980g suspension fork anyone?

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  • 980g suspension fork anyone?
  • andyhbikes
    Member

    Think I will stick with sids

    theflatboy
    Member

    Doesn’t he need his?

    plyphon
    Member

    the suspension aspect of it looks crap but the engineering side is fantastic

    Looks cool, weren’t RST doing something similar with elastomers and a pivot arround the steerer/fork junction?

    DT78
    Member

    Surely that isn’t strong enough to take big hits?!

    theflatboy
    Member

    DT78 – Member

    Surely that isn’t strong enough to take big hits?!

    Re-read the details – it’s for a 29er, no big hits will be encountered hence no problem.

    rob2
    Member

    I shit you not, but I was sponsored by sainsbury engineering trust at uni and my tutor and I designed almost exactly the same fork as the first year project with a wound carbon spring (not leaf) and the linkage was at the fork crown not the axle ! Spooky dook

    Premier Icon Harry_the_Spider
    Subscriber

    I wonder what the fast lads on the 29″ rigid race bikes will make of that?

    Premier Icon 40mpg
    Subscriber

    I’ll take the on-one budget version for a bit of comfort on my rigid singlespeed.

    maxtorque
    Member

    Now it’s very possible i’m getting this wrong, but isn’t approx 1kg for 60mm of (underdamped/non adjustable) travel really not that impressive? How much mass does the lightest short travel conventional airsprung fork have??

    LoCo
    Member

    Interesting, what’s the life span on those?

    Junkyard
    Member

    5 year guarantee offered and 130000 cycles on the test bed from the link

    PS how would you service that bad boy …cynicAl would have you out of business in weeks with his spoon bodgery 😉

    Toasty
    Member

    but isn’t approx 1kg for 60mm of (underdamped/non adjustable) travel really not that impressive? How much mass does the lightest short travel conventional airsprung fork have??

    ~1500g for some top end 29er Sids. I bet the most common rigid forks on here is the On-One style jobbies, which weight almost exactly the same as the above.

    A lot of race frames are still built around 80-90mm forks anyway. 20-30mm travel lost, for 1lb weight saving. Looks to be mud proof and have a ton of clearance at the top as well.

    Premier Icon chipps
    Subscriber

    Lauf Trail Racer Fork. The lightest 29er suspension fork ever?

    It’s like being back in the mid-90s! 🙂
    I’m loving the bonkersness.

    How does it resist the twisting from the disc? Even my old Maverick SC32’s used to veer to one side slightly.

    Premier Icon Dougal
    Subscriber

    A lot of race frames are still built around 80-90mm forks anyway

    Total rubbish. In reality very few are, the size 15in Specialized have 90mm forks, but almost every other bike is 100mm.

    The guy riding it in the pictures looks like he could lose about 20lbs before worrying about losing the weight from his forks.

    IanMunro
    Member

    How does it resist the twisting from the disc? Even my old Maverick SC32’s used to veer to one side slightly.

    Indeed.
    I think fork mounted camera footage of it’s lateral tracking through ruts would also be interesting.

    Candodavid
    Member

    I thought they were having a ” Lauf”
    I’ll get my coat 😆

    tazzymtb
    Member

    it doesn’t matter if the travel is only 60mm or so as long as the axle to crown is adjusted accordingly in the design so it won’t steepen the head angle on frame for 100mm. My issue is the 45mm offset..would feel old skool 29er pretty barge like on a lot of 29er frames that have moved on and designed for longer offsets.

    Toasty
    Member

    Total rubbish. In reality very few are, the size 15in Specialized have 90mm forks, but almost every other bike is 100mm.

    Slightly dramatic reply there to 10 mm 🙂 My point still stands.

    I’m using a 23″ 2012 Stumpy HT at the moment which uses 90mm*. Prior to this I used a Scandal which was corrected for 80mm. Cannondale still use 80-90mm on all 29er hardtails? I think Specialized + Cannondale alone would constitute “a lot” on the subject of racey bikes? 🙂

    *http://www.specialized.com/us/en/bikes/mountain/sjht/stumpjumperelitecarbon29#specs – this years models, 80mm for smallest, 90mm for the rest.

    calumf50
    Member

    but the engineering side is fantastic

    Any engineer worth his/her salt would notice a major flaw with this design straight away… 🙄

    toys19
    Member

    hmmm, so if I understand this correctly its a carbon spring, relying on some “inherent” damping in the carbon? ( more likely any damping comes from the resin system the carbon springs are laid up with, if there is any resin?)
    I wonder if you took a decent light weight 80mm travel trail fork, took all the damping kit and oil out of it, and replace the steel/titanium spring with a carbon equivalent spring if you would not be far off the same weight?

