Linkage fork

Related:
Forks
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK
Edited Date/Time 2/7/2022 3:57am
https://www.youtube.com/watch?v=slG8jz6UXZ0

Here is a titanium linkage fork video but I dont see any links to follow. Looks alright but again no info. Looks like it kinda takes off from where the Funny Fork underachiever machinist left off.
1
|
Oakhills
Profile picture for user Oakhills
Posts
6
Joined
11/23/2020
Location
Oakland, CA US
Oakhills 4/26/2021 9:38am
4/26/2021 9:38am
Crazy!
jason.west.750 4/26/2021 10:38am
4/26/2021 10:38am
Looks pretty good. Seems very active.
TomJones
Profile picture for user TomJones
Posts
28
Joined
9/22/2015
Location
San Jose, CA US
TomJones 4/26/2021 11:46am
4/26/2021 11:46am
Also, be VERY careful when googling eternity titanium at work! Shocked
3
Kusa
Profile picture for user Kusa
Posts
277
Joined
6/25/2010
Location
CH
Kusa 4/26/2021 12:43pm
4/26/2021 12:43pm
I would be curious if there is actual disadvantage when it comes to riding in pretty dense terrain with a lot of obstacles on sides. Also same for when the fork is getting more into the travel and so the layout is getting towards the terrain making it prone to hit? I definitely rode some trails where it would not pass.
kuzlich
Profile picture for user kuzlich
Posts
34
Joined
11/3/2011
Location
Lisichansk UA
kuzlich 4/26/2021 11:37pm
4/26/2021 11:37pm







MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 4/27/2021 7:40am
4/27/2021 7:40am
kuzlich, prototype pics? Any other info, and thx for the pics as it looks pretty intriguing.
kuzlich
Profile picture for user kuzlich
Posts
34
Joined
11/3/2011
Location
Lisichansk UA
kuzlich 4/27/2021 7:59am
4/27/2021 7:59am Edited Date/Time 4/27/2021 9:42am
MXBREWSK, yes, this is a working prototype. The author is from Ukraine. For a long time, he has been making all sorts of axles and links from titanium and got the idea to make his own fork. As you can see, he did it. In the future he plans to establish a small production line. But so far, he has not made any announcements so as not to stir up excitement, which he will not be able to satisfy.
1
Primoz
Profile picture for user Primoz
Posts
4554
Joined
8/1/2009
Location
SI
Primoz 4/27/2021 8:41am
4/27/2021 8:41am
Hm, why is it right-sided? This way the brake works in reverse, which is less than optimal - the PM mounting system for mountain bikes is not radial, it's offset a bit, which means the braking action pushes the caliper axially into the adapter, increasing the friction between them and causing less of a load on the bolt. If you reverse the rotating direction (like here), all the load is carried by the bolt.
Storge
Profile picture for user Storge
Posts
6
Joined
11/23/2010
Location
HR
Storge 4/27/2021 9:02am
4/27/2021 9:02am
Primoz wrote:
Hm, why is it right-sided? This way the brake works in reverse, which is less than optimal - the PM mounting system for mountain bikes is...
Hm, why is it right-sided? This way the brake works in reverse, which is less than optimal - the PM mounting system for mountain bikes is not radial, it's offset a bit, which means the braking action pushes the caliper axially into the adapter, increasing the friction between them and causing less of a load on the bolt. If you reverse the rotating direction (like here), all the load is carried by the bolt.
It's a lefty.
Storge
Profile picture for user Storge
Posts
6
Joined
11/23/2010
Location
HR
Storge 4/27/2021 9:06am
4/27/2021 9:06am
Primoz wrote:
Hm, why is it right-sided? This way the brake works in reverse, which is less than optimal - the PM mounting system for mountain bikes is...
Hm, why is it right-sided? This way the brake works in reverse, which is less than optimal - the PM mounting system for mountain bikes is not radial, it's offset a bit, which means the braking action pushes the caliper axially into the adapter, increasing the friction between them and causing less of a load on the bolt. If you reverse the rotating direction (like here), all the load is carried by the bolt.
Storge wrote:
It's a lefty.
Oh, didn't see the vid. Sorriez
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 4/28/2021 11:25pm
4/28/2021 11:25pm
kuzlich wrote:
MXBREWSK, yes, this is a working prototype. The author is from Ukraine. For a long time, he has been making all sorts of axles and links...
MXBREWSK, yes, this is a working prototype. The author is from Ukraine. For a long time, he has been making all sorts of axles and links from titanium and got the idea to make his own fork. As you can see, he did it. In the future he plans to establish a small production line. But so far, he has not made any announcements so as not to stir up excitement, which he will not be able to satisfy.
Well this kinda shot down the hope of a production version in the thread. Seems to be the same as the funny fork, prototype only, and probably no future. Not a dig on you kuzlich, but it doesn't seem too optimistic for a future product we can try.
kuzlich
Profile picture for user kuzlich
Posts
34
Joined
11/3/2011
Location
Lisichansk UA
kuzlich 4/29/2021 12:08am
4/29/2021 12:08am
MXBREWSK wrote:
Well this kinda shot down the hope of a production version in the thread. Seems to be the same as the funny fork, prototype only, and...
Well this kinda shot down the hope of a production version in the thread. Seems to be the same as the funny fork, prototype only, and probably no future. Not a dig on you kuzlich, but it doesn't seem too optimistic for a future product we can try.
The author is optimistic. I think that something in the form of custom production can work out. Moreover, we have examples of such projects when a real product grew out of the idea of a couple of people. Garbaruk chainrings, titanium frames from Tritonbikes, great Trailmech hubs.
All this appeared on the naked enthusiasm of people and is now in good demand. Of course, a lot of startups died on takeoff, but...
1
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 11/16/2021 5:16am
11/16/2021 5:16am
MXBREWSK wrote:
Well this kinda shot down the hope of a production version in the thread. Seems to be the same as the funny fork, prototype only, and...
Well this kinda shot down the hope of a production version in the thread. Seems to be the same as the funny fork, prototype only, and probably no future. Not a dig on you kuzlich, but it doesn't seem too optimistic for a future product we can try.
kuzlich wrote:
The author is optimistic. I think that something in the form of custom production can work out. Moreover, we have examples of such projects when a...
The author is optimistic. I think that something in the form of custom production can work out. Moreover, we have examples of such projects when a real product grew out of the idea of a couple of people. Garbaruk chainrings, titanium frames from Tritonbikes, great Trailmech hubs.
All this appeared on the naked enthusiasm of people and is now in good demand. Of course, a lot of startups died on takeoff, but...
Kuzlich, after extensive conversation via translation on WhatApp, I have purchased his latest version of this fork and anticipate delivery in a month. After your last post I took it upon myself to pursue contacting him on YouTube and discussing the fork on the WhatsApp that he suggested. He did add a floating brake system and modified the bottom swingarm to a extensively milled version that will accommodate the floating arm system. The top clamp that attaches to the steering stem is also different for weight savings it appears. The axle is a straight 25mm diameter which will require a hub change as my Hope cannot be modified to fit the size. The build is all titanium and aluminum. The weight with an air shock should be near the weight of downhill 40 FOX forks. I am really looking forward to this fork arriving and then fitting it with the correct air shock. I will probably use a Rock Shox with the MegNeg as the rate is supposed to be quite linear, to which Vitaliy agreed was a good choice. I thought about a spring shock, and may still use one, but the extra weight is not what I want. Vitaliy the owner was very good to deal with, although the WhatsApp translations were sometimes not the best, be we were able to work through it. I am currently talking to a local carbon fiber designer to make a custom guard which will fit the swingarm bottom and side to protect it from scarring as this arm will be quite susceptible to harm falling on the right side. I have included a pic of the swing arm that Vitaliy sent me and was on his Instagram. When I get the system I will post on this thread pics of it. I am not sure how long the build will take as supply chain issues for getting the correct shock are suspect at the moment. This will be a fun addition and I look forward to making it work to its best abilities.
4
kuzlich
Profile picture for user kuzlich
Posts
34
Joined
11/3/2011
Location
Lisichansk UA
kuzlich 11/16/2021 6:16am
11/16/2021 6:16am
MXBREWSK wrote:
Kuzlich, after extensive conversation via translation on WhatApp, I have purchased his latest version of this fork and anticipate delivery in a month. After your last...
Kuzlich, after extensive conversation via translation on WhatApp, I have purchased his latest version of this fork and anticipate delivery in a month. After your last post I took it upon myself to pursue contacting him on YouTube and discussing the fork on the WhatsApp that he suggested. He did add a floating brake system and modified the bottom swingarm to a extensively milled version that will accommodate the floating arm system. The top clamp that attaches to the steering stem is also different for weight savings it appears. The axle is a straight 25mm diameter which will require a hub change as my Hope cannot be modified to fit the size. The build is all titanium and aluminum. The weight with an air shock should be near the weight of downhill 40 FOX forks. I am really looking forward to this fork arriving and then fitting it with the correct air shock. I will probably use a Rock Shox with the MegNeg as the rate is supposed to be quite linear, to which Vitaliy agreed was a good choice. I thought about a spring shock, and may still use one, but the extra weight is not what I want. Vitaliy the owner was very good to deal with, although the WhatsApp translations were sometimes not the best, be we were able to work through it. I am currently talking to a local carbon fiber designer to make a custom guard which will fit the swingarm bottom and side to protect it from scarring as this arm will be quite susceptible to harm falling on the right side. I have included a pic of the swing arm that Vitaliy sent me and was on his Instagram. When I get the system I will post on this thread pics of it. I am not sure how long the build will take as supply chain issues for getting the correct shock are suspect at the moment. This will be a fun addition and I look forward to making it work to its best abilities.
Gratz with your purchase!
1
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 11/16/2021 3:48pm
11/16/2021 3:48pm
Kuzlich, and just so you know, he is sending me a Trail Mech hub that will fit the axle, like you stated on your post.
kuzlich
Profile picture for user kuzlich
Posts
34
Joined
11/3/2011
Location
Lisichansk UA
kuzlich 11/16/2021 11:09pm
11/16/2021 11:09pm
Great choice. Guys make great quality hubs for relatively little money. I use one of their rear hub, very happy.

