The Z Torque Bike Crank-Breaking Laws Of Physics

[bob1961]

Originally Posted by gregrocks90046

Garbage. Especially with the square taper holes for the bottom bracket.

that square hole is where the center cartridge square goes so that one can pedal the bike ....

ok where point A the end that mounts to the bikes center cartridge and point B where the pedal mounts on a regular crank only has two points, what ever this is has three points now .........bob

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[vltchkr]

Reading the comments from the video I fell out of my chair after reading Terence's last quote.

The mold and setup you show is good for producing cosmetic composite components (like my buddy's "Carbon fiber" gas and brake pedal). A mission critical drive train piece, not so much.

[vltchkr]

ok where point A the end that mounts to the bikes center cartridge and point B where the pedal mounts on a regular crank only has two points, what ever this is has three points now .........bob

But we are talking Z and that is 10 points.......well in Scrabble it is.

[gregrocks90046]

Originally Posted by bob1961

that square hole is where the center cartridge square goes so that one can pedal the bike
....

Thank you, I know that. My point is that square taper cranks and bottom brackets(it's not called a 'center cartridge' by the way) are worthless, antiquated technology.

[bob1961]

i know them as a center cartidge, after all it is a center cartridge....how are the made today if not with a square center cartidge hole....

even if they came up with a circle crank and the two mounting points at 12 and 6 o'clock would do the same thing as a straight crank........bob

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[badhoopty]

reminds me of the wives tale that z-rims could be be trued by putting them in the freezer...

Originally Posted by gregrocks90046

Thank you, I know that. My point is that square taper cranks and bottom brackets(it's not called a 'center cartridge' by the way) are worthless, antiquated technology.

i'd much rather have a splined bb with pinch bolt arms.

i still remember being a kid and having square tapered shimanos (i think) on my diamond back viper. they sucked ass.

[SMR 510RR]

Yea, they are too stupid to realize that no matter what the crank looks like it does not matter.

I liked the "test" they did where the guy rode two bikes, one with normal cranks and one with the Z crank. He was obviously sandbagging the normal crank run, he was going so slow at the start he almost fell over.

I do like their facility thought, very green using a cardboard box to house your business.

[JeremyH]

Originally Posted by rnpnick

When I say moment it is interchangeable with torque.

Haha....ok.

[JeremyH]

Originally Posted by bob1961

ok where point A the end that mounts to the bikes center cartridge and point B where the pedal mounts on a regular crank only has two points, what ever this is has three points now .........bob

1+1=3? Interesting....

[vltchkr]

When I say moment it is interchangeable with torque

The true definition of Torque:

" When trying to pee with a boner and your feet slip out from under you"

[bob1961]

Originally Posted by JeremyH

1+1=3? Interesting....

3 points as with the L shape having 3 points from end to end, not 3 mounting points ....as a Z has 4 points from end to end and a W has 5 points, oh hell i know what i'm talking bout ........bob

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[gregrocks90046]

Originally Posted by bob1961

i know them as a center cartidge, after all it is a center cartridge....how are the made today if not with a square center cartidge hole.

You can still buy square taper cranks and BB. It's such a bad design, and it's why I used a one piece crank for BMX racing. Those square taper cranks would always come loose. When Redline came out with the Flight Crank, it used a splined bottom bracket spindle. Those cranks were stronger than most one piece cranks. So now any modern, high performance crank set up uses some type of splined spindle. If you want, just google Profile cranks, Shimano Saint cranks, or Isis bottom bracket and you'll see what I mean.

[JeremyH]

Originally Posted by bob1961

3 points as with the L shape having 3 points from end to end, not 3 mounting points ....as a Z has 4 points from end to end and a W has 5 points, oh hell i know what i'm talking bout ........bob

....

Oh, I knew what you were talking about, I just dont see how it is relevant to the rest of your statement. At first, you talk about mounting points....then you talk about how many corners a letter has...

[Rockpiledriver]

Greg, hows that saying go about having a battle of wits?

[SMR 510RR]

L,W,Y,Z,N,M doesnt matter, only the point where you apply the pressure and the point where it is attached on the other end matter when looking at how the force is applied. Of course having corners may reduce rigidity and you may actually lose power.

I am curious about the Universities that agreed that it was an advantage, maybe a clown college or two?

The only way to make this do what it is supposed to would be to have additional linkage. The top portion would have to pivot on the lower portion but be constrained deepening on the location of the crank in its stroke. Even then I believe the effect would be negligible because it would be similar if not the same to having a faster gear ratio.

[djjiz]

Pretty sure bob bought stock in this company......dj

[C*H*U*D]

Originally Posted by gregrocks90046

You can still buy square taper cranks and BB. It's such a bad design, and it's why I used a one piece crank for BMX racing. Those square taper cranks would always come loose.

The square taper wasn't the problem. It was back when they were nutted instead of bolted that caused the problem. I had the nutted version and yes they always came loose. Once the bolted bottom brackets came out, that ended...raced on them for years and they never came loose. The only way to get your crank arm off was to use a crank arm puller.

Although I agree...the new design is much better.

[gregrocks90046]

Originally Posted by C*H*U*D

The square taper wasn't the problem. It was back when they were nutted instead of bolted that caused the problem. I had the nutted version and yes they always came loose. Once the bolted bottom brackets came out, that ended...raced on them for years and they never came loose. The only way to get your crank arm off was to use a crank arm puller.

Although I agree...the new design is much better.

True, but after Flights and Profiles came out, I never bothered trying a bolted square taper.

[BigSki]

Until Shimano or Race Face puts their name on something like that, I'd bet that it's just an exercise in design, not an improvement in efficiency.

[Duuuuuuuude]

Originally Posted by SMR 510RR

I am curious about the Universities that agreed that it was an advantage, maybe a clown college or two?

I am more curious about what university would actually take the time to double check the engineering on something. Can I just drive over to my local college and drop something off to the engineering class to inspect?


Also, I'm a little baffled how they managed to cast an aluminum part in a plaster mold...


edit: never mind...that's the mold they're using to make their highly dangerous carbon versions...