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Mounting your inline boot on an ice blade? Why that doesn't fit (unfortunately)

29 Dec 2020
by Diederik Hol, Geert Plender

Speed skating and inline skating are two different worlds

Speed skating and inline skating, it is almost the same. Well, it seems like that. Everyone who combines those two sports knows that there are more differences than you would think of at first. The Netherlands is one of the few countries in the world where people combine speed skating in winter with inline skating in the summer or the other way around. Inline skating originates from roller skating, a sport that is popular in southern Europe and South-America. The development of inline skate equipment didn’t keep up with the developments in speed skating, which has a long tradition in northern Europe. It explains a lot of the below described technical differences.

Inline skating in year 2000 VS 2020

Image 1: The evolution of inline skates and the size of the wheels.

Big inline skate wheels

Speed skating and inline skating basically went separate ways when we started to ride on bigger inline skate wheels. In the eighties we used 76mm wheels, nowadays it is almost double, 125 millimeters. A huge difference!

Development of inline skates from 80 to 110mm

Image 2: With the development of using 4 bigger wheels in your inline skates instead of 5 smaller ones, the mounting distance changed from 165mm to 195mm. Pictured is the Cádomotus dualbox6 with 4x110mm wheels and a Mogema M55 with 5x80mm wheels.

The biggest step in this development was that we switched from 5x84mm wheels to 4x100mm. As a result, the second and third wheel interfered with the mounting points on the boot. To be able to attach the inline skate frame to the boot, manufacturers had to extend the difference between those mounting points, from 165mm to 195mm. The front mounting point is placed underneath your toe, the same point where the hinge of the clap skate is placed. Since that moment a speed skate blade doesn’t fit under an inline skating boot anymore. 

An inline boot doesn't fit on an ice blade


Image 3: An inline skate boot with a 195mm mount doesn’t fit well on a clap skate. The front mounting point is placed 30mm too far ahead. You also assemble your inline skate boot from the bottom (from the frame underneath) and the speed skate from above (from within the shoe).  

Mounting an inline frame or an ice blade comparison

Image 4: The attachment of the inline skate frame differs from the attachment of a speed skate blade.

Attachment of speed skate and inline skate boots

Before the mount of inline skates changed there was already not a lot of room. The so-called mount of a skate shoe is not standardized but grows with your foot. That’s logical because you want your mounting points under the ball and heel of your feet. That’s where you can put the most pressure and that’s where the pressure will be most efficiently transferred to the ice floor. 

Transferring push off power in a skating shoe

Image 5: The mounting points located underneath the heel and the ball of the foot are the most efficient.

The mount of a speed skate boot increases per shoe size by 5mm. From 140mm for a European size 35 (foot length 225mm) to 190mm  for size 47 (foot length 300mm). When your feet get bigger, the length of the blades will increase. With shoe size 40 you will have approximately a 16,5” blade and with size 45 a 17,5” (this is measured in inches - and not in centimeters – adapted from short track, to make it easier).

Who really wanted to use their inline skate boots for ice skating, had to have some luck. An old inline skate boot with a 165mm mount fitted only a blade that matches a shoe size 40/41.

Mounting inline boots and ice boots compared


Image 4: Inline boots have a steady mount of 195mm for every size and you can adjust in length (from front to back). Ice speed skating boots have a different mount (150-190mm) for every shoe size. The ice speed skating boots have also a lateral slide slot instead of a longitudinal slide slot.


Mount from within the shoe or the other way around

Another reason why it doesn’t work to use your inline boot for both seasons is that the way the frame is mounted to the shoe is different.

You have to attach an inline skate frame from the bottom with an M6 screw. A speed skating blade you have to attach from the inside with an M5 screw. In the case of the speed skating blade, there is no other option. Under the heel, there is a slot in which the clap skate falls. There is no room to screw from the bottom of the shoe upwards.

Inline boots do have that room. That's why we choose there for the most logical choice. The M6 screw is attached from the bottom in an aluminum mounting point. That gives some extra stability and strength. This is valuable for inline boots that are exposed to more force because of rough roads for example.


Adjust your skates or inline skates

Most speed and inline skates are adjustable in two directions: from the front to the back or from the inside to the outside. That’s how you place the frame under your foot so you can put the right amount of pressure on it (front/back) and can steer precisely (inside/outside).

For speed skates, the width adjustment is located in the shoe, for inline skates, it is in the frame. This is a typical example of two worlds that are developed separately from each other. It should be possible to assemble inline skates the same way as speed skates though.


Can it be different?

It can be different. Now we use 3x125mm wheels the 195mm mount of inline skate boots is not necessary anymore. It would seem logical to bring back the mount to 165mm. In that case, certain sizes of speed skate frames should fit again. But that’s not going to happen soon. Inline skate races on the track throw a spanner in the works. It is prohibited to ride on the track with 125mm wheels so athletes choose a 4x110 frame. And so a 195mm mount.

So it’s possible, but it probably won’t happen. We only looked at the practical points. In our next blog, we will look into the functional differences between inline skate and speed skate boots.