DP 14T front sprocket

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Titaniumvalves

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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?:confused:
 
Ignorance...that's the only answer I can think of....
 
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?
 
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 ;-)
 
TransNone13 said:
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?
Click to expand...

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.
 
As a mathematician (ahem :rolleyes: ), 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!:D
 
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....... :D
 
Cloner said:
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.
Click to expand...

Well I R Stupid.

I really just took creative license with the meaning to overstate that it increases the wear.
 
Last edited:
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.
 
Titaniumvalves said:
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?:confused:
Click to expand...

Where did you see a reference to a 14T front sprocket not being recommended for an ABS 1199??
 
Been through this with other models. This is what Ducati will tell you..


The ABS system uses both speed and RPM in its computations, two things directly affected by changes made to the gearing ratio. The ECU that governs the ABS system is programmed to work with the stock gearing on the bike only

I've changed it with other models and not seen any impact on ABS.
 
geeteethree said:
Been through this with other models. This is what Ducati will tell you..


The ABS system uses both speed and RPM in its computations, two things directly affected by changes made to the gearing ratio. The ECU that governs the ABS system is programmed to work with the stock gearing on the bike only

I've changed it with other models and not seen any impact on ABS.
Click to expand...

Not sure what source you're referring to but the Ducati Master Technician here says differently... Tire size can / will affect the performance of traction control and very minor affect with ABS. But gearing nor engine RPM have nothing to do with ABS...
 
tholstro said:
Not sure what source you're referring to but the Ducati Master Technician here says differently... Tire size can / will affect the performance of traction control and very minor affect with ABS. But gearing nor engine RPM have nothing to do with ABS...
Click to expand...

Source is Ducati, in an email received when I questioned regarding one of my other bikes. I had cut and pasted this into another forum a while back. There were many quoting Master Technicians then too so I went to Ducati.

My opinion is that it makes zero difference but from a legal standpoint Ducati don't want someone suing them because they noseplant a bus.
 

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