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**pravin.murthy** · 05-12-2012, 12:44 AM

Originally posted by dreamseller View Post

Even in perfect conditions, given the below two facts:

1. The rev limiter cuts at 10500RPM on the meter.

2. The 6th gear being a true overdrive gear (gear ratio ~0.96).

the speed-RPM-gear combo you've mentioned is impossible.

P.S. Unless of course, your idea of 'perfect condition' includes a slope.

P.P.S. Even it were to, hypothetically, touch the rev limiter at 10.5k RPM on the meter (in 6th gear), the speedo would show 168km/hr.

Couldn't agree more.

Answer for your points 1 & 2:-

On the meter the bike revs till 11600 rpm and not 10500 rpm as you have mentioned my friend... It revs to 11600 rpm in the first 4 gears for sure but cant reach that rpm in the top 2 gears.

My idea of perfect combination was the best mixture of things that could make the bike go the fastest in real life conditions... In that case in stock form CBR250R reaches 164 k/h... The bike would be doing 11000 rpm on the tacho in the bike....

In the true sense - the bike while doing 164 on the meter, the genuine speed would be 155 k/h.

While the tacho would be doing 11000 rpm on the meter, the genuine rpm would be close to 9700 rpm.

Happy Riding :-)

**pravin.murthy** · 05-12-2012, 12:48 AM

Originally posted by Mail2vasant View Post

How do u know all these data. I mean what's the source??

The Answer is - ready for it.... here it comes.... - MAGIC!! :-)

Well to be serious, its all a bit of R&D my friend with various source of information available around us... I dont own a CBR 250R to have known the above things... But whatever Ive mentioned above.. is the best of my knowledge...

For your info I have a lot of interest in these kind off stuff.... Ive been into these things for more than a decade now... not only with bikes but also with cars.... So its basically just interest... thats it :-)

Happy Riding :-)

**aargee** · 05-12-2012, 12:50 AM

With due respect pravin.murthy saar...

Originally posted by pravin.murthy View Post

in stock form CBR250R reaches 164 k/h... The bike would be doing 11000 rpm on the tacho in the bike

Are you sure about this point? Have you done this or is it just hypothetical? If you've done, please put up the stretch where you've done.

Originally posted by pravin.murthy View Post

While the tacho would be doing 11000 rpm on the meter, the genuine rpm would be close to 9700 rpm

Is it the case with CBR 250R or with any other bike like R15, Ninja 250R or CBR 150R?

**piyush2112** · 05-12-2012, 12:55 AM

top speed

More questions. (my answers inline).

Originally posted by pravin.murthy View Post

1. The average genuine top speed recorder by the 3 top magazines of the country - Autocar, Overdrive and Bike India for CBR 250R is 148 k/h (ABS version).

I think as always they used GPS and not the console. I am talking about bike console reading.

2. The non ABS version, with its 6 kg lesser weight, could acheive more both in top speed and acceleration.

Agreed.

3. 148 k/h genuine is 157 k/h in the meter of the bike.
I think you are talkign about the 6% optimistic speedo.

4. Most importantly, like how the speedometer over reads on a bike, the tacho showing the revs also over reads... and this is a factor most people forget while calculating or not aware....

not aware of that and need to do a little more research. Could you please explain the logic behind such set up? Japanese bikes are supposed to be 6% optimistic than actual (94 GPS speed is displayed as 100 on CBR console) and that is as per law of land. The law is indirectly applicable in over speeding scenarios but i have never heard of over revving law, so dont understand the logic behind optimistic tacho reading.

5. 9000 genuine rpm on CBR250R is equal to approx 10,200 rpm on the bike's meter....

Please explain.

6. The max possible speed the bike can touch on the meter (both speedo and tacho) with the most perfect conditions in a stock form is 164 k/h which is at 11,000 rpm in 6th gear. This speed though is very unlikely to achieve in real life conditions.

164 is true as per gearing ratio (if i recall correctly someone did calculations based on the RPM and gearing ratios and based on those numbers he predicted similar figure) And yeah i personally have touched 162 on NICE road in bangalore on my stock bike and I weigh 71Kg and that day the bike was having fuel less than half tank. Everytime I hit that highway, I always try to do a little more than my last figure, have done 156-159 n number of times.

Hope I have thrown some light on the bike's top speed :-)
yeah you did

Happy Riding..

