Global-flat.com Board
English => Parts & Bikes => Topic started by: saras20 LT on November 18, 2007, 06:33:28 PM
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HI i've got the ecoflat pro crankset ind im wondering which sprocket to get the 20T or the 18T.i like the 18T becouse the gearing would be lighter with my 9t driver.is 20T stronger than 18T ?not sure if the 18T could brake easily.....becouse some of my friends had 20T ninja and they've broke em all
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The 20t will be stronger than the 18t but you should be more concerned about how it will feel... 18/9 is really light but if you like it than ok!
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I think i will stick to the 20T/9T couse its stronger :ph34r:
anybody know when the ecoflat/hollowflat sprockets will be in sale in FF?
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i currently have a 28t sprocket with a 12t driver.
how would 20/12 work? :huh:
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i currently have a 28t sprocket with a 12t driver.
how would 20/12 work? :huh:
Not good, i ride 24/12 and thats still a litte slow.
I think 26/12 will be perfect.
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i ride 27/12 and its perfect for me
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yeah, i like my 28/12.
but im looking into the ecoflat crank set. doesnt it come with a 24t sprocket?
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yeah, i like my 28/12.
but im looking into the ecoflat crank set. doesnt it come with a 24t sprocket?
Yes it does, thats why i'm riding a 24t sprocket... its the standerd sprocket that comes with the Ecoflat pro.
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ohh, okay. well now im a little confused about the BB. i have a dk signal frame, which has an american bb, and the crankset is euro.. :huh:
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The current ecoflat crankset is euro bb. It will not fit U.S. bb. The 2008 ecoflats come in all bb configerations. 20/12 will not feel right. If you want 20 up front, the ecoflats have that size but you really need a 9 tooth freecoaster.
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but i read somewhere in this forum that the less teeth the weaker,becouse those less teeth dont handle the preasure than the sprocket with more teeth.just what I've read. :huh:
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in fact i like to tighten my chain to ^_^ so its very tight ^_^
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Ha ha!
Guys, guys, guys.
I'm really disappointed!
The smaller the stronger.
No, a 20T sprocket isn't stronger than an 18T sprocket!
I disagree with you Yeti,
If we are talking about the same sprocket in 2 sizes (same design and material)
I think that the bigger (more material) the stronger it will be.
In this case we are talking about only 2 teeth, that doesnt make a big diference.
The design looks strong and the weight diference is only 6gr.
NEW 18T = 0,84 o.z. - 24 grammes
20T = 1,05 o.z. - 30 grammes
5 mm thick
7075-T6 alloy
(http://www.stmartinbmx.com/img/2008-sprocket.jpg)
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You can't run small gear technology with U.S. BB!!
20T, 18T, 16T, 14T works only with Euro BB or Spanish BB.
I guess 16T or 14T/8T works only with Euro.
Also you need a frame that's made for small gears.
thats funny, because i have my dividual witch is a american b.b. and it has a 20t st martin sproket on it.
i dont think though i could go any lower.
so under 20t would not work for a american b.b.!!
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but now i m curious of the mid?
is that not the same size as the american b.b.?- just press fit?
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It's not about "thinking", it's about "knowing"!
How do you know that?
Have you tested the same sprocket in 2 sizes to say that the smaller one is stronger?
Alot of people broke KHE ninja 20T and 25T sprockets but I never heard of anyone that broke a bigger size ninja.
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It's all about the thinkness and the material... if a 20t sprocket is as thick as a 18t one then I think the 18t is stonger because the diameter is less.
And the ninjasprockets are not really comparable because every size has a different design.
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Ha ha!
Guys, guys, guys.
I'm really disappointed!
The smaller the stronger.
No, a 20T sprocket isn't stronger than an 18T sprocket!
The 20T Ninja sprocket broke because KHE used weak material.
KHE replaced the 20T Ninja with a new, stronger version.
You can't run small gear technology with U.S. BB!!
20T, 18T, 16T, 14T works only with Euro BB or Spanish BB.
I guess 16T or 14T/8T works only with Euro.
Also you need a frame that's made for small gears.
Actually 18t and 20t teeth are both as strong, yes, the body is less likely to bend etc. But with 18t sprocket all teeth would get a little bit more stress from chain making it more likely to brake a teeth.
I think 20t woul outlast the same 18t sprocket, atleast in flatland where you dont do sprocket grinds/stalls etc.
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A larger object of any description is usually weaker then the smaller one as long as they are identicle in construction. It goes by force or leverage known as the fulcrum, where the larger the object, the more likely to snap, break or twist. If ppl can remember, some riders would break 175mm and 180 mm cranks and switched over to 160 mm cranks in the eighties, its the same principle. Less diameter = less force.
The first ninja sprocket was a terrible example to go by. The 20 tooth broke all the time, not by size, but by its construction. It was upgraded to a thicker , stronger design. Also, the smaller the sprocket, the faster the teeth will wear, this is because less teeth are in contact with the chain at any one time and also because each teeth gets alot more use because there is less of them, but this does not affect its overall strength, just wears out faster.
A 44 tooth alloy sprocket will outlast a 16 tooth alloy sprocket as far as teeth are concerned because of this, however, in the event of an impact, the 44 will snap far quicker.
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Get the 18 tooth. 18/9 ratio works very well. also they make a 16 tooth which is awsome and out of the way, but alot of people dont like the gearing. My friends have never had a problem with breaking the 18 tooth st martin.
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Smaller gearing causes more wear and tear on the teeth of the sprocket and on the chain...2 teeth wouldn't make much difference..Its more wear and tear compared to a bigger sprocket like say a 36t...The bigger the sprocket,the more teeth and links in the chain to spread the stress out on..And we got these new 7075 sprockets everywhere there alot stronger and harder than 6061 sprockets..
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for those who have cars, are weight whores, or can do blenders:
(http://img.photobucket.com/albums/v174/iflatland/sprocket-2.jpg?t=1195703538)
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15t is just plain wrong.
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A small sprocket won't wear out faster than a large one if you ride at a certain, slower speed with it.
It REALLY depends on the # times the sprocket goes around, the RPM of the cranks.
A bicyclist (riding for transportation) using a small sprocket might pedal faster to compensate, or he may ride at a crank RPM that he's comfortable with, no matter how fast the sprocket size makes him go at his gear ratio. It depends on the rider. And plus, us BMXers more or less don't ride for transportation.
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OMG that 15 tooth is small. You will pedal like crazy with that thing.
Until 8 tooth freecoasters come out, I think 9/18 is the smallest ratio thats still functional for now. In the future, 8/16 may be the norm for flat.
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hi!
You can put euro/spanish/mid or US BB on the new ecoflat (called holloflat).There's just one bolt for the 2arms...look at ST martin 's website.
16T is also available,it's about 16grammes (0.564 oz for you)