lower top speed after tire change

maxbhp · 26th May 2006, 18:05

Quote:

Originally Posted by pankaj09

hey ,
i maybe incorrect on this, but isnt the speedo calibrated for a 12inch wheel.
so if the wheel size is increased then the reading changes....in this case lower top speed.

i mean the car could be travelling at the 160km/h but the meter shows 150km/h.

Shan2nu...i remember a post where you had mentioned that the wheel size and the tire profile would affect the speed reading.

pankaj T

Speedo is not calibrated to Rim size its on the Tyres over all Diameter..If you keep that unchanged there wont be any error.

Boom Shiva · 29th May 2006, 15:01

From what I've heard, upgrading from 12" to 13" will slightly decrease your acceleration, but should actually increase your top speed marginally, because now your car is covering a slightly larger area with every turn of the wheels.

5u3zEr0 · 29th May 2006, 18:49

This happened to me too when I changed from 145/70 r 13 to 165/65 r 13 instead of 165/60 r 13 which is the right upsize for my ex-Zen. I was not able to cross 140 kmph and then it struck me thats it because the OD of the tyres has increased.

Samrat Banerjee · 12th June 2006, 12:02

Quote:

Originally Posted by amitoj

also theoretically speaking, 155 over 145 means ur tires will have more surface area contact with the road.... which means more friction... which means some power from the engine will go into overcoming that friction. U were not using alloys before so when u switched to alloys, the reduction in weight would have helped. But was it enough?

Hi,
I am planning to upgrade my Baleno from the 165/80 R13 to 205/60 R14 with alloys. Wanted to know what would be the drop in engine power?
Thanks,

kpzen · 12th June 2006, 15:04

Quote:

Originally Posted by Samrat Banerjee

Hi,
I am planning to upgrade my Baleno from the 165/80 R13 to 205/60 R14 with alloys. Wanted to know what would be the drop in engine power?
Thanks,

Its better to stick to 195/60-14.....

KP

sleepy · 12th June 2006, 17:06

i've upgraded to 195/55ZR15 and the max speed that i could manage was 165kmph on the swift. didnt really try top speed on stock tires. they should be similar i guess.

Buffetfan · 16th June 2006, 02:25

Quote:

Originally Posted by Samrat Banerjee

Hi,
I am planning to upgrade my Baleno from the 165/80 R13 to 205/60 R14 with alloys. Wanted to know what would be the drop in engine power?
Thanks,

Forget the mileage...you will KILL the pickup with such a huge size... I suggest 185/65 r 14 Good year eagle NCT 5 as the idea upsize for mileage/safety and comfort with good performance

sleepy · 16th June 2006, 22:04

i like my Goodyear F1 Eagle GSD3's! pretty good, still new though

29th May 2006, 15:01	#17
Boom Shiva BANNED Join Date: Feb 2005 Location: Mumbai Posts: 1,055 Thanked: 18 Times	From what I've heard, upgrading from 12" to 13" will slightly decrease your acceleration, but should actually increase your top speed marginally, because now your car is covering a slightly larger area with every turn of the wheels.
	() Thanks

29th May 2006, 18:49	#18
5u3zEr0 BHPian Join Date: May 2005 Location: Madras Posts: 379 Thanked: 3 Times	This happened to me too when I changed from 145/70 r 13 to 165/65 r 13 instead of 165/60 r 13 which is the right upsize for my ex-Zen. I was not able to cross 140 kmph and then it struck me thats it because the OD of the tyres has increased.
	() Thanks

12th June 2006, 17:06	#21
sleepy BHPian Join Date: Apr 2006 Location: chennai Posts: 41 Thanked: 0 Times	i've upgraded to 195/55ZR15 and the max speed that i could manage was 165kmph on the swift. didnt really try top speed on stock tires. they should be similar i guess.
	() Thanks

16th June 2006, 22:04	#23
sleepy BHPian Join Date: Apr 2006 Location: chennai Posts: 41 Thanked: 0 Times	i like my Goodyear F1 Eagle GSD3's! pretty good, still new though
	() Thanks