**psr** · 05-12-2012, 01:28 AM

I visit this thread often, though not as an owner,but to learn ,and gain knowledge. I wonder why again the thread is discussing top speed,RPM, etc.which had been done many times over before......are the owners not happy, and are unsure of the bike's capability ,or the purpose for which it was bought, or something else which i fail to understand...
I guess in the absence of any serious issue , we are simply "Chewing the cud of bygone vision".
A proper Dyno test by one of the owner will put to rest all speculations.
No offense meant towards anyone.

**aargee** · 05-12-2012, 01:34 AM

Originally posted by psr View Post

are the owners not happy, and are unsure of the bike's capability ,or the purpose for which it was bought, or something else which i fail to understand

100% happy, but Sir, this topic of top speed was bought by a non owner that may or may not be hypothetical out of his own interest & then got carried away. Most owner's here speak ONLY about real time experience & not about situations.

Originally posted by psr View Post

I guess in the absence of any serious issue , we are simply "Chewing the cud of bygone vision"

+1; sadly...have to agree

Originally posted by psr View Post

A proper Dyno test by one of the owner will put to rest all speculations

From day one, I've been wanting to do this; heard PBK (now KTM) has dyno, but not sure though. Would really like to test it even if I've to pay from my own pocket. Any suggestions Sir as where we could get this tested?

PS - Its always a pleasure learning from people who're experienced, undergone, know the facts. Such posts are always welcome & 101% not offending at all. Be it from PSR Ji or from pravin.murthy

**psr** · 05-12-2012, 01:43 AM

Originally posted by aargee View Post

From day one, I've been wanting to do this; heard PBK (now KTM) has dyno, but not sure though. Would really like to test it even if I've to pay from my own pocket. Any suggestions Sir as where we could get this tested?

PS - Its always a pleasure learning from people who're experienced, undergone, know the facts. Such posts are always welcome & 101% not offending at all. Be it from PSR Ji or from pravin.murthy

Thanks for understanding...From my talks with few Ninja owners,Delhi and Bombay PBKs have Dynos and was told that most PBKs have Dyno set up .Will try to look up and find out

**kimshine** · 05-12-2012, 01:45 AM

mY bike is making a sound similar to sound By mouse like chu chu

its coming from somewhere near the handle bar or might b from front part somewhere
any suggestions what it could b

**dreamseller** · 05-12-2012, 02:03 AM

Originally posted by Mail2vasant View Post

Yes same pinch.. Which colour do u have??

Same to same hai ji!! Grey/Red.

Originally posted by psr View Post

I guess in the absence of any serious issue , we are simply "Chewing the cud of bygone vision".

Couldn't help but smile at the above statement.

Originally posted by aargee View Post

100% happy, but Sir, this topic of top speed was bought by a non owner that may or may not be hypothetical out of his own interest & then got carried away. Most owner's here speak ONLY about real time experience & not about situations.

No offense to Mr. Pravin Murthy and maybe he's actually very knowledgeable, but I couldn't reason with him because my knowledge comes from using the bike daily and his comes from reading from different sources. Hence, I choose not to carry on with my point.

Originally posted by aargee View Post

PS - Its always a pleasure learning from people who're experienced, undergone, know the facts. Such posts are always welcome & 101% not offending at all. Be it from PSR Ji or from pravin.murthy

+100.

Originally posted by kimshine View Post

mY bike is making a sound similar to sound By mouse like chu chu

its coming from somewhere near the handle bar or might b from front part somewhere
any suggestions what it could b

My guess is it's from the front discs. I've had a similar issue and the SVC guy just blew pressurized air after opening the calliper and the sound was gone. He said that there was dirt inside the calliper and that made the sound.
However, I can't say if it's the coneset as I haven't heard the sound of a coneset gone kaput.

**abhiwar** · 05-12-2012, 12:32 PM

Originally posted by kimshine View Post

mY bike is making a sound similar to sound By mouse like chu chu

its coming from somewhere near the handle bar or might b from front part somewhere
any suggestions what it could b

Need to clean brake pads and disk

**srivaatsav** · 05-12-2012, 02:41 PM

Originally posted by MADCATR View Post

Chandru/Aargee: Checked with the chennai dealers Kun, Didar, & Manasorovar, all are quoting 30-45 days for ABS model. Manasorovar has STD model black in stock but not sure if its 2012...