    Goes to check calendar to make sure it’s not April 1st.

    It’s going to self steer something crazy, there’s only the axle trying to keep the left and right sides in sync…

    taxi25
    Member

    Its a load of tosh, forget about it.

    ..speaking of proper mad stuff from the 90’s I thought it reminded me of something:

    shermer75
    Member

    That Smokestone looks a bit crazy. Reminds me of those home modified bikes that came up on eBay about six months ago…

    tazzymtb
    Member

    I’d rather have a few grams extra for 30mm more travel and damping and a stiffer fork

    bikebouy
    Member

    Just read CFH’s thread and its lead me here to comment..

    I like the engineering angle, well thought out, prefer the knitted jumpers though.

    Wouldn’t have it on my Niner, sorry.

    andyl
    Member

    Lots of assumptions in here tonight.

    Who knows if this is less stiff than a conventional fork as there is no data.

    Damping – why would there be no damping? Play tennis with an aluminium racquet and then with a carbonfibre one and tell me they feel the same.

    60mm of travel is still better than a rigid fork.

    Brake twist – maybe they are designed to resist the braking loads? Again no data to say either way.

    I like it. Now build a frame with similar technology for the rear and give me a 60mm travel 1.2 kg full suspension frame.

    tazzymtb
    Member

    I like it. Now build a frame with similar technology for the rear and give me a 60mm travel 1.2 kg full suspension frame.

    undamped frame with no rebound control? pedal-bob-a-rific surely?

    cynic-al
    Member

    If braking forces cause flexible. It’s more likely to make the wheel cant sideways to the right – its well reinforced fore/aft.

    I like it. Innovation is good. Could something bonded in between the leaves a la Softride, for damping?

    You have to wonder about a single sided version?

    andyl
    Member

    undamped frame with no rebound control? pedal-bob-a-rific surely?

    10/10 for missing my earlier comment on damping.

    Al – yup, completely feasible that something could be placed between the springs to change the damping but you could also just swap out the springs with ones with a different properties such as different amounts of viscoelastic materials.

    Might see it on Paris-Roubaix

    Seem to have submitted a patent… no pics though
    https://www.google.com/patents/WO2013046236A1

    Marmoset
    Member

    Cool idea, for added awesomeness I think it needs some holes drilled in it somewhere and some purple anodising incorporated into the colour scheme…

    It’s a very clever simple idea. I think the tracking issue is probably lessened by the through axle?

    toys19
    Member

    10/10 for missing my earlier comment on damping.

    Al – yup, completely feasible that something could be placed between the springs to change the damping but you could also just swap out the springs with ones with a different properties such as different amounts of viscoelastic materials.

    0/10 for assuming that just becasue you typed it, it must be true. I’m sure he read it, just decided it was incorrect. How much damping is there in that carbon? Eff all compared to an actual damper unit. You can see from the video it bobs on small bumps. The tennis racket analogy is incorrect, the carbon racket feels more flexible because it is more flexible. Nothing to do with damping.

    Premier Icon Harry_the_Spider
    Subscriber

    A lot of assumption and speculation going on here based on a couple of photos and a video clip.

    Perhaps, assuming that this is a commercial venture and not just a design exercise, one will be made available for test. The only way to tell if it works would be to let somebody actually ride it.

    Premier Icon richmars
    Subscriber

    The ‘spring’ bit isn’t new, it’s just a flexure. Used all over the place (eg F1 suspension) to give friction free movement. Look in any compliant mechanism text book.

    How does one adjust spring rate?

    Premier Icon nixie
    Subscriber

    You don’t, three different stiffness’s available.

    Premier Icon richmars
    Subscriber

    How does one adjust spring rate?

    Thickness (or construction) of the flexure.

    5thElefant
    Member

    The ‘spring’ bit isn’t new, it’s just a flexure. Used all over the place (eg F1 suspension) to give friction free movement. Look in any compliant mechanism text book.

    Or any old horse cart in a museum.

    Premier Icon molgrips
    Subscriber

    Hold on – the two sides aren’t linked, are they? What’s to stop it deflecting left to right besides the axle being clamped in?

    I’d have to ride it, to be honest.

    Premier Icon ir_bandito
    Subscriber

    What’s to stop it deflecting left to right besides the axle being clamped in?

    The axle being clamped in it.
    Its not a massive problem on upside-down forks, like Mavericks, where the two lowers are only joined by the axle. And i guess the flexures are designed to flex vertically and be stiff sideways.

    Bonkers. Probably even quite good in a few situations. Ugly. But I love the fact they’ve got the balls to try something different, regardless of what the armchair (and real) engineers on the forums say.

Viewing 45 posts - 1 through 45 (of 65 total)

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