Your view on dropping down a tire size to 245’s

[Wennfred]

Thinking about dropping the width from 255 to 245 to gain more efficiency and have less weight. Those 255’s are massive.What’s your take on this.

Fred

 

[WarpedOne]

You try it out and report
Original 9.5" rims should have no problem wearing 245 tires but there would be more gain with some new 9" rims.
Tire Width for a Wheel/Rim Size Chart

 

[Wennfred]

You try it out and report
Original 9.5" rims should have no problem wearing 245 tires but there would be more gain with some new 9" rims.
Tire Width for a Wheel/Rim Size Chart

That’s great thanks, my custom wheels are stock 9.5” so I thing 245 will be good to go. Will report back at 45,000 miles when it’s time to replace them.

Fred

 

[Barrygold]

245/40R 20 will be 4mm shorter in diameter and cause 1% Speedo error.

You may have to bump up to 245/45R20

 

[Wennfred]

View attachment 569255 245/40R 20 will be 4mm shorter in diameter and cause 1% Speedo error.

You may have to bump up to 245/45R20

Mine are 19”

Fred

 

[Barrygold]

Mine are 19”

Fred

Same results with 19s. You’d be -4.5mm difference in diameter and have 4.5mm more wheel gap. Plug the tires in this calculator

https://www.willtheyfit.com/index.p...2=45&wheel_size=19&wheel_width=9-5&offset2=20

 

[LevelHeaded]

I like the stock width and am averaging under 240 wh/mi so I think I’m fine with it...