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Old Nov 8th 2012, 04:40 AM   #1
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DP 14T front sprocket

Would like to understand what is the rational behind that the 14T front sprocket from DP being not recommended for ABS equipped model,any inputs so as to why?
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Old Nov 8th 2012, 05:16 AM   #2
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Ignorance...that's the only answer I can think of....
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Old Nov 8th 2012, 06:43 AM   #3
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I may be wrong but... By dropping a tooth, you exponentially increase wear (fact) and torque being applied per tooth. With ABS I could see when activating the rear ABS the shuddering from pulsing it could potentially cause damage?
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Old Nov 8th 2012, 06:57 AM   #4
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not recommended for ABS equipped model??? where does that come from?

i have the 14t on since about 2k miles, no problems so far. acceleration not much more impressive as it has already been massive, just better gearing in road traffic...

might change back to 15t just to feel the difference again... and have to shift less ;-)
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Old Nov 8th 2012, 11:37 AM   #5
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Originally Posted by TransNone13 View Post
I may be wrong but... By dropping a tooth, you exponentially increase wear (fact) and torque being applied per tooth. With ABS I could see when activating the rear ABS the shuddering from pulsing it could potentially cause damage?
As an engineer, I can assure you that your facts aren't factual. Force is torque divided by moment arm. Torque is fixed (engine output). Moment arm is simply the distance from the center of rotation to the pitch radius of the sprocket. The relationship is linear, not exponential....unless your exponent is 1. Force (tension) in the chain should increase by approximately (15/14) - 1, or about 7%. Wear will increase comensurately.

As to why it might not be recommended with ABS bikes, I can't imagine since speed inputs are generated by wheel sensors and not an output shaft speed sensor. Hummmmm. I could see a sprocket change messing with slip ratio curves for traction control, but not ABS. Odd if true.
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Old Nov 8th 2012, 11:52 AM   #6
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As a mathematician (ahem ), exponentially typically implies something (lets say "a") rising at much fater rate then the thing affecting it (lets say "b). So my question, fewer teeth by defintion will wear faster, but exponentially? What are "a" and "b" his post? Not that any of this really matters!
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Old Nov 8th 2012, 11:55 AM   #7
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My dealership put a 14 tooth sprocket on my S w/ABS... No problems.
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Old Nov 8th 2012, 12:13 PM   #8
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I love it when you brainiacs speak nerd LOL. No offence. It's like a bad joke. A mathematician and an engineer walk into a bar.......
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Old Nov 8th 2012, 02:12 PM   #9
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Originally Posted by Cloner View Post
As an engineer, I can assure you that your facts aren't factual. Force is torque divided by moment arm. Torque is fixed (engine output). Moment arm is simply the distance from the center of rotation to the pitch radius of the sprocket. The relationship is linear, not exponential....unless your exponent is 1. Force (tension) in the chain should increase by approximately (15/14) - 1, or about 7%. Wear will increase comensurately.

As to why it might not be recommended with ABS bikes, I can't imagine since speed inputs are generated by wheel sensors and not an output shaft speed sensor. Hummmmm. I could see a sprocket change messing with slip ratio curves for traction control, but not ABS. Odd if true.
Well I R Stupid.

I really just took creative license with the meaning to overstate that it increases the wear.

Last edited by TransNone13; Nov 8th 2012 at 02:38 PM.
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Old Nov 8th 2012, 09:11 PM   #10
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Yeah, I think some people forget that the ABS speed sensor is at the wheel, not the crank... some legacy wisdom must be hanging out in dusty brains. Either that, or I've got a dusty brain.
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