Tire diameter questions

[cfg83]

mcrews -

Originally Posted by mcrews

...

Warning: Increase in size increases wieght. I have been told that the static weight increase, say 8lbs is multiplied by 4 when rolling. This DRAMATICLY increases the demands on the brakes and associated parts like the rotor. So I would start with fresh rotors and pads.

Good luck!!

+1 . When I was doing research on my one-size-up from stock, I considered two-sizes-up from stock. For the tire I was looking at, this is what I saw :

OEM             = 185/65R15 = 17 lbs.
1-Up from stock = 195/65R15 = 18 lbs. =  5.9% heavier than OEM (my choice)
2-Up from stock = 205/65R15 = 21 lbs. = 23.5% heavier than OEM

CarloSW2

[moonmonkey]

cg did your tire change net a change in fe?

[cfg83]

moonmonkey -

Originally Posted by moonmonkey

cg did your tire change net a change in fe?

Yes, a +2% gain :

http://ecomodder.com/forum/showthrea...ires-2642.html

I use the GPS to calibrate the error of my odometer. I add my "2% bonus" in my fuel log. The mistake I made was not doing a GPS check *before* I did my tire change. That would have given me a before/after tire change odometer correction. However, the GPS after-results agreed with my predictions, so I am still happy with it.

In fact, I am way overdue for another GPS odometer check. I will put that on my todo list and report the results soonish.

CarloSW2