The problem with KTM 390 Adventure Fork Extenders from NiceCNC, Zmoke Vlogs and similar ones

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Unfortunately this type of fork extenders for the KTM 390 Adventure, extend the forks by 40 mm, NOT 1 inch (25.4 mm) as they were originally advertised all over the internet, nor 30 mm as mentioned in the promo video of Zmoke Vlogs, nor 1.26 inch (32 mm) as altered in the description on the NiceCNC website since January 31 2023.
See diagram: www.pinkbike.com/photo/24153284/
This 40 mm extension causes a problem in the bottom triple clamp:
In the standard position, the fork legs start to taper about 14 mm above the bottom triple clamp. Going from Ø 54 mm 14 mm above the bottom triple clamp, to Ø 51 mm just below the top triple clamp.
With the extenders mounted, the transition from the normal cylindrical clamping part Ø 54 mm on the fork leg, to the tapered part, is now located in the middle of the lower triple clamp.
This of course compromises the stability of the connection between the lower triple clamp and the fork leg, and could permanently deform both parts due to the uneven load that now acts upon them.

Пікірлер: 35

  • @RajeshZmoke
    @RajeshZmoke5 ай бұрын

    1 year - 20k kms later here i am still running the fork extenders without any issue.

  • @zombiewoof5257

    @zombiewoof5257

    5 ай бұрын

    Good for you. I hope you tell your buyers that they extend the forks by 40 mm, not 25 mm as in the original description.

  • @jonathanboudville2483
    @jonathanboudville2483 Жыл бұрын

    Thank you for pointing it out as I almost got the extenders after watching @Adv Matt’s video

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    You're welcome.

  • @roysyntageros4191
    @roysyntageros4191Ай бұрын

    I've had these on my bike for over 4 months now after a friend of mine recomended them to me. I pointed out this issue to him and he advised me technicaly that it was fine and will not cause any issues or damage!. Now, my mate is race car engineer with more than one PhD in engineering and works as a race director in the Australian Supercars championship. He is well trusted as a engineer and knows his stuff. He helped develop the Ford Mustang race car with Ford Performance USA. I say this as he is no back yard mechanic. If people want to try this go for it and see how it feels for you. IMO

  • @zombiewoof5257

    @zombiewoof5257

    Ай бұрын

    I just want people to be aware of the fact that the bottom clamps only clamp halfway. And sellers of these extensions should inform their buyer's too. There was only one seller of these extenders in Europe, in the UK. After a few months he suddenly didn't sell them anymore, I wonder why... And there isn't a single motorcycle manufacturer that would approve them.

  • @anony955
    @anony955 Жыл бұрын

    This is a good example of unintended consequences. I would seriously consider the risk:benefit on something like this.

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    For me the risk of permanently damaging or deforming something isn't worth the benefit. Maybe if I could fabricate some kind of wedge shaped shim to fill the gap, I might consider using such extenders.

  • @advmatt
    @advmatt Жыл бұрын

    I will take a look at that gap. Thanks for pointing it out. I will need to give it some thought to determine if this is a significant issue or not.

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    I decided not to use the extenders. Don't like the idea that the bottom clamps only clamp half of what they're designed for.

  • @guestappearance3211

    @guestappearance3211

    Жыл бұрын

    I raised my top tripple clamp by 9mm with a spacer under the tripple clamp, this means the forks now are only slid down 30mm not the 39mm they were when I first tried the install

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    ADV Matt, Why would you take the responsibility "to determine if this is a significant issue or not"? Are you qualified for that? Isn't it up to NiceCNC and other manufacturers of similar fork extenders, to inform their customers of all the facts, including the effect on the bottom triple clamp?

  • @advmatt

    @advmatt

    Жыл бұрын

    @@zombiewoof5257 I am only looking at it from my own experience. I am not speaking for the company. It is left up to the each rider/user/qualified mechanic of this product to determine if this gap creates an issue in functionality. It's great that you captured how the fork leg and triple clamp come together. Thanks for identifying it.

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    @@advmatt But when you're offering a 10% discount code, you're linked to the company and actively promoting their product. I'm a fan of your channel, don't let one video tarnish your reputation. I would at least put a disclaimer in the discription of your video, or pin a comment explaining the issue with the bottom triple clamp and the fact they extend the forks by 1.57 inch instead of 1 inch.

  • @advinjapan
    @advinjapan Жыл бұрын

    Hah, I can see I’m late to the party 😅. Very good catch!

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    Thanks!

  • @zombiewoof5257
    @zombiewoof5257 Жыл бұрын

    Today NiceCNC adjusted the description of their extenders, this time saying that they cause a 1.26 inch raise instead of 1 inch. This is still 0.314 inch to little, because they forgot to add the amount the fork legs protrube above the top triple clamp, in the standard position. Diagram of the extender www.pinkbike.com/photo/24153284/

  • @centruminzynieriidrogowej3275
    @centruminzynieriidrogowej3275 Жыл бұрын

    Hello, Have you figured out any way to securely mount those nice cnc fork extenders? Isn't it the case that the double screws on the clamps are there to prevent the forks from being pushed upwards? When using these extenders, the fork has no way to get up. I'd like to know your point of view on this. Regards

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    My point of view is that the designers of those extenders did a bad job. There's a reason that KTM designed the bottom triple clamp with two bolts on each side: It makes the connection more stable. I don't care that anyone uses the extenders, I just want people to know what the consequenses are.

  • @centruminzynieriidrogowej3275

    @centruminzynieriidrogowej3275

    Жыл бұрын

    @@zombiewoof5257 Thanks!

  • @scottporter0069
    @scottporter0069 Жыл бұрын

    Notice the gauge does not go deeper than the top bolts in clamp. :)

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    Indeed, but a thinner feeler gauge would have gone deeper. Everyone has to decide for themself ofcourse, but I'm not going to use the extenders, it doesn't feel right when the bottom clamp only clamps half of what it should.

  • @AlexandruGaal
    @AlexandruGaal Жыл бұрын

    using a thin aluminum strip between the for and the clamp, wouldn't help with this issue?

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    Yes it could help a bit.

  • @scottporter0069
    @scottporter0069 Жыл бұрын

    No more three mile long wheelies for you...

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    I wonder what insurance companies have say, when they find this kind of fork extenders on a KTM after an accident :-)

  • @scottporter0069

    @scottporter0069

    Жыл бұрын

    @@zombiewoof5257 Like all the other items on ebay. Probably just pay for OEM or don't bother. Stag happy..

  • @zombiewoof5257

    @zombiewoof5257

    Жыл бұрын

    @@scottporter0069 That's really good advice, but there are plenty of good aftermarket products, even on ebay, some even exceeding OEM quality and design. The problem is distinguishing between good and bad. And the amount of self proclaimed specialists, reviewers and influencers on the internet doesn't make it easier.

  • @advLunatic
    @advLunatic8 ай бұрын

    tighten a bit more to get the grip on fork.

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