185/65-R15 on xB?
Senior Member
Music City Scions
SL Member
Joined: May 2004
Posts: 11,808
From: West TN - Land of twisty roads
Originally Posted by BozzMan
i also plan on running 185/65/15 on my xA with TRD springs this winter. i hope they won't rub!
So What are the benefits of running 65 series or using a tire calculator with the 65 series in the equation.
I mean after 100k miles would a 65 series have helped to lower the total mielage considerably as well as running lower engine rpm thus increasing engine life????
Thanks
I mean after 100k miles would a 65 series have helped to lower the total mielage considerably as well as running lower engine rpm thus increasing engine life????
Thanks
Admin Emeritus
SL Member
Joined: Jan 2005
Posts: 14,570
From: University Place, WA
Benefits are a slightly better ride and a broader choice of tires.
Speedo will be more accurate at highway speeds than with OEM tires.
With 185/65R15 tires, at 100,000 miles indicated on the odometer you will likely have gone approximately 106,100 actual miles.
Engine revoutions over 100,000 miles will be reduced (approximately 16,900,000,000 total revolutions as opposed to 18,000,000,000 assuming a constant 60MPH), but those revolutions will be at a slightly larger stress level do the reduced leverage advantage because of the lower effective numerical final drive ratio.
I suspect the overall 'stress' on the engine and drivetrain will be similar with either tire, and will be much more dependent on driving style, road surfaces, fuel quality, total payload, outside temperature, lubricant quality, number of gear shifts, average overall speed, etc., than any minor change due to a 0.4" larger tire...
:D
Speedo will be more accurate at highway speeds than with OEM tires.
With 185/65R15 tires, at 100,000 miles indicated on the odometer you will likely have gone approximately 106,100 actual miles.
Engine revoutions over 100,000 miles will be reduced (approximately 16,900,000,000 total revolutions as opposed to 18,000,000,000 assuming a constant 60MPH), but those revolutions will be at a slightly larger stress level do the reduced leverage advantage because of the lower effective numerical final drive ratio.
I suspect the overall 'stress' on the engine and drivetrain will be similar with either tire, and will be much more dependent on driving style, road surfaces, fuel quality, total payload, outside temperature, lubricant quality, number of gear shifts, average overall speed, etc., than any minor change due to a 0.4" larger tire...
:D
