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**Mail2vasant** · 12-02-2011, 03:14 PM

Originally posted by martin_sky77 View Post

yes, i mean it won't hit 10k rpms on 6th gear...
did u hit the limiter on 6th gear? on stock bike?

since the speedo has deviation about 4% more, maybe if i can stick the 100/80-17 at front these number will decrease
(but guess there's not much space left between the fender and the stock tyre)

i've never hit the limiter in 6th and in my knowledge none of my friend has.

**Mail2vasant** · 12-02-2011, 03:19 PM

Originally posted by martin_sky77 View Post

hmmm...maybe we

should use the front and rear paddock, then start to turn the wheel (can try the front or rear first) by hands

until either the wheel exceed the 10km/h (each) and see is the abs indicator's light turn off

but since the speedometer reads from the front wheel, maybe it's the time to read the rear wheel rotation

a small correction. the speedo reads from the rear wheel in case of cbr250r.

And i dont get the point that if the rotation of the tyres affects the ABS, then how the profile/size of the tyre makes any difference to ABS system??

**martin_sky77** · 12-02-2011, 03:23 PM

Originally posted by Mail2vasant View Post

i've never hit the limiter in 6th and in my knowledge none of my friend has.

lack of torque at the top-end right?
that's why i want to try smaller (in diameter) tyre..better than adding 1 more tooth to the rear sprocket right?

**martin_sky77** · 12-02-2011, 03:35 PM

Originally posted by Mail2vasant View Post

a small correction. the speedo reads from the rear wheel in case of cbr250r.

is it from the front sprocket?

Originally posted by Mail2vasant View Post

And i dont get the point that if the rotation of the tyres affects the ABS, then how the profile/size of the tyre makes any difference to ABS system??

well, depends on how the ABS works..
IF the ABS reads the pulse from the (ex.) front tyre about (ex.) 60 pulse/rotation in (ex.) 1second, then the ABS's ECU convert it to a speed measurement (the circumference was factory programmed) and compare it with rear tyre or speedometer (depends which theory was true).

so if the circumference was changed (due the wheel size), then the calculations will miss..
the result can be like what MeTaL_MaNiaC said, that the front and rear braking distribution will miss
and in my case if the front was set up with 100/80-17 & rear 130/70-17, then the front circumference will be more, but the rear will be less

or maybe it will miss the ABS timing, since it will work after 10km/h..

confused? yes, i am

**MeTaL_MaNiaC** · 12-02-2011, 03:40 PM

Originally posted by martin_sky77 View Post

lack of torque at the top-end right?
that's why i want to try smaller (in diameter) tyre..better than adding 1 more tooth to the rear sprocket right?

IMO,Adding a tooth would be better to try as it wont affect the ABS in any way. I feel so because after paying a premium for ABS, if it doesnt function as it should then why to pay for it. Ofcoure, sprocketing may have its own disadvantages but spending Rs.27k extra and not using its full potential is more for me.
I think this topic can be disscussed in a seperate dedicated thread.

**Nithesh** · 12-02-2011, 03:43 PM

Originally posted by u4tobs View Post

Hi guys,
I'm new to this forum. After going through a few threads here, i'm excited to be a part of this community.
I've got my CBR in last august. Till now aorund 2800 kms done. Recently I've done a Mangalore-Kottayam-Mangalore which covered around 1000 kms. After this ride, i'm getting a strange rattling sound post 6k rpm.
Any idea how this can happen??

Also does anyone know where i can get motul chain lube in mangalore?

Welcome to the club!
By any chance do you hear that rattle comin from somewhere near the speedometer area?

Originally posted by hotshot.vipin View Post

all those who financed their bikes!!!
can you tell about the available Dwn paymnt n EMI options

HDFC - 80k Downpayment
4754/- a month for 3 years
This was the rate for the ABS(on road 1.99 lakhs) in the month of OCt

Originally posted by martin_sky77 View Post

lack of torque at the top-end right?
that's why i want to try smaller (in diameter) tyre..better than adding 1 more tooth to the rear sprocket right?

