagine that it’s not always easy to determine which configuration of the CAMERIG44 , RANDA35 or HOUFFA25 fits in your bike. We hope this overview makes it easier to understand!

The Road Bike – rim brakes

The majority of the road bikes with rim brakes are still equipped with “traditional” hubs. These hubs make use of a 100mm wide front axle and a 130 mm wide rear axle. The hole in the axles offers space for the 5 mm wide quick release. CAMERIG44 and RANDA35 wheels for rim brakes come standard with these hubs.

The Road Bike – Disc brakes

We can imagine that you have doubts about which CAMERIG44 Disc hub configuration to choose for your road bike. Although it might seem tricky, it’s quite easy to explain. The current complexity around this topic is created by many different types of axles, which belong to the frame or to the fork  (= different  threads) but will NOT affect your wheel/hub decision.

In a another chapter, we have already explained why we think it’s best to combine disc brakes with through axles. That’s why we only offer these configurations actively on our site.


If your road bike with disc brakes is equipped with through axles, you can assume that your rear hub as a width of 142 mm and that the axle has a diameter of 12mm.


The front hub of road bikes with disc brakes + through axles will have a width of 100mm. Until recently the axle always had a diameter of 15 mm, but we are seeing a trend towards 12mm at the moment. You will notice that we offer both versions for our CAMERIG44 DISC.

Should you be in doubt about the axle diameter needed for your bike, you can measure the hole in the axle of your current wheels:

Which option do I choose in the online store?

  • 15 mm front axle à [15 mm front / 12 mm rear]
  • 12 mm front axle à [12 mm front / 12 mm rear]

It can be the case that your road bike with disc brakes is equipped with traditional hubs with quick releases. We are of course able to build CAMERIG44 DISC wheels for these bikes as well. If you need disc wheels for traditional quick release hubs, please mention the following in the comments box while placing your order:

“5 / 100 mm QR front hub” & “5 / 135 mm QR rear hub”

The mountainbike – disc brakes

The explanation for road bikes with rim or disc brakes is fairly easy to follow, but the incredible fast developments for mountainbikes the past few years have caused a big increase in available hub standards. Since the HOUFFA25 wheel set is designed for cross country and marathon, we will only cover the relevant hub standards in this explanation.

For the road bikes the OLD of the hub became clear based on the compatibility with through axles or standard quick release, but for mountainbikes this rule cannot be used. There are not only different axle standards, but also different OLD’s in use. We can virtually equip the HOUFFA25 wheels with any of these hub standards, but for you it might be a challenge to find out which hubs you need. That’s why we came up with this guide. As already mentioned in the context of the road bike hubs, you can ignore the actual Axle Specification (X-12, E-Thru, Maxle…), which are related to the used threads, while choosing the correct wheels, because the axles belong to the frame and fork.-

If you have doubts about which hubs you need for your bike, then measure the following:

1. The OLD of the rear hub.

Because the axle is hollow, you can stick a long screw driver or Allen key through the axle until it almost sticks out on the other end. Mark the screw driver or Allen key on the other side and measure the length from the beginning until the mark. In most cases this will either be 142mm or 148 mm (=BOOST).

2. The OLD of the front hub

Proceed similar to the rear hub with the help of a long screw driver or Allen key. In most cases this will either be 100 mm or 110 mm (=BOOST).

Special Cases:

- REAR: If you own a Cannondale with an asymmetrically offset rear triangle and drivetrain (AI), please write a note about this in the comments field while placing your order.

- FRONT: If you have a mountainbike is equipped with a RockShox RS1 fork, you need a hub for “predictive steering”.  Please add a note about this in the comments field while placing your order.

- FRONT: If you have a mountainbike with a Cannondaly Lefty fork, please contact us to make sure that we use the correct hub for your front wheel.

Front and rear – quick release

If your mountainbike has traditional quick releases, it’s quite certain that your front hub has an OLD of 100mm and that the diameter of the axle of the QR is 5mm. Rear hubs which are fixed in the frame with a traditional quick release, normally have an OLD of 135mm. Of course, we are also able to build this configuration for you. If you need HOUFFA25 wheels for traditional quick release hubs, please mention the following in the comments box while placing your order:

“5 / 100mm QR front hub” & “5 / 135mm QR rear hub”


*Over-Locknut-Dimension: The distance between the outermost locknuts of a conventional hub axle, or whatever equivalent parts fit against the inside surfaces of the fork ends of a frame. They must match the spacing of the frame that the wheels are to be installed in.