Roller Skis

A Small Wheel World

Fischer Turnamic Skiroller

This year, Fischer has launched its Turnamic roller ski binding called Turnamic Skiroller (like they say in German). It is just like Rottefella’s latest roller ski binding, Rottefella Rollerski, a screw mounted binding, a rugged construction that shall withstand the strain of roller skiing. Unlike Rottefella Rollerski it is a binding with two separate parts and 7 screws instead of 4. The screws have the Torx screw drive which is a little odd when considering the standard ISO 7794 that prescribes Pozidriv. The binding has also a new screw hole pattern not seen before.

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Fischer Turnamic Skiroller Skate

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Russian Roller Ski Brands

Yesterday I discovered on the Internet the Russian roller ski brand Klinsport so I wrote to the company for more information about it and for information about Russian roller ski brands in general. Klinsport’s director Vladimir Nikiforov answered and was very helpful so now I have been able to add eight Russian roller ski brands to my page Active Brands. Check them out!

Mounting Roller Ski Bindings

Since “mounting roller ski bindings” has been the top search on this site lately I think it is appropriate to write an article about that, i.e. mounting roller ski bindings.

According to me, roller ski bindings shall be mounted just like cross-country ski bindings, that means on or some centimeters behind balance point. This is so because the maneuverability is best in most situations that way. For the free style equipment the jaw of the binding should be on the balance point of the ski, and for the classic style equipment circa 1 or 2 centimeters behind.

When skating it is advantageous to have the ski level to the ground when it is lifted, and then landing flat when a new stride is beginning. In classic style skiing, and especially when doing the diagonal technique, it is advantageous to have the ski a little tip-heavy so the tip (or front wheel) of the ski easily stays in contact with the snow (or ground) and thereby is easier to direct.

However, many roller skis today are too short to allow for balance point or behind balance point mounting of the bindings if one has larger ski boots than EU 40. This is particularly so on skating roller skis where even EU 37 can be impossible to balance point mount without the heel colliding with the back wheel or its fender. On these roller skis one is often forced to mount the binding in front of the balance point making the roller ski tail-heavy when used. I think roller skis, just like skis, shall be adapted to the length of the skier and thereby also to the size of his or her ski boots, and this is also a principle I follow when building my roller skis.

Prototype 3

The first pair of the third prototype of my “off-road” skate roller skis is ready for testing after bindings are mounted. Here are the specifications:

Shaft: Solid birch, 44 x 25 x 580 mm (width x height x length), 360 g.

Forks: Aluminum alloy, 3 mm thick, 250 g/pair.

Wheels: Pneumatic, 47-93 (7 x 1 3/4) with plastic rims and Cheng Shin tires inflated to the maximum 36 PSI, 1 020 g/pair.

Wheelbase: 770 mm

Ground clearance: 30 mm

Total weight: 1 630 g (3 260 g/pair)

The wheels are actually 41 mm wide and not the nominal 47 mm.

This pair of roller skis are made for ski boot sizes 40-43 and for weights 75-85 kg. I am very pleased with how they look and feel. Let’s see how they perform when used.

Rottefella Roller Ski Binding 2017

After the problems with NIS bindings on roller skis, Rottefella launches next year a new roller ski binding with direct screw mounting. Apart from the latticed design and the different bail, the new screw placement is the most conspicuous feature. Yet another “standard” for screw hole allocation on ski bindings. The design is a blend between the old binding model R3, the separate Xcelerator mounting plates and the Xcelerator binding itself. It looks distinct and modern but I believe the many cavities will gather dirt. https://www.flickr.com/photos/skinord/30396060881/

Rottefella Appeals the Prolink Verdict but CEO Quits

Rottefella decided in September to continue its legal fight against Amer Sports over the Prolink binding system. Rottefella believes the first court decision by Oslo District Court is wrong and the company is especially discontent with the court’s nullification of the two patents. However, Rottefella’s CEO Christer Johnsen did recently, on 18th of October, leave his position but the reason for that has not been publicly revealed.

Cross-Country Screwdriver

The screwdriver par preference in relation to cross-country skis and roller skis is the Pozidriv screwdriver, and especially one with a tip of size 3 of that type, abbreviated  PZ3. That is so because of an international standard called ISO 7794 which specifies that screws of the corresponding screw drive and size shall be used for cross-country ski bindings. It is important not to confuse the Pozidriv with another cruciform screw drive, namely the perhaps more common and similar looking Phillips screw drive, so one uses the right tool when mounting, unmounting or adjusting bindings. The Pozidriv screwdriver has not only wings of a slightly different design than the Phillips screwdriver but more easily recognized a sharp edged rib between each and every wing which the Phillips screwdriver does not have.

PZ3

Pozidriv 3 (PZ3) screwdriver tip. Notice the sharp ribs between the wings.