1
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 12/14/2021 9:03am
12/14/2021 9:03am
Kuzlich, Vitaliy from Eternity Titanium sent me some pics of the finished parts. Beautiful work!!

1
kuzlich
Profile picture for user kuzlich
Posts
34
Joined
11/3/2011
Location
Lisichansk UA
kuzlich 12/14/2021 12:58pm
12/14/2021 12:58pm
MXBREWSK wrote:
Kuzlich, Vitaliy from Eternity Titanium sent me some pics of the finished parts. Beautiful work!! [img]https://p.vitalmtb.com/photos/forums/2021/12/14/11687/s1200_thumbnail_IMG_20211214_WA0000.jpg[/img] [img]https://p.vitalmtb.com/photos/forums/2021/12/14/11686/s1200_thumbnail_IMG_20211214_WA0001.jpg[/img]
Kuzlich, Vitaliy from Eternity Titanium sent me some pics of the finished parts. Beautiful work!!

Too sxy content!
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 12/21/2021 8:35am
12/21/2021 8:35am
MXBREWSK wrote:
Kuzlich, Vitaliy from Eternity Titanium sent me some pics of the finished parts. Beautiful work!! [img]https://p.vitalmtb.com/photos/forums/2021/12/14/11687/s1200_thumbnail_IMG_20211214_WA0000.jpg[/img] [img]https://p.vitalmtb.com/photos/forums/2021/12/14/11686/s1200_thumbnail_IMG_20211214_WA0001.jpg[/img]
Kuzlich, Vitaliy from Eternity Titanium sent me some pics of the finished parts. Beautiful work!!

kuzlich wrote:
Too sxy content!
Kuzlich, more pic's. These pic's include another fork in black also, mine is the silverish color. Titanium fasteners are beautiful also!!



1
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 12/21/2021 8:38am
12/21/2021 8:38am Edited Date/Time 12/21/2021 8:40am
Here is a photo from the video that I cropped the messaging and have just the photo. Strange looking fork but I am totally looking forward to getting it mounted on my hardtail Nukeproof, then ordering a suspension frame with gearbox for a build. This was the prototype fork without the floating brake system.

MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 1/1/2022 5:27pm
1/1/2022 5:27pm
Primoz wrote:
Hm, why is it right-sided? This way the brake works in reverse, which is less than optimal - the PM mounting system for mountain bikes is...
Hm, why is it right-sided? This way the brake works in reverse, which is less than optimal - the PM mounting system for mountain bikes is not radial, it's offset a bit, which means the braking action pushes the caliper axially into the adapter, increasing the friction between them and causing less of a load on the bolt. If you reverse the rotating direction (like here), all the load is carried by the bolt.
Primoz, since I will soon have this fork, is it detrimental that the caliper is reversed on the right side? And what kind of issues does it cause besides the mounting bolt being loaded? Thank you for any info.
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 1/1/2022 5:34pm
1/1/2022 5:34pm

Primoz, here is a pic I forgot to add, there will be an extension mount added to the floating brake arm also.
1
Primoz
Profile picture for user Primoz
Posts
4554
Joined
8/1/2009
Location
SI
Primoz 1/2/2022 6:23am
1/2/2022 6:23am Edited Date/Time 1/2/2022 6:27am
I definitely wouldn't like it and would prefer it on the other side (at the end of the day, what prevents doing a left-sided fork? I was thinking about this a while ago as well).
Maybe look for a beefier IS to PM adapter so you don't suffer any issues there. I doubt you'll find a steel one though.

The M6 bolts won't be much of a problem mounting the caliper, the catch is more that bike calipers are designed to be pushed into the mount instead of being held back only by the friction between the caliper and the mount with radial mounting (with the friction generated by the bolt).

The pads should be fine I suppose, they are mostly all symmetrical, so there shouldn't be any weird loads, trying to eject the pads I suppose.

If it was me, I'd be checking the bolts, their tightness mostly, relatively regularly and observe if there is any cracking (this would be something further down the line, as aluminium starts cracking with enough cycles), both on the PM_IS adapter and on the caliper. But it's likely it will be fine. I'd still prefer it on the left side, like it's supposed to be though Smile

Check your hub too, 240s & co hubs from DT swiss have the mounting holes on the individual 6-bolt posts offset a bit, so there's more material behind the hole. Rotating it changes this too. Judging by the included picture, I think it's symmetrical with the hub you are getting with the fork.

BTW, where does the rod for the floating brake adapter mount to? There aren't any collars in that area.

And on a different note, will you play around with the antisquat ratios (by modifying the rod length) and the axle to crown distance (by moving the shock mounting collar)?
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 1/2/2022 8:46am
1/2/2022 8:46am
Primoz wrote:
I definitely wouldn't like it and would prefer it on the other side (at the end of the day, what prevents doing a left-sided fork? I...
I definitely wouldn't like it and would prefer it on the other side (at the end of the day, what prevents doing a left-sided fork? I was thinking about this a while ago as well).
Maybe look for a beefier IS to PM adapter so you don't suffer any issues there. I doubt you'll find a steel one though.

The M6 bolts won't be much of a problem mounting the caliper, the catch is more that bike calipers are designed to be pushed into the mount instead of being held back only by the friction between the caliper and the mount with radial mounting (with the friction generated by the bolt).

The pads should be fine I suppose, they are mostly all symmetrical, so there shouldn't be any weird loads, trying to eject the pads I suppose.

If it was me, I'd be checking the bolts, their tightness mostly, relatively regularly and observe if there is any cracking (this would be something further down the line, as aluminium starts cracking with enough cycles), both on the PM_IS adapter and on the caliper. But it's likely it will be fine. I'd still prefer it on the left side, like it's supposed to be though Smile

Check your hub too, 240s & co hubs from DT swiss have the mounting holes on the individual 6-bolt posts offset a bit, so there's more material behind the hole. Rotating it changes this too. Judging by the included picture, I think it's symmetrical with the hub you are getting with the fork.

BTW, where does the rod for the floating brake adapter mount to? There aren't any collars in that area.

