How correct is speedo?

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How correct is speedo?

Post  dudeofrude on Sat Jun 27 2015, 16:31

I'm just wondering how far it's out at high speed??
Say hypothetically somebody found a 5 mile straight just outside Peterborough and possibly maxed out they're thundercat with the speedo reading 160mph (5 mile an hour faster than its even capable of going?)
Realistically what speed would that have been?
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Re: How correct is speedo?

Post  SteveCat on Sat Jun 27 2015, 19:35

It's probably 10% out if not more - so 140 ish
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Re: How correct is speedo?

Post  dudeofrude on Sat Jun 27 2015, 20:19

Thanks steve :-)
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Re: How correct is speedo?

Post  Digger1981 on Sat Jun 27 2015, 21:12

Thinking Hypothetically about your hypothetical conundrum, I reckon at such a hypothetical speed id have no idea what the speedo would hypothetically read as I'd be far too scared to look at it!!!!!
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Re: How correct is speedo?

Post  0ldcat on Sat Jun 27 2015, 21:30

[You must be registered and logged in to see this link.] wrote: . . . as I'd be far too scared to look at it!!!!!
No you wouldn't . . . . trust me, . . . you'd still peek Shocked

A group of us from the forum went on a trip to the Nürburgring, and the last straight before the ring exit just begs for wide open throttle. A few of us saw the same sort of readings from the clocks of our Cats. . . but as SteveCat says, after 10%ing the reading (down), we reconed on 140 ~ 145mph.

BUT you do sneak a peek at the speedo green smile
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Re: How correct is speedo?

Post  biscut on Sun Jul 05 2015, 17:43

According to the speed awareness course that I recently had to go on (read that as voluntarily signed up for) the newer speedo's are only 2-3 mph out (if your Speedo reads 50 then you are doing 48ish). This could just be them trying to get people to slow down but the guy seemed genuine enough.
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Re: How correct is speedo?

Post  dudeofrude on Sun Jul 05 2015, 17:57

Yeah digital ones are meant to be a bit more accurate but my 19 year old analogue one will be quite out I would think. It's not bad at low speeds when I compare it on them 'know your speed' signs.

I do prefer analogue dials for the fact that as long as the needle is around the 30 then as far as I'm concerned I'm doing 30mph (even if it's half way between 30 and 40 lol). Where as with the digital ones as soon as it says 31 you sort of feel like a criminal haha
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Re: How correct is speedo?

Post  Wooster on Sun Jul 05 2015, 19:26

You also lack an excuse if you drive the older Honda Civics with the digital display. The Cops can clearly read it through the drivers window. green smile
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Re: How correct is speedo?

Post  Radar on Sun Jul 05 2015, 22:49

Probably about 5% out at least, but still a good effort, if only in theory Wink
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Re: How correct is speedo?

Post  biscut on Mon Aug 24 2015, 20:25

It's been confirmed that my Speedo is at least 5-10mph out as I keep getting asked why I am riding slowly on observed rides when my Speedo is reading the posted limits!! I bet they would complain if I was speeding everywhere lol
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