The 6th gear is ideal for highway touring

**martin_sky77** · 12-02-2011, 03:44 PM

Originally posted by MeTaL_MaNiaC View Post

IMO,Adding a tooth would be better to try as it wont affect the ABS in any way. I feel so because after paying a premium for ABS, if it doesnt function as it should then why to pay for it. Ofcoure, sprocketing may have its own disadvantages but spending Rs.27k extra and not using its full potential is more for me.

I think this topic can be disscussed in a seperate dedicated thread.

hmm..i think it'll still affect the ABS system (if the circumference matter) since the rear wheel will slower than the factory set..
also it's easier to search those tyres (also those tyre would be cheaper maybe?) than a slight bigger sprocket (if doesn't want to create one)..better to stick with factory tyres then?

but IMHO, the circumference won't matter since the algorithm would be so damn complicated..my friend has a cbr250r ABS with wider and smaller height ratio tyres, but dunno what's the diff..

yes, maybe there's should be an ABS system thread..

**MeTaL_MaNiaC** · 12-02-2011, 04:08 PM

@martin: The owner's manual says,
"The ABS control unit works by comparing wheel speed. Non-recommended tyres can affect wheel speed and may confuse the ABS control unit.
ABS does not function at low speeds (approximately 10km/h (6 mph) or below."
Pretty much that i said before.

And sprocketing would change the torque delivery to the rear wheel. But the rear wheel would still move in sync with the front wheel as the ABS control unit requires.

Yes, this topic needs a seperate thread. You can start one. Sorry people for going so much OT here (if it is). Couldn't resist as i am interested in the topic. Sorry once again. Mods may delete or move these posts if the thread is started.

**hotshot.vipin** · 12-02-2011, 04:18 PM

Originally posted by Nithesh View Post

Welcome to the club!

HDFC - 80k Downpayment
4754/- a month for 3 years
This was the rate for the ABS(on road 1.99 lakhs) in the month of OCt

thanks nithesh,.,.,
but i would be interested in knowin about the standard version coz of lack of moooolah

**sayhi2sai** · 12-02-2011, 04:31 PM

Originally posted by MeTaL_MaNiaC View Post

@martin: The owner's manual says,
"The ABS control unit works by comparing wheel speed. Non-recommended tyres can affect wheel speed and may confuse the ABS control unit.
ABS does not function at low speeds (approximately 10km/h (6 mph) or below."
Pretty much that i said before.

And sprocketing would change the torque delivery to the rear wheel. But the rear wheel would still move in sync with the front wheel as the ABS control unit requires.

Yes, this topic needs a seperate thread. You can start one. Sorry people for going so much OT here (if it is). Couldn't resist as i am interested in the topic. Sorry once again. Mods may delete or move these posts if the thread is started.

IMHO, this is one of the more relevant,useful and interesting discussion that has happened in a long time on this thread.

**Janesh.J** · 12-02-2011, 04:49 PM

ABS explained

An ABS system consists of the following components:

Some wheel speed sensors
Brake calipers
A hydraulic motor
Some pressure release valves
A quick thinking computer (or control module) which coordinates the whole process

Read more: ABS (Anti-lock braking system) technology

Found this on the net, though it is for cars, i guess it applies to CBR C-ABS. Seniors can elaborate on this.

**xxbomb** · 12-02-2011, 05:37 PM

Folks,

After lot of snooping around, finally got my hands on the soft copy of cbr 250r parts manual. This is not the scanned version, but the indexed and *proper* version out there. Enjoy!..

Multiupload.com - upload your files to multiple file hosting sites!

**ViggyRSA** · 12-02-2011, 06:26 PM

CBR250R Ride to LAVASA on sunday!

Hello guys,

Today i received a call from honda guys regarding the lavasa ride organised by them for all the Pune cbr250r owners.I would like to know how many of you guys have received the call and how many are in for the ride??

**hotshot.vipin** · 12-02-2011, 06:49 PM

koi mera doubt to clear kro,.,.,finance option of STD version to btao

**psr** · 12-02-2011, 07:16 PM

Originally posted by xxbomb View Post

Folks,

After lot of snooping around, finally got my hands on the soft copy of cbr 250r parts manual. This is not the scanned version, but the indexed and *proper* version out there. Enjoy!..

Multiupload.com - upload your files to multiple file hosting sites!

Thank you for the detailed parts manual ..Lots of info to assimilate.

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