Ya man... really don't paham this thing about big travel suspension in general.

Fitting a big fork doesn't make a XC bike a MTN bike. Geometry is so different.

Freeride steel hardtails are another story though... somehow NS bikes, Cotic's and british steel in general is strangely sexy.

how to kill a bike frame. hahaha.

wow.
kona stinky. until crack.
so sad.

may i know what is the material of the film that you bought?
i am looking for polyurethane material flim......

Your road bike sample is more accurate than your Konek Stinky...
Based on the argument here, stress angle on fork will cause the head to crack = possible.

Stress angle on fork causes middle of the frame to crack = not possible.


No matter how, look at the commercial and manufacturing side of the story.
A 140mm fork will cause a 100mm frame to crack? My personal opinion = No.
If the frame design is so lousily done... you shouldn't use it even for 100mm.
Anyhow, it is only a very personal opinion.
Millions of people in this world are playing around with the fork travel. Do a google search how many complain about fork travel = crack head....
We should get a clear answer.

usually the force will impact on the headtube before going to rear triangle.....

timmy...
i always like ur answer...
makes everybody think...at least it got me thinking...
u somehow might be correct...

so who's up to try double crown on XC frame?

then from on top of steroid...we terjun the cliff sam hill style!

but srsly...i think it will crack...no doubt...but the amount of abuse needed might be WAAAAYYYYYYYYYYYYYYYYYYYYY over what any of us can provide...

btw...
Hope Pro II hubs + DT Swiss 4.2 rims + DT spokes = 1.7k.
Cheap?

xc frames are meant to be light. has less gussets and reinforcement welds between head tube and top&down tubes. frames designed for longer travel (not xc frames) have more gussets and welds around the head tube area.

if u look hard enough on the internet, there have been alot of cases of cracked head tubes due to ppl playing around with the fork travel. i know of a few ppl who have had hairline fractures happen to their frames too.

and almost all frame manufacturers state the max travel fork their frame is designed for, if a longer travel fork is used then the frame warranty would be void.

not every1 can afford to replace their frames easily, so my advice to mousepad87 is to not change it. ultimately, the decision is up to him, and whatever consequences are his.

anyways, if the torque is acting in a forward (outward direction), and the down tube is flexy enough to allow head tube movement without cracking itself(which is generally possible, since the down tube is usually butted, thus more flexy), the the bottom of the top tube will undergo tensile (pulling apart) stress, leading to the crack on the stinky. that means the head tube in itself is strong enough, but the stress concentration at other parts in the surrounding area lead to failure.

i wouldnt want to mislead some1 and tell them to go for whatever travel they want, and then something happens to the frame. that would just be irresponsible.

I am really not good at all these engineering term.
Film? He! He! He!


For xandman...
If you put DH fork on your XC bike, ur bike will still move and still be able to bring you from point A to B.

But if you say jump from top of the hill, whether fork A or fork B, ur XC frame will still give way.




And this is for xandman...
Some like black... some like red... how about white? This is being sold in Malaysia...



This post has been edited by timothyy: Dec 3 2009, 09:23 PM

pro2 - RM980
dt 4.2 - ?
dt spoke (wat model) - ?

Again, in theory, a lot of things cannot do one.

I sell diesel engines. If really wanna follow the manufacturing guidelines, one of my engine need to top engine oil of 1litre every hour. Ha! Ha! Ha! Of course, this is their so called guide.

But in term of safety and manufacturing standards in this world... American companies tend to be more traditional and leave a lot of room to play whereas European companies tend to use to the max of their product.

And if someone really listen to any of our guide here without doing their own research... well, too bad for him/her. After all, LYN is supposed to be an IT based forum and I am only 12 yrs old.
He! He! He!

cottec frame is nice.

i bet you dont sell alot of that model of diesel engine right? hehe. diesel engine for industry is it? interesting.

in the design process, usually safety factor is used, or fatigue life.

higher safety factor=more material=more strength. but then that just defeats the purpose of a lightweight xc frame. if u want high safety factor with low weight, use a titanium frame.

and if by buying the fork and cracking the frame is what u meant by the words "doing own research" is , imho its quite an expensive research. and potentially dangerous.

and again, the decision is up to him. i think i've said enough about this particular issue, and any further argument would be pointless.

Ha! Ha! Ha! Not really. One of the biggest selling model in Malaysia.
But heck... it is not true though...

He! He! He! OK la... ok la. Don't disturb with your engineering study.

We all no sikul one. He! he! He!

hahahaha...
timmy kaco that fella kaw kaw...
auyaaaa timmy...rilek la...
we baru mau masuk Form 1 maaaa....where know all these one...

and timmy...
u intro'ed me to KONEK...now COTTEC plak?
hahahaha...
why bikes have weird names which resembles a certain gander's private parts?
hahahahaa...

nah. not engineering study. just sharing knowledge. basic physics actually. i dun understand 90% of what my lecturers teach me

i just dont see the point in arguing with logic and manufacturer's spec. and the "tidak apa" attitude among malaysians sorta saddens me.

at least I know why I cant get AM fork for now.

b4 dis I only consider of energy loss when climbing using long travel.
now I know possibilities that can happen to my frame.

so conclusion is I get my answer, which is no to AM fork ...but very cheap lio..

He! He! He!

Anyway... away from sensitive issues...

Here is a fork for unker xand...


and this is the spec...

Travel: 100mm
Weight: 1395 Grams
Steertube: Alu Anodized
Crown: Alu forged cnc machined painted
Stanchion tube: 28.6mm Aluminium black anodized
Outerleg Unit: Hollow Carbon Arch, Carbon Tubes, Mag Dropouts
Spring System: Linear Air-Spring with Coil Negative Spring
Damping System: Integrated Twin-Tube Damping system with Remote Lockout
Adjustments: Air-Pressure, Rebound, Lockout with internal adjustment & Blow-off
Disc-Mount: Post Mount , Max 185 mm

unker xand wanna buy FR bike edi, y wanna go for xc fork?

although that fork is damn nice. seen on alot of UCI world cup XC bikes.