Page 1 of 1

Jenex brakes eating my shoes

Posted: Sat Jun 03, 2017 10:28 am
by Neuro
No matter how I set the brakes, they will rub the shoes since they have to be relatively close in order to work, and the cuff has an edge.

Image

Image

I've tried to pad the brake cuffs, set them higher, lower, at an angle and all I could think of, but by its nature they will rub since the shoes protrude in a curve at the back.

Now it's getting out of hand and soon they will have cost me a good pair of boots. Realistically, I could probably have gotten the Rollersafe electric brake as these boots were pricey, but weren't made yet when I got them.

Any ideas? The Ski Skett brake has a roller at the top which might be a good idea for wear, but seems very narrow and might slip to the side. Don't know if I could trust it. I'm really just looking for a fix to the Jenex I have if possible.

Image

Re: Jenex brakes eating my shoes

Posted: Sun Jun 04, 2017 12:31 am
by Magnus Johansson
Neuro wrote:I've tried to pad the brake cuffs, set them higher, lower, at an angle and all I could think of, but by its nature they will rub since the shoes protrude in a curve at the back. Any ideas?

The brake arm is straight. It should be curved backwards leaving room for the ski boot.

Re: Jenex brakes eating my shoes

Posted: Sun Jun 04, 2017 11:20 am
by Neuro
It is curved, the picture above is just an illustration. But it doesn't help if it's curved as the whole backside will scrape the cuff during the pushoff, that's the problem.

Maybe I should make a custom roller thingy like the Skiskett and put on the Jenex? But how?

Re: Jenex brakes eating my shoes

Posted: Sun Jun 04, 2017 8:17 pm
by skiffrace
neuro wrote:Maybe I should make a custom roller thingy like the Skiskett and put on the Jenex? But how?

Dissassemble the vertical arm of Jenex brake. Using a piece of thick cardboard, pencil and razor, make a template of the same length and with bolt holes in the same locations, but one that properly curves, just like the Ski Skett.
Assemble the cardboard piece back on on the Jenex brake and check it leaves enough room for the boot.
Do you still have machine shops in Norway? As an alternate, you can try car repair shops. or maybe even some local vocational school has a mechanical shop. Take your cardboard template there, and ask how much it would cost to make something similar (2 pieces) from thick aluminium.
There is a small chance that one could cut out the vertical arm at home with a jigsaw, using a single piece of strong wood like oak, but most likely it would not be strong enough.
OTOH, unless you have a well-equipped shop at home (and you don't, otherwise you'd not ask this question), you need to go to a machine shop to cut aluminium.
After they give you a quote, see if it's worth it. Norway is an expensive country, with high labor costs. so it may be cheaper to just buy a new brake.
As a conclusion - don't buy Jenex.
Jenex products look good on a web page, but in reality, they lack the experience, refinement and quality of the established brands from the Nordic countries.

Re: Jenex brakes eating my shoes

Posted: Mon Jun 05, 2017 7:46 am
by Neuro
It's not really the arm that's the problem as much as the cuff itself which will scrape the boot. And you're right, the price to get simple things done in a machine shop here is exorbitant, I've commissioned something at work once. (to make a simple aluminum casing, just bend a plate into a box).

I guess as with most things for us 'shopless', it's easier and even cheaper just to buy some ready solution like the Ski Skett (seems to come with lights too :)), but should anybody come up with something I could easily customize the Jenex with (stirrup, bolt, piece of tube?), let me know.

About Jenex, it's actually founded by a Swedish-American (which is why decals are all blue and yellow), and I really respect getting the brake solutions early. Agree some things not ideal, but probably hampered by lack of testing and customer usage compared to Scandinavia.

Re: Jenex brakes eating my shoes

Posted: Mon Jun 05, 2017 9:24 am
by skiffrace
neuro wrote:It's not really the arm that's the problem as much as the cuff itself which will scrape the boot

The cuff scrapes the boot when you press the boot against it to apply the brake? Then you need to tinker with the cuff...change its shape, add/remove padding...
euro wrote:hampered by lack of testing

Exactly. They probably do a few quick rounds, decide it's 'good enough', and then apply the old method "our customers will test it for us".
I had their V2 Aero rollerskis back in 2000. They disintegrated (literally) after one year of light, weekend use. The V2 Aero model I currently have is sturdy and overbuilt. It lacks the refinement of similar German products, but at least it still works....

