Tire size and Speedo error calculator

kpzen · 30th October 2007, 23:20

Quote:

Originally Posted by adisseril

what is the ideal size of rim/tyre for maruthi esteem

175/70-13 on 5j rims but the stock 4.5j rims will also do

rider60 · 30th January 2008, 03:37

Tire Calculator

this calculator gives the rim size difference and error too check it out, i used it to calculate for my swift upgrade!

SirAlec · 13th April 2008, 22:54

Tyre Size calculator. (not online/web based tool,)

Its a standalone flash based tool. You need Adobe/macromedia flash player 9.

[COLOR=#0000ff]http://rapidshare.de/files/39107919/tyre_size_calculator.swf.html[/COLOR]

Download and use!

Magnan · 14th April 2008, 00:15

I am using 175/70/13 tires(sorry this time MRF,rough ride)on Cielo. Can I go for 14" ? What affects will I experience? Bridgestones gave me 80000 kms.

akshay4587 · 4th October 2008, 15:59

Now this calculator has made me scratch my head regarding the speedo error thing

My car Does 100Km/hr at 2750 RPM on stock tyres.

If I upgrade to 196/60/14 the Difference would be 2.5%.
70MPH would be 71.5 MPH.

that means speedo will show less reading for a particular RPM than stock tyres.

Shouldnt it be more since the overall diameter is increasing and the car would be revving less?

Asking this since my bike used to do 100@6.5K RPM on stock tyres
after upsizing one size it did 100@6.2K RPM

Sudipto-S-Team · 4th October 2008, 19:01

RPM has no connection to your speedo reading. The speedo takes its reading by calculating the number of revolutions in the tyre - so if the tyre becomes larger or smaller the speedo reading will change accordingly.
The RPM reading that you see in the dashboard instrument panel is related to the engine's working speed. Not really connected to the speedo in any way.

rajchetan · 5th January 2009, 18:42

Hi
Tire size calculator

Another web site that helps you right size the tyre for your Car.

i hope its helpfull

schakravarthy · 20th December 2013, 13:26

Can someone please solve my confusion??
The stock tyre size of a Fiat Punto Active variant is 165/80-R14, Emotion is 175/70-R14 and Emotion Pack is 195/60-R15 (pre-2012 models).
Now, according to the tyre size calculator, it is not recommended to up-size the Active variant to the tyre size of an Emotion/E Pack variant, or up-size an Emotion variant to Emotion Pack's tyre size.
I for one, don't believe that Fiat would calibrate the meters differently for different variants; it just doesn't make sense.
What's the funda here? Is it a plain goof up on the part of Fiat India or is there some basic reasoning that eludes me?

ashis89 · 14th April 2016, 15:55

I am looking to upgrade the stock tyres (155/65 R14) of my WagonR. Though I have the option of 165/65 R14 I am more interested in 175/65 R14. The error due to the upsize is going to be 4.7% in the latter versus 2.3% in the former. Should I go ahead with this upgrade?
There is another alternative of 175/60 R14(1.5%) but I don't see any tyre brands offering them (available in GY GT3 and Yoko A-Drives only).

30th January 2008, 03:37	#32
rider60 Senior - BHPian Join Date: Mar 2007 Location: Bhagyanagaram. (A.K.A. Hyderabad) Posts: 1,620 Thanked: 56 Times View My Garage	Tire Calculator this calculator gives the rim size difference and error too check it out, i used it to calculate for my swift upgrade!
	() Thanks

13th April 2008, 22:54	#33
SirAlec Senior - BHPian Join Date: Sep 2006 Location: zxc Posts: 3,393 Thanked: 726 Times	Tyre Size calculator. (not online/web based tool,) Its a standalone flash based tool. You need Adobe/macromedia flash player 9. [COLOR=#0000ff]http://rapidshare.de/files/39107919/tyre_size_calculator.swf.html[/COLOR] Download and use!
	() Thanks

14th April 2008, 00:15	#34
Magnan Newbie Join Date: Mar 2008 Location: Mumbai Posts: 14 Thanked: 0 Times	I am using 175/70/13 tires(sorry this time MRF,rough ride)on Cielo. Can I go for 14" ? What affects will I experience? Bridgestones gave me 80000 kms.
	() Thanks

4th October 2008, 15:59	#35
akshay4587 Senior - BHPian Join Date: Mar 2005 Location: Chandigarh/Mohali/Ambala Cantt Posts: 4,151 Thanked: 4,525 Times View My Garage	Now this calculator has made me scratch my head regarding the speedo error thing My car Does 100Km/hr at 2750 RPM on stock tyres. If I upgrade to 196/60/14 the Difference would be 2.5%. 70MPH would be 71.5 MPH. that means speedo will show less reading for a particular RPM than stock tyres. Shouldnt it be more since the overall diameter is increasing and the car would be revving less? Asking this since my bike used to do 100@6.5K RPM on stock tyres after upsizing one size it did 100@6.2K RPM
	() Thanks

4th October 2008, 19:01	#36
Sudipto-S-Team Senior - BHPian Join Date: Jun 2007 Location: Kolkata Posts: 1,320 Thanked: 290 Times View My Garage	RPM has no connection to your speedo reading. The speedo takes its reading by calculating the number of revolutions in the tyre - so if the tyre becomes larger or smaller the speedo reading will change accordingly. The RPM reading that you see in the dashboard instrument panel is related to the engine's working speed. Not really connected to the speedo in any way.
	() Thanks

5th January 2009, 18:42	#37
rajchetan BHPian Join Date: Oct 2004 Location: Thailand / Vietnam / HK / Bangalore Posts: 365 Thanked: 146 Times	Hi Tire size calculator Another web site that helps you right size the tyre for your Car. i hope its helpfull
	() Thanks

20th December 2013, 13:26	#38
schakravarthy Senior - BHPian Join Date: Dec 2013 Location: KA 09 / KA 02 Posts: 1,431 Thanked: 4,479 Times	Can someone please solve my confusion?? The stock tyre size of a Fiat Punto Active variant is 165/80-R14, Emotion is 175/70-R14 and Emotion Pack is 195/60-R15 (pre-2012 models). Now, according to the tyre size calculator, it is not recommended to up-size the Active variant to the tyre size of an Emotion/E Pack variant, or up-size an Emotion variant to Emotion Pack's tyre size. I for one, don't believe that Fiat would calibrate the meters differently for different variants; it just doesn't make sense. What's the funda here? Is it a plain goof up on the part of Fiat India or is there some basic reasoning that eludes me?
	(1) Thanks

14th April 2016, 15:55	#39
ashis89 Distinguished - BHPian Join Date: Aug 2011 Location: Bengaluru Posts: 3,469 Thanked: 10,967 Times View My Garage	Re: Tire size and Speedo error calculator I am looking to upgrade the stock tyres (155/65 R14) of my WagonR. Though I have the option of 165/65 R14 I am more interested in 175/65 R14. The error due to the upsize is going to be 4.7% in the latter versus 2.3% in the former. Should I go ahead with this upgrade? There is another alternative of 175/60 R14(1.5%) but I don't see any tyre brands offering them (available in GY GT3 and Yoko A-Drives only).
	() Thanks