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**riot** · 10-24-2012, 12:19 AM

Originally posted by sambitmishra4one View Post

hey riot, vasat and other friends what if i downgrade to 130/70 r17 pirelli ?
please urgent as right now i was going for tyre change and got the news that one set of 13/110 of pirelli is available, please give inputs, will it b a problem if i go for 130 for long rides and all ? any unstability or highspeed problem ?

I will second "icemang" bro on this. You can definitely go for a 130/70 Pirelli. Its actaully the best combo with 110/70 front.
Visually, there is hardly any difference between 140 and 130 section rear tyre.
As Sport demon is a sport tyre you will notice that CBR will lean is much faster in corners, wayy better wet road grip and because of less rolling resistance in SD, you will notice better acceleration and top-end.

**sambitmishra4one** · 10-24-2012, 01:04 AM

again i am confused, kya karun yaar ?

and which eoil is better ? ahell 10w40 ss or motul 10w40 300v ?
please

**sambitmishra4one** · 10-25-2012, 12:38 AM

hi friends, any body from kolhapur, will be taking rest over there for atleast 4-5 hrs, anybody ?

and updates-

tyres changed to contigo, real good now as very new, great cornering...........but after few kms again will be the same.....sad
eoil added 10w40 7100 single easter motul-750/can

**nsengg** · 10-25-2012, 11:03 AM

[QUOTE=icemang;885470]Hi Sambit,

The Pirelli 130 is a superb tyre, in fact THE best for the CBR and you should consider yourself a helluva lucky guy to get one as it is non-ISI = illegal for sale in our "great" nation. One big advantage over the 140 will be an artificial sprocket change of one cog less at the rear which will translate into higher speeds at lower RPMs.

Dear Icemang all about the grip and cornering are perfect but the 130 will be an artificial sprocket change of one cog more at the rear which will translate into lower speeds at the same RPM's
For 130/70R17 the diameter of the tire would be 613.8mm & circumference 1.927mts whereas
For 140/70R17 the diameter of the tire would be 627.8mm & circumference 1.971mts

**vEnOm_2210** · 10-25-2012, 04:43 PM

Booked !!

Finally CBR250R ABS Booked..

Delivery in a week's time.

Excited..

**rajpandey10** · 10-25-2012, 04:51 PM

Originally posted by vEnOm_2210 View Post

Finally CBR250R ABS Booked..

Delivery in a week's time.

Excited..

Congratulations.

One question, i wanted to check fuel economy of my cbr, i am using the full tank method, just wanted to know how much kms it is safe to run when the fuel meter starts blinking ? just want to have an idea for how much kms i am safe to re-fuel.

**RanjithMN** · 10-25-2012, 05:08 PM

Replaced the Oil Filter w/o replacing the gasket and oil is leaking now.R/P the gasket later and there is still some leak.Has anyone had this issue?

Originally posted by icemang View Post

Hi Sambit,
The CBR is supposed to be shod with 130/70 R17s at the rear and NOT the 140s. Honda has done this to give a more macho look to the bike.

That is wrong info my friend.CBR or any 250 for that matter only requires a 130 at the most.that is true but HONDA hasn't simply shod a 140.The rims are designed for 140/70!

anyway,the PSD 130/70 has much lower speed & load ratings than the stock tires.MRF'z revs 150/60 is a great tire,direct fit.its the DUKEs rear tire.Highly recommended.that+PSD at front=\m/

**icemang** · 10-25-2012, 07:18 PM

Originally posted by nsengg View Post

Dear Icemang all about the grip and cornering are perfect but the 130 will be an artificial sprocket change of one cog more at the rear which will translate into lower speeds at the same RPM's
For 130/70R17 the diameter of the tire would be 613.8mm & circumference 1.927mts whereas
For 140/70R17 the diameter of the tire would be 627.8mm & circumference 1.971mts

Dear nsengg,

You might like to compare the two tyres side by side like I did to check which is the TALLER of them. The 140 is and by a significant margin.

My friend, a tyre with a lower circumference is easier to rotate than a tyre with a greater one, right? And this phenomenon is applicable at all speeds, from 1st to 6th, as it is a hardware change. Please work out the number of rotations the 130 will do over a 1km distance vis-a-vis the 140. This means that for the same number of engine revs per time, the 130 is travelling faster.

This also means that ALL gears will be higher. For the CBR, which has a real peaky 1st, it should not matter. But in 6th, I guess the 130 will give atleast a 500 RPM advantage.

The is a World Of Sprocketing here, you could check it out.

**vEnOm_2210** · 10-25-2012, 08:14 PM

Originally posted by rajpandey10 View Post

Congratulations.