Try SVM Honda ,Kilpauk .... Relatively new showroom and not many know about this .. May be you could get quick !
Please give it for service either in didar t.nagar , JSP or MPL ! Got very good reviews there !

Originally posted by siddhesh View Post

Conti-Go is available in many tire shops in mumbai an is priced rm 3200-4000 range

I dont understand when the MRP says 2690 .... why do they charge beyond Rs3000 ?

Originally posted by aargee View Post

Bargain...Bargain...Bargain!!! It might not cross more than 3K; I did the mistake of trusting one shop. But Srivaastav here in Chennai got an excellent deal, just because he inquired at multiple shops. When you bargain, ensure that, free fitting is included in that price.

If Conti is not available, check for Dunlop; members say Dunlop is good too.

.

Not just Bargain ... make them understand you are selling beyond MRP ! Max it should be 3000 k inclusive of all etc etc taxes !!

Tested dunlop only in dry surface ... One word -- Outstanding
Did not try in wet surface .. Reason ... No rains or signs of any coming soon to chennai !

**icemang** · 05-12-2012, 06:30 PM

Tyre swap between 150 and 250?

Hello everybody,

I am utterly fed up with my stock Continentals and was looking for tyres with more ribbed treads that would be deeper too - all the better to handle varied road surfaces.

Now, I found that the 150 seems to have been given some very good rubber by MRF from their Nylogrip range. I can personally vouch for the superb overall performance of the Nylogrip range as I have been using this type on my 2002 Pulsar Classic.

For ease of reference, here are the sizes:

Front Rear

150 100/80 X 17 130/70 X 17

250 110/70 X 17 140/70 X 17

NOTE:

Front: The tread of the 150 is actually a little wider at 80mm as compared to the 77 mm for the 250!

Rear: The sizes of the 250 are very similar to those of the 250 with just a 10 mm lesser width on the 150 for the same rim size which translates into 91 mm tread for the 150 and 98 mm for the 250.

Only rim sizes need to be checked for compatibility. If we know of Honda's cost - cutting expertise, I daresay that both bikes would have exactly the same rims!

I venture the following advantages in this swap:

1. Better performance on roads with different surfaces - gravel, rain, slush etc thanks to the greater quantity of ribs and their increased depth over the Continentals.

2. Better cornering (for those so inclined and there is an acute surfeit of these enthusiasts here

) due to the slightly narrower rear tyre which should flip into corners better than the wider Continentals.

3. Lower price (hopefully) due to totally indigenous design and manufacture by MRF. Better availability too.

Comments please?

**Mik** · 05-12-2012, 06:51 PM

Originally posted by icemang View Post

Hello everybody,

I am utterly fed up with my stock Continentals and was looking for tyres with more ribbed treads that would be deeper too - all the better to handle varied road surfaces.

Comments please?

Today i was at the CBR showroom(contemplating buying one to ride to ladakh this june) and had precisely these thoughts. Checked the rim sizes by hand and felt that the 150 rim size is atleast an inch shorter than the 250

I might have got it wrong though.

**Bipr15** · 05-12-2012, 10:24 PM

Guys i've done my 1st servicing at 1000 km now my bike is on 3000 km on odo should i take my bike to servicing ? Facing no issues at all plz advice thanks

**xxbomb** · 05-12-2012, 10:42 PM

Originally posted by Bipr15 View Post

Guys i've done my 1st servicing at 1000 km now my bike is on 3000 km on odo should i take my bike to servicing ? Facing no issues at all plz advice thanks

How about checking the service manual for the time interval for service?..

Originally posted by icemang View Post

Hello everybody,

Front Rear

150 100/80 X 17 130/70 X 17

250 110/70 X 17 140/70 X 17

NOTE:

Front: The tread of the 150 is actually a little wider at 80mm as compared to the 77 mm for the 250!

Rear: The sizes of the 250 are very similar to those of the 250 with just a 10 mm lesser width on the 150 for the same rim size which translates into 91 mm tread for the 150 and 98 mm for the 250.

Only rim sizes need to be checked for compatibility. If we know of Honda's cost - cutting expertise, I daresay that both bikes would have exactly the same rims!

I had been thinking a while about the options for rear tyre. MRF Zapper-Q and Dunlop tuffgrip are available off the shelf and its the same profile as stock tyres. I'll try getting the prices of the tyres on 150r on monday. Hmm...Is Zapper-Q nylon threading too?..or different from the 150r's tyre?

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