Re: Jenex brakes eating my shoes

Posted: Mon Jun 05, 2017 12:55 pm
by Neuro
It scrapes during pushoff (skating), and I've tried to have it all angles, higher and lower, and padded. The padding just hooks the boot as it becomes too thick.

The best I've come up with is to have it high, above the boot, so I have to push it with the leg. Then it doesn't hook, is immediate and full, but the scraping is the issue..

Re: Jenex brakes eating my shoes

Posted: Tue Jun 06, 2017 7:09 am
by skiffrace
So you've tried all the low-hanging fruit to no avail. Time for out-of-the-box solutions....
Example: buy a can of herring, eat the fish, throw away the can, save the metal top.
Round the top, so it matches the profile of the boot.
Attach the top to the boot the best you can (duck tape, double-sided carpet tape, zip-ties threaded through a few small holes...) in the location where the rubbing occurs.
If you pick a shiny-looking can of herring, your boots will get a classy stainless-still accent, and if it does not work at least you've eaten the herring...
Other than that, calculate what is cheaper - new brakes or a new pair of boots every now and then.

Re: Jenex brakes eating my shoes

Posted: Wed Jun 07, 2017 1:14 pm
by Neuro
The main issue here is that the 'throw' of the brake is limited when the contact point is higher than the boot, so I have to have it really close to the leg to get a reasonable effect, and any padding - and I guess the soft metal will be the same - will get caught on the upper part of the boot and that's not a nice feeling and can even be dangerous.

I can tolerate a soft scrape, but nothing that gets it closer, and I can't really adjust it back, so sort of stuck with it unless I can make a cuff that rolls like the Ski Skett.

Re: Jenex brakes eating my shoes

Posted: Fri Jun 09, 2017 3:18 am
by celestyx
You might want to try the Wahia brake from Skike (also exists from Fischer) : https://skike.com/en/shop/new-products/skike-wahia-rollerski-brake-for-any-ski-and-skike-rollers-all-brands-all-sizes-all-wheels-black-white_25.1121.1121.7044.html
Since the brake is attached to the shoe and not the rollerski, there is no additional weight on the rollerski which causes the rear wheel to hang, and because the brake follows your leg it might scrape less.
I have not used this brake but talked to a few people who have and I am considering buying one.

Re: Jenex brakes eating my shoes

Posted: Sat Jun 10, 2017 10:58 am
by Neuro
Cheers, that's interesting. Not quite sure how stable and reliable it is though. Seems it might easily become misaligned when you most need it. Would probably need 2 and then it gets pricey.
Would be interesting to hear some experiences.

Re: Jenex brakes eating my shoes

Posted: Mon Jun 12, 2017 7:03 am
by Michael_A
I find Jenex speed reducers work very well but they will only fit on Jenex roller skis.

Re: Jenex brakes eating my shoes

Posted: Tue Jun 13, 2017 11:21 am
by skiffrace
Neuro wrote: unless I can make a cuff that rolls like the Ski Skett.

Would that solve your problem? Do you have a drill at home?
If so, first determine the fore/aft location for the roller. Does the upper vertical arm of your Jenex brake already have holes in the right place? Otherwise, can you lightly bend the metal band that forms the cuff, so it can be used for the holes?
One way or another, use existing hole, or make a new hole with a drill and drill-bit for metal.
If the Jenex brake arm is made of steel, you are probably out of luck (hard to make a hole using DIY methods).
If it is aluminum, it should be quite easy - read on.
Measure the desired width of the roller. Leave ~1 mm on each size for the freedom of movement.
Go to a home improvement store and look for round piece of hardwood with diameter of 3-5 cm.
Also, buy a metal bolt with the diameter of you drill-bit - something ~4-6 mm, and similar width as the roller.
Cut the wood to the proper width. Make a hole through it with your drill.
Attach the roller to the arm of the Jenex brake using the bolt. Don''t worry about bearings, lubrication, etc. etc. As long as you use hardwood for the roller, it will be strong enough for occasional braking application.
Sorry if there something is not clear in the explanation above.
If by any chance you visit Tricity https://en.wikipedia.org/wiki/Tricity,_Poland, bring the brake with you - I will help you get this thing done.

Re: Jenex brakes eating my shoes

Posted: Sat Jun 17, 2017 12:01 am
by Neuro
Good idea but concerned the aluminum cuff ends might bend as the force on the brake is considerable on the steepest part of my run. I'll check it out.

But more and more considering the Rollersafe brake system as they work when wet and on both skis at the same time. (and don't eat boots). Only drawback is price and aluminum skis which might be too bumpy.