One question, i wanted to check fuel economy of my cbr, i am using the full tank method, just wanted to know how much kms it is safe to run when the fuel meter starts blinking ? just want to have an idea for how much kms i am safe to re-fuel.

Thanks...

Full tank method is fine.. last meter indicates 3.5 ltrs remaining. Since members say its advisable to have 3 lts atleast in the tank coz its an FI.. its advisable to refuel. but you can travel around 90 kms roughly...

travel about 30 kms & refuel...

**nsengg** · 10-25-2012, 08:44 PM

Originally posted by icemang View Post

Dear nsengg,

You might like to compare the two tyres side by side like I did to check which is the TALLER of them. The 140 is and by a significant margin.
Right, the 140 would be taller by 14mm which is indicated in my previous post.

My friend, a tyre with a lower circumference is easier to rotate than a tyre with a greater one, right? And this phenomenon is applicable at all speeds, from 1st to 6th, as it is a hardware change. Absolutely right.

Please work out the number of rotations the 130 will do over a 1km distance vis-a-vis the 140.
The 130 will have to do 518.94 rotations to cover a distance of 1 km. &
the 140 will have to do 507.35 rotations to cover a distance of 1 km.

This means that for the same number of engine revs per time, the 130 is travelling faster.
Here you are absolutely wrong:
Hence for the same number of engine revs per time the 130 will be rotating the same but will be covering a lesser distance (It will actually be travelling slower not faster as mentioned by you).

Another way to put it across would be:
Speed=Distance travelled/Time taken
Hence if you intend to cover the same distance in the same time the bike with a 130 will have to rev more as compared to the bike with the 140.

This also means that ALL gears will be higher. For the CBR, which has a real peaky 1st, it should not matter. But in 6th, I guess the 130 will give atleast a 500 RPM advantage.

The is a World Of Sprocketing here, you could check it out.

Dear Icemang my reply as above in bold.

**Binoy** · 10-25-2012, 09:19 PM

Originally posted by RanjithMN View Post

anyway,the PSD 130/70 has much lower speed ratings that the stock tires.MRF'z revs 150/60 is a great tire,direct fit.its the DUKEs rear tire.Highly recommended.that+PSD at front=\m/

A noob question. A N250R is running on a PSD 130/70/17 setup in USA(or some other countries) rite? Then how will it effect when it comes to CBR250R?
Leave the rims size and all.

**Nithesh** · 10-25-2012, 10:01 PM

Originally posted by icemang View Post

Hi Sambit,

The CBR is supposed to be shod with 130/70 R17s at the rear and NOT the 140s. Honda has done this to give a more macho look to the bike.

Wrong. almost all sports tourers are given a broader rear tyre to accomodate heavier touring loads, and still be able to transmit enough torque onto the road to setoff with ease. The problem lies with everyone putting HP over Torque figures.

**RanjithMN** · 10-26-2012, 02:38 AM

Originally posted by Binoy View Post

A noob question. A N250R is running on a PSD 130/70/17 setup in USA(or some other countries) rite? Then how will it effect when it comes to CBR250R?
Leave the rims size and all.

N250 runs on the same spec here in India too.I dint get your question exactly.
if a CBR is properly setup for a 130/70 would make it more agile and slightly faster.a proper setup for a250 can have even thinner tires.the thinner the tire,the better as long as it can transfer and handle the load/power properly.

The point made by Niteesh is very true too,forgot to mention it earlier.

Originally posted by Nithesh View Post

Wrong. almost all sports tourers are given a broader rear tyre to accomodate heavier touring loads, and still be able to transmit enough torque onto the road to setoff with ease. The problem lies with everyone putting HP over Torque figures.

**icemang** · 10-26-2012, 11:14 AM

Originally posted by Nithesh View Post

Wrong. almost all sports tourers are given a broader rear tyre to accomodate heavier touring loads, and still be able to transmit enough torque onto the road to setoff with ease. The problem lies with everyone putting HP over Torque figures.

I had read some interview/article about the design of this brand new CBR and this particular aspect was stated by, if I am not wrong, by one of the senior members of the design team hence I put it here...

A broader tyre does not at all translate into greater load carrying ability. Rather, it is the construction, most specifically, the number of plies that matter. Check the ply difference between bicycle, car, light truck, heavy truck and wheeled armoured vehicles. As the ply count increases, the overall size of the tyre has to increase.

In the case of a bike, what the broader tyre will do is give better straight-line stability but at the cost of cornering agility.

**aman15** · 10-26-2012, 11:18 AM

one question :
suppose i am downsizing or upsizing the rear tyre so is it necessary to change the sprocket also ??? what if i do not change the sprocket ???

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