And on a different note, will you play around with the antisquat ratios (by modifying the rod length) and the axle to crown distance (by moving the shock mounting collar)?
The rod mounts to a tab welded on the main titanium tube(I had wondered that until I got the latest pics from Vitaliy at Eternity Titanium. My first thought on getting the correct axle to crown distance was using that collar as an adjustment, although consideration needs to be taken on where the wheel ends up in the final bit of travel, and also where the back of the fork near the swingarm mount ends up near the ground. And after getting a fair baseline, I will probably start adjusting the brake rod. I will most likely need to adjust the brake rod for the travel stroke. Primoz I have another posting on this forum with the final assembled fork which I will be getting(without the spring shock).

MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 1/2/2022 8:53am
1/2/2022 8:53am Edited Date/Time 1/2/2022 9:00am
This is the mount that Vitaliy recommended the Magura. I may also buy the Hope brand(bottom right) as I have the Hope brake system, but Vitaliy wasnt sure if it would work. The hub is a TrailMech modified to accept the 25mm axle. Thank you for answering my brake question, I appreciate it.



MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 1/2/2022 9:02am
1/2/2022 9:02am
Couldn't edit in the pic of the hub, so here it is.


1
Primoz
Profile picture for user Primoz
Posts
4554
Joined
8/1/2009
Location
SI
Primoz 1/2/2022 9:31am
1/2/2022 9:31am
I'd go with the Magura adapter, speed holes (material removal for less weight) might look good, but I don't think it will benefit much here.

Too bad the tab is welded, but I suppose it's for the best, shock clearance might be an issue there too if using an adjustable collar. But you could play around with not just the level of antisquat (or prosquat), you could also play with the characteristic through the travel as well if there was an adjustable collar used.

When I was mentioning cracks, considering the welded tab will be pulled on, I'd be looking a bit more often at that tab too. That weld cracking will mean no front brake...

Has this fork been through any certification testing? Probably not?
MXBREWSK
Profile picture for user MXBREWSK
Posts
66
Joined
2/11/2020
Location
Cottonwood, CA US
MXBREWSK 1/2/2022 9:44am
1/2/2022 9:44am
Primoz wrote:
I'd go with the Magura adapter, speed holes (material removal for less weight) might look good, but I don't think it will benefit much here. Too...
I'd go with the Magura adapter, speed holes (material removal for less weight) might look good, but I don't think it will benefit much here.

Too bad the tab is welded, but I suppose it's for the best, shock clearance might be an issue there too if using an adjustable collar. But you could play around with not just the level of antisquat (or prosquat), you could also play with the characteristic through the travel as well if there was an adjustable collar used.

When I was mentioning cracks, considering the welded tab will be pulled on, I'd be looking a bit more often at that tab too. That weld cracking will mean no front brake...

Has this fork been through any certification testing? Probably not?
I am not sure about cert testing, but I am very good at checking my parts as I rode motocross for more than 40 years. I thought the same about the Magura adaptor when you mentioned strength factors. Eternity Titanium has made titanium axles for quite some time, and his messaging to me appears that he is quite up on things. I for sure will be watching that tab, as the stress may be quite a lot....or limited. I will be putting on the RS Super Deluxe Ultimate with MegNeg kit as he stated it has a fairly flat linear rate and this shock has been shown to stay up and supple through the initial and mid stroke, and then ramp up quite nicely at the end.

1
9point81 1/7/2022 1:21am
1/7/2022 1:21am
Primoz wrote:
I'd go with the Magura adapter, speed holes (material removal for less weight) might look good, but I don't think it will benefit much here. Too...
I'd go with the Magura adapter, speed holes (material removal for less weight) might look good, but I don't think it will benefit much here.

Too bad the tab is welded, but I suppose it's for the best, shock clearance might be an issue there too if using an adjustable collar. But you could play around with not just the level of antisquat (or prosquat), you could also play with the characteristic through the travel as well if there was an adjustable collar used.

When I was mentioning cracks, considering the welded tab will be pulled on, I'd be looking a bit more often at that tab too. That weld cracking will mean no front brake...

Has this fork been through any certification testing? Probably not?
He could play about with varying degrees of Anti-dive (not anti-squat) by changing the length of the brake arm tie link.
1

Post a reply to: Linkage fork