Wtf....

[stevie t]

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And it's for sale....... (For sale $2500
2002 ZX900R 25k miles on motor in a unique frame. All parts are there and motor was just tuned, ran strong when project started. Finish the Monotracer (www.youtube.com/watch?v=v9-hMlN19NE) style bike or use the motor in your own toy. New Pirellis, Current non op registration and salvage title.
Call 619-964 three seven27)

How do you think you deploy the side stand out when you park it?

 

[Shaman]

wut

 

[Jampy00]

The video kind of sums up what the seller was intending to do with this project. As for the side stand, I think that may only be temorary until the project was completed.

 

[BNKN]

That looks very promising. You'd have to wonder why he's selling now. Death in the family? Financial ruin? This is perplexing.

 

[rmemedic]

not sure why he wouldn't go with an aluminum structure... That thing has to be fairly hefty using steel like that.

 

[espro]

not sure why he wouldn't go with an aluminum structure... That thing has to be fairly hefty using steel like that.

Probably doesn't know how to weld aluminum?

 

[BNKN]

Probably doesn't know how to weld aluminum?

That's it for sure. Judging by the design, ease of fabrication was a probably huge contributing factor to material choice. You see that a lot on Indian reservations.

 

[unoR]

lolwut, Interesting build.

 

[suzuki2000]

How do you think you deploy the side stand out when you park it?

this is the under pinnings of one of these:

when you stop/park the side wheels come out

 

[RockerGuy]

Probably doesn't know how to weld aluminum?

Steel doesn't flex as much, provides better feedback. Trellis frames provide a rigid chassis

 

[BNKN]

Steel doesn't flex as much, provides better feedback. Trellis frames provide a rigid chassis

Aluminum mountainbike frames are known for rigidity whereas steel frames are known to "give" more.

 

[D23]

[video=youtube;VbdkZB9-Sd4]http://www.youtube.com/watch?v=VbdkZB9-Sd4[/video]

 

[RockerGuy]

Aluminum mountainbike frames are known for rigidity whereas steel frames are known to "give" more.

Really??

Sent from my Phone, dont judge the grammar

 

[BNKN]

Really??

Sent from my Phone, dont judge the grammar

Ever see an aluminum spring?

 

[RockerGuy]

Ever see an aluminum spring?

Stiffness is quantified by a parameter called Modulus of Elasticity. Without getting overly technical, we can look at the relative stiffness of steel versus aluminum by comparing this parameter:

Aluminum’s modulus is about 10 million psi.
Steel’s modulus is about 3 times that: 30 million psi.
That means, for a common structural shape used in jib design, (for example, a 2-inch square tube), and for the same limit of bending with the same load, the wall thickness of an aluminum tube would need to be more than 3 times the wall thickness of a steel tube.

http://www.cineventions.com/steel_aluminum.html

But aluminum is softer and less strong in tension and compression. So why are steel bikes perceived to ride softer over aluminum? Steel bikes are generally more limber feeling due to tube sizes used compared to aluminum. Because aluminum is softer and less strong larger tubes are used to add stiffness, otherwise the alloy frame would flex more than steel. Greater flex means more deflection; excessive deflection will kill any frame no matter the material. Cracks will result followed by catastrophic failure. Larger tubes get stiff no matter the material, an ideal trait for making bike frames. Controlling tube size controls stiffness, so dialing in the ride within acceptable deflections should be the goal.

Can a steel bike be made as light as aluminum? Steel frames have come close in matching weights of aluminum. Ultra thin wall steel tubes with single and double butting can shave many grams. The weight savings is admirable and the production ease of steel retained. Typical wall thickness of our frames of steel is .032 down to .028. Ultra thin tubes are .012 to .016.

http://www.rans.com/ITR41.htm

 

[BNKN]

That's your win RockerGuy but I'll be watching you...............

I should've thought that thru a little more before opening my big yap. I was thinking in terms of aluminum being more brittle. I've got 2in x 1/4in flatbar in aluminum and mild steel in the shop and I wouldn't dream of trying to bend the aluminum into a bracket. I've heard the mountain bike thing for years. Aren't the Cannondales nicknamed Crackindales? Anyway, good on youccasion7: and I learned something else today.

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