Roller Skis

A Small Wheel World

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!

Advertisements

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.

Jan Ottosson’s Roller Ski History

jan-ottosson-pa-grimmer-rullskidor_2

Jan Ottosson at Åsarna Ski Stadium on his first pair of roller skis, the so-called “Grimmer rollers”. The ski boots, Thomas Suveren, are from around the same time as the roller skis, circa 1973. Photo: Henrik Ottosson

This is an interview with Jan Ottosson done 8th of June – 25th of August 2016. Swedish cross-country skier Jan Ottosson, born in 1960, is two times Olympic champion, several times Swedish national champion and four times winner of Vasaloppet. He is now a cross-country ski trainer at Fjällgymnasiet, a ski high school in Sweden. The interview was done in Swedish and translated into English by Magnus Johansson.

MJ: When did you start roller skiing, and for what reason? Had you been recommended to start roller skiing for ski training during the snowless season or was it your own initiative?

JO: I started roller skiing at my own initiative. I read about roller skis as a training device and became curious. I find [documented] that I roller skied when I was 14 years old; maybe I started the year before when I was 13. It was with the East German model of roller skis. Me and my 5 year older brother bought a pair each and started roller skiing.

MJ: Was it the so-called ”Grimmer rollers” (after the East German top cross-country skier Gerhard Grimmer) you and your brother acquired? What did you think of them? Did they give you the training you had hoped for? A common notion is that they did not give a very ski-like training.

JO: It was ”Grimmer rollers”. I was so young then so I do not know what they really were like, but anyway, I trained on them.

jan-ottossons-rullskidor_2

Some of Ottosson’s roller skis through the times. From front to back: “Grimmer rollers” (with ski boots), JEH, JOFA (wood shaft), JOFA (metal shaft), Edsbyn, and for modern reference Swenor Fibreglass. Photo: Jan Ottosson

MJ: Can you tell me more about those roller skis?

JO: It is so long ago, but I trained on them a couple of summers.

MJ: Who was the manufacturer?

JO: Don’t know.

MJ: What did they cost?

JO: Can’t remember.

MJ: What are the specifications? The difference in weight and size were big between front wheels and rear wheels to obtain a fair balance of the ski. Antenna wheels are used even today by Marwe. Did the ”Grimmer rollers” come mounted with NN-75 bindings?

JO: That is correct; they came with bindings mounted.

The roller skis in rear view. The Edsbyn roller skis had the wheels worn out and discarded so we had to estimate their wheel size.

The roller skis in rear view. The Edsbyn roller skis had the wheels worn out and discarded so we had to estimate their wheel size. Photo: Jan Ottosson

Jan measured his roller skis and the results are given below:

Grimmer Rollers”

Aluminum frame; aluminum, plastic and solid rubber wheels.

Wheelbase: 430 mm

Distance to antenna wheel: 485 mm

Front wheels gauge: 80 mm

Rear wheels gauge: 72.5 mm

Frame width: 125 mm

Frame thickness: 20 mm

Ground clearance: 26 mm

Front wheels: 115 x 15 mm

Rear wheels: 55 x 18 mm

Antenna wheel: 40 x 10 mm

Weight: 3200 g/pair

MJ: What type of roller skis were your next pair?

JO: I believe the next pair were Road-Ski but I am not certain. I also had Oddmund Jensen, Edsbyn and JOFA; all of these had three wheels.

JEH

Aluminum shaft; aluminum and solid rubber wheels.

Wheelbase: 810 mm

Shaft: 40 x 25 mm

Wheels: 120 x 15 mm

Gauge: 100 mm

Ground clearance: 50 mm

Weight: 2600 g/pair

JOFA (wood)

Wooden shaft, laminated; aluminum forks; solid rubber tires on aluminum rims.

Wheelbase: 840 mm

Shaft: 45 x 20 mm (narrower at the front)

Wheels: 90 x 22 mm

Gauge: 90 mm

Ground clearance: 42 mm

Weight: 3400 g/pair

JOFA (metal)

Aluminum shaft; solid rubber tires on aluminum rims.

Wheelbase: 840 mm

Shaft: 40 x 25 mm

Wheels: 110 x 20 mm

Gauge: 85 mm

Ground clearance: 42 mm

Weight: 2800 g/pair

MJ: After the three-wheel era of e.g. JEH and JOFA in the 1970’s and very early 1980’s, which ones were your first pair with barrel-wheels?

JO: I believe I had a pair of Svenskskidan. If I am not totally wrong, they were the first roller skis with that type of wheels.

MJ: So barrel-wheels on roller skis is a Swedish invention or original construction?

JO: Hans Person from Småland, Sweden, got a pair of test roller skis from Sivert Höök, (I am a little uncertain of his name) also from Småland, and Hans then started Svenskskidan. I worked in the summer of 1983 in Vålådalen in Jämtland and got to test these new roller skis on gravel roads. They had wide wheels that coped well with the uneven surface of those roads. Svenskskidan later became what is known today as Elpex.

Edsbyn

Aluminum shaft, solid rubber wheels.

Wheelbase: 840 mm

Shaft: 40 x 25 mm

Wheels: 80(?) x 60(?) mm

Ground clearance: 28(?) mm

Weight: 3800(?) g/pair

MJ: Regarding development of other equipment, was there some detail that you remember particularly improved roller skiing?

JO: The pole tips became better over time.

MJ: How appreciated was roller skiing among elite skiers during your junior and early senior years? Did it go without saying to train a lot of roller skiing in the bare ground season? How much did you train? Or were there many with the same attitude to roller skiing as Sixten Jernberg who thought it might be good for poling training but that he rather ran instead?

JO: We trained on roller skis about 30-40 % of the training time (1976-1980). Running dominated the training. Later, when skate skiing came, the time on roller skis increased. When I started with the Grimmer rollers I didn’t roller ski that much but trained running and pole running and other things. It is likely not possible to compare the roller skis of Sixten’s time to what we have now, and it is not only the roller skis that have developed, it is all equipment and, for example, the access to roller ski courses.

MJ: That you trained more on roller skis when skate skiing came, was that because the new technique had less in common with running and pole running?

JO: Skate skiing was a new way of skiing and a new activity to train and therefore it automatically meant more roller skiing. We started with the one-legged skate on classic roller skis and then when skate roller skis came we could use real skate skiing technique.