I might not own a P180 but this post is regarding speedo error in general.
Stock speedometer calibration in motorcycles direct from the manufacturer can read 2-10% fast.
There is no point discussing what is the actual speed unless we have data through a speed gun or other reliable sources.
Apart from the speedometer, errors can come due to transmission changes, wheel and tyre changes can also add to the error.

+ 1
Finally we are getting somewhere
Error is there but it's constant.

Read this thoroughly if you want to understand what's wrong with speed reading :

Assume this if you are riding at 120 on speed gun and your speedo meter is adding lets say 7 kms means it's showing 127...summary is that it's always going to show 127 (if actual is 120) not the 130, or any fcuking random thing...once we know that constant we can calculate actual speed..

How does the speed get calculated ?
This thing runs on pulse technology not on ancient magnetic wheel (seen in autos)...in this technology pulses are created at front wheel as it rotates...more rotations per second more are the pulse...than these pulses are counted inside speedo circuit and we get to see the speed on speedometer...its important to understand that this technology is working on pulse basis and not on the voltage basis.

Then where is the error coming from ?
To understand this we will have to consider an example...
suppose front wheel creates 3 pulse per second at actual speed 20 kph
so speedo calculates the speed like : 3 x 6.66 = 19.98 (rounding to 20)
and at 4 pulses per second : 4 x 6.66 = 26.64 ( rounding to 27)
so if u drive at any speed in between 20 and 26 it's always going to create 3 pulses only but after 26 kph it will be creating 4 pulses...
meaning speedo will show 20 kph for any speed in between 20 to 26 kph and so forth...
This example has assumed values but above scenario is true and that's where the error is coming from....in reality pulses count is greater than speed number meaning at the speed of 20 there must be more than 30 -40 pulses are getting created....
If in future if those pulses are increased by the company then we will have more precise reading almost perfect like 99.99% but it never will be 100%...its the limit of technology...
If you had studied the calculus > limits in school then you can easily understand what I'm saying

Then if there's error problem with Digital Speedos then why the hell are we using them?
its simple because they are maintenance free and produce consistent result...for example if new bike is showing 130 at actual speed of 120 same bike or same model even after 20 is going to show same 130 reading at actual speed of 120...
So this little drawback of speed error is compensated with hug advantage it comes with...

God bless those who simply can't accept P180 going beyond 120 or are doing false accusation of well maintained bike
and also those retarded who blames Bajaj for this error and simply can't see that error comes with technology and not with the company

That was very informative.

please have a look at the top speed of the Bajaj Pulsar 180 dtsi on this link(from the bajaj website).

I finalized my decision of buying this P180 after reading those reviews last year ...
anyway thanks because now I can fix confused links

Bingo

I found that error constant that I was talking about thanks to revtech and autocar who has provided speedo and true speeds
speedo/true

80/74
100/93
120/111

if we divide them we get 1.081, 1.075 and 1.081 respectively..and now approximating them (1.081 + 1.075 + 1.081) / 3 = 1.079

So constant is 1.079

How to calculate actual speed?

simple just divide speedo speed by our constant 1.079
my bike has attained speed of 131 on speedo so the actual speed will be 131 / 1.079 = 121.4 kph
I think 121.4 value is greater than 120
this 131 wasn't the highest speed on my bike because next moment I ran into traffic signal
I know somebody who had attained 137 on P180

These auto reviews are not reliable

only the speedo/true speed thing is reliable because I told you speedo are consistent

they are not reliable because :
1. new engines can't go to at its most (tell me if I'm wrong)...newly bought bikes struggle to reach 10k or 11k RPM...which explains why autocar is showing highest speedo speed 120 but my bike can go to 131.
2. City economy according to autocar is 43.3 and according to zigwheel it's 66...whom to believe?
and many other

I agree with u buddy..! ur info sounds credible enuf to beliv...!

These auto reviews are DEFINITELY not reliable ..and i feel they are always biased, more towards honda or yamaha bikes.. dont know wht animosity they share with Bajaj...?

But, True, Pulsar180 is capable of crossing 135 on speedo atleast..!
Even Pulsar owners will not agree coz most them go by the reviews and comparisons found on blogs..!thus ,mostly underestimating/disrespecting my beloved Pulsars.!

U've got to be skilled in ripping ur bikes and more so, u shd be able to feel/understand ur bikes...and Beliv me not everyone can do so..!

Very well said..!

No Body is Blaming Bajaj Bro ... So chill...And We know u have got fastest Pulsar among all ...
Cheers..
&
Thanks for all tht info...

i thought the person writing the article was a respected member on xbhp. but since your saying his word is not to be taken seriously im sure you have your reasons."auto reviews are DEFINITELY not reliable" im just going to laugh to that.being biased is one thing but not reliable..LOL

180 capable of crossing 135 Kmph on the speedo is not true speed.im trying to say the true speed cannot be more than 120.you can cross 150 on a badly calibrated speed with a change in tyre size etc but it is not true speed.

im sure you have more skill than the people who test ride the bikes for top speed in near perfect conditions on track. i dont think they can feel/understand the bike like you do.

cheers to that

120 sounds about right.may go faster if
you weigh less than 50 Kgs,
going downhill
nill wind conditions
higher tire pressure

when you say newly bought what do you mean.after run in i redlined my bike way into the 10k range

economy figure off 66 is obiously incorrect.unless they confused it with the 150


im not here to argue with any one.im just trying to point out that you may hit a 150 plus on the speedo but true speed cannot be more than 120-125ish

@revtech: Let us not drag any names into this please!

edited.
no disrespect to any one.

Speed WAR should be finished now guys, For those who believe's that true top speed is more than 120kmph, let it be. and same for other group of guys who does'nt believe in it, like me.

all those who own 180 dtsi please open your owners manual to page 2 and take note of the top speed of the bike printed by bajaj.

or wait is that UNRELIABLE as well ?

Guys can we hold on this, no offense to any one...

Please change the topic...

@Abhi teri saari problem solve ho gayi kya ya teri bike mein aur koi new problem nahin aa rahi please place the concern or any problem immediatley on this thread so as to "Move On" ...

You are probably talking about old Manuals, New/UG4 manuals are not provided with top speeds.

Abhi tau gaadi theek chal rahi hai, ek problem thi, I mentioned it here that my bike was not starting when in neutral. Yeh problem neutral switch change karne ke baad gayab ho gayi.
Untill my good times turns upside down, Lets hope that there are not any problems.

And yes, I will mention each and every problem that i face here on this thread, no matter if it is small or ... you know??