[Closed] Whats this hole for?!?

floating brake arm

aka Kona DOPE system

http://www.pinkbike.com/photo/7046262/

clutch plate cover

The optional sidecar.

[Edit: damn, too slow. What's that brake arm thing supposed to do then?]

Oh yeah!

[img] [/img]

blimey, there's a lot going on on the back of that bike eh.

Anti-overside wang-flapping protector stud.

What's that brake arm thing supposed to do then?

ploy to knock 100 grams off last years model ?

Make the brake work almost as well as if it's on a bike with a proper 4 bar back end.

Heh, I see, thanks! 🙂

It's for the flux capacitor

Whoah, that CoilAir posted by dezb is a bit of a dawg!

OP - lets see some more pics of your bike then.

mrjmt - Member

Built up my new Kona Dawg at the weekend and noticed a strange threaded hole...

Where did you get the frame from?

I really enjoyed the play about I had one a few years ago.

Make the brake work almost as well as if it's on a bike with a proper 4 bar back end.

Think you will find it is a proper four bar back end.

OP - lets see some more pics of your bike then.

Thats not my bike, i've got one pic on my phone, i'll find somewhere to host it and post it up.

Where did you get the frame from?

I really enjoyed the play about I had one a few years ago.

From CRC in their half price kona frames thing theyve got at the moment.

Hope this works...

[IMG] [/IMG]

I know the green hoses don't go, just waiting for a little more cash flow to change them!

It's for the flux capacitor

Or more accurately the faux compensator

Think you will find it is a proper four bar back end.

Ahh I think this is a common misconception, let me help you to sort it out.

Whilst I can't see properly on the white bike, the green bike above is defo a single pivot. There is on straight unpivoted [b]bar[/b] between the frame and the back wheel, therefore the back wheel will follow a circular arc whose radius is fixed at the length of that [b]bar[/b]. All them other pivots will just change how the shock is compressed.

Think you will find it is a proper [s]four[/s] faux bar back end.

Think you will find it is a proper four bar back end.

edit sorry slow typist here

Excellent, all the arguing about the linkage means nobody has noticed the amount of bird poop on my drive! 😆

nobody has noticed the amount of bird poop on my drive

it's not tho is it?

Err no it is. Its the most simple version of the four bar design.

http://mtobikes.com/four-bar-linkage/

The most basic four bar linkage design is the ‘Faux Bar’

Oh look, you're wrong.

Luckily the people on here with brains don't need to visit a website to know that its actually wrong. That makes you and the author of that site wrong. Although in his defence he states that "This linkage still has the axle mounted on a chainstay which is directly mounted to the mainframe via a pivot, exactly the same as a single pivot design, and so will have the same axle path characteristics"

Which in anyone else's language makes it a single pivot. Although we will forgive you as some people like to call a faux bar a four bar, even though its not. The clue is in the title (its the faux bit in case you missed that)..

Anyway your link reminds me of this:

“The trouble with quotes on the internet is that it’s difficult to discern whether or not they are genuine.”
? Abraham Lincoln 1843

faux - french for false.

i.e. its a false.

its a four bar fsr wanna be ( a single pivot linkage driven bike)

Own a Kona by any chance, flow? Getting all defensive?

"people like to call a faux bar a four bar, even though its not"

Unhelpfully I think this also includes Kona, or at least their marketing/advertising department

[i]Think you will find it is a proper four bar back end. [/i]

Its not. Its effectively a single pivot with a linkage driven shock.

However its so close to a 4-bar that nobody really notices the difference.

Nice bike. Enjoy it.

Such a promising thread title with such disappointing content 😉

James - where? I can't find reference to either?

Think you will find it is a proper four bar back end.

Its not. Its effectively a single pivot with a linkage driven shock.

However its so close to a 4-bar that nobody really notices the difference.

Nice bike. Enjoy it.

Cheers mate.

This thread is turning rather [s]amusing[/s] tedious. 🙄

Such a promising thread title with such disappointing content

The way its going I might just start a new one with a picture of a belly button. 😆

It's all about the Horst Link innit.
Faux bar don't have it whereas Four Bar do.

[img] [/img]

That'll confuse people who don't read the whole thread 🙂

I'm sure that looks unusually deep.....

flow - Member

Think you will find it is a proper four bar back end.

Presumably the designers think that too, otherwise they'd have fittings on it for a floating...

Oh

toys - I'm with you on this one, but they way I have explained it to the nay-sayers in the past is:

> the faux-bar system is a 4 bar *linkage*

> the fuax-bar system is NOT a 4 bar *suspension system*.

ie:
It is a 4-bar linkage, there are physically 4 bars in this arrangement.

However the important element is where in the linkage the wheel is attached.

On a faux-bar system the wheel is only 'suspended' by one of them, making it a single pivot suspension system, with linkage actuated shock.

Using this explanation normally results in "ahhhhh, i see!"

It's all about the Horst Link innit.
Faux bar don't have it whereas Four Bar do.

ah, but no, you don't have to have a 'horst' pivot for it to be a 4-bar.

The horst bit only refers to a very specific placement of the pivot. VPP/Maestro/DW/Lawwill are 4-bar suspension systems too, just arranged in a different way, and consequently give entirely different suspension characteristics.

amedias fair enough, except in the green bike above (the op's image) there are only 3 bars? (unless you include the floating linkage)

thats not my image.

there are only 3 bars

frame = a bar
rocker = a bar
chainstay = a bar
seatstay = a bar

= 4, same as a FSR style horst 4-bar.

if you think about it, on a Kona, all you'd have to do to make it a 4-bar is move the pivot from seatstay, to chainstay, but this doesn't create any more 'bars'.

who cares what the suspension system is called
its all marketing BS anyway

the important thing is that they are awesome bikes, if i could justify it id replace my one with the crc deal but its just lovely as it is
[img] [/img]
now has slx cranks and a gravcity dropper, just came back from a weekend at afan and brechfa where it was da bomb!

That doesnt count otherwise a true four bar would be called a five bar.
Look at this [url= http://en.wikipedia.org/wiki/Bicycle_suspension#Single_pivot ]wikipedia link[/url]

The actual four bar has 4 parts not including the frame - its the only way to get a non radial wheel path.

if you think about it, on a Kona, all you'd have to do to make it a 4-bar is move the pivot from seatstay, to chainstay, but this doesn't create any more 'bars'.

Unfortunately this doesn't work because then the wheel would follow the radial path of the seatstay instead.

(edit apologies to the non pedants - flow started it and has a habit of being rude, others are more interested technically - like me and amedias here so we surely can be allowed to discuss it? )

if you think about it, on a Kona, all you'd have to do to make it a 4-bar is move the pivot from seatstay, to chainstay, but this doesn't create any more 'bars'.
Unfortunately this doesn't work because then the wheel would follow the radial path of the seatstay instead.

nope - it does work.

On the Kona, move the pivot that is currently above the rear axle, on the seatay, to the horst position on the chainstay.

Then you have the same configuration as a FSR. No extra 'bars' created

Visualise the setup without the rear wheel/axle, and you will see they are essentially the same mechanical system, the difference is where you attach the wheel.

Visualise the setup without the rear wheel/axle, and you will see they are essentially the same mechanical system, the difference is where you attach the wheel.

leading to a different axle path

so we surely can be allowed to discuss it?

Discuss WTF you'd like, this is the internet, knock yourself out! 😆

Back to the original topic however, some people dont even have a hole, they have a small protrusion. They're called 'outies'. 😉