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Old February 15th, 2014, 06:43 AM   #1
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Exclamation Speedometer is off big time after changing front sprocket to 14T

Just had the 14T front sprocket installed today and noticed that the speedometer is VERY off. Up to 50mph, according to my GPS, it's only about 2mph off, which is normal. But while cruising at 65mph, my GPS said I was doing 60mph... that's 5mph off and pretty huge! I haven't gone passed 65mph since installing the sprocket but if it goes from being 2mph to 5mph off with just a 15mph increase, I can only imagine what it's going to be like at faster speeds. When the bike says I'm doing 100mph, am I really only doing 88mph?

Has anyone else had this problem when going to the 14T front sprocket? And more importantly, is there any fix for it? Can Ducati update the software and tell the bike that it has a 14T front sprocket now instead of a 15T?
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Old February 15th, 2014, 06:56 AM   #2
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Old February 15th, 2014, 07:33 AM   #3
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Back in the day, speedo error would get you out of a ticket once. Had to get it calibrated then show judge.
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Old February 15th, 2014, 07:46 AM   #4
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Thanks, R6! Looks like what I need. But I did a Google search and can't find one for Ducati. All the ones coming up on eBay for Ducati say "NON ABS only" and obviously the Hyperstrada has ABS.

Any ideas?
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Old February 15th, 2014, 07:49 AM   #5
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These guys are saying the dealer can do a remap in order to correct the speedometer. Is that true? If so, can I just go to the dealer and have them correct the speedo?

Speedohealer problemo for mts 1200 standard - Page 2 - Ducati.ms - The Ultimate Ducati Forum
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Old February 15th, 2014, 07:58 AM   #6
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Check their website. I saw one there for my old R6 (which was 10% optimistic as delivered), but haven't tried looking for a Ducati one as the error is only about 4%.

The difference is easy to calculate, 15/14*100 = another 7% of error. That's way more than I would like. At least on the R6 you could ride by the tach in top; 6000 rpm = 60 mph. Not sure why you needed to make the change, I try to find seventh gear enough as it is.
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Old February 15th, 2014, 07:59 AM   #7
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Quote:
Originally Posted by HyperstradaHopeful View Post
These guys are saying the dealer can do a remap in order to correct the speedometer. Is that true? If so, can I just go to the dealer and have them correct the speedo?

Speedohealer problemo for mts 1200 standard - Page 2 - Ducati.ms - The Ultimate Ducati Forum
Pick up the telephone, find out!
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Old February 15th, 2014, 08:46 AM   #8
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Did you check to speedo before you installed the 14t cog ?

In the UK they need to within 10% lower, but no higher. Every car or bike I have owned or hired has had the speedo think its faster than the GPS speed reading.
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Old February 15th, 2014, 10:14 AM   #9
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I thought our bikes used the ABS signal for the speed reading, meaning that a sprocket change would make no difference?

Edit: found this older post of mine...

>I assume that with all the hi tech, the speedo should be accurate...

Well, it isn't. The manual even states that the ECU takes the computed value and adds 5%. And I think it's off closer to 7% but have my yet confirmed.

I read an article a couple of years ago that claimed that European regs dictate that a speedometer can never real lower than actual, for any 'reasonable' wheel and tire combo that an owner might put on. So they look for the dumbest over-profile tire someone could fit and figure the error from that case.

Last edited by porkrind; February 15th, 2014 at 10:17 AM.
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Old February 15th, 2014, 10:57 AM   #10
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Originally Posted by jamiesk View Post
Did you check to speedo before you installed the 14t cog ?

In the UK they need to within 10% lower, but no higher. Every car or bike I have owned or hired has had the speedo think its faster than the GPS speed reading.
Every Harley I've ever seen has an accurate speedo. Even says "certified" right on the face. That included my Buell, but without the marking. And both of our Mazdas ('13 MX-5 Club and '14 Mazda3) are similarly accurate, to one mph. So it can be done. Perhaps this is a trend.

Back when the USA had a 55 mph national speed limit, and speedos could not read higher than 85, there was an accuracy requirement. I had a couple of SR500s and a Rabbit (Golf) GTI that had perfectly accurate speedos then. But when they dropped the speed limit and speedo marking laws, they threw out the accuracy requirement as well. Bastids!
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