Just curious, what does the "J" in wheel size 18x8J stand for? Also I have new wheels that are 18x9 (no "J"). Would that extra inch have any effect on the tires? Thanks.

eddie

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2008 Silver Sky Metallic, DC, 5.7, 4x4 – tow package – Garage Pro nerf bars – Mamba 18” wheels – Stubby antenna – Eclipse AVN 5500 NAV with Sirius satellite radio, DVD, CD & MP3 – BedRug bedliner – Truxedo Lo Pro tonneau cover

The only "J" on a tire that I know of would be the speed rating. And if that is the case, then you don't want those tires. A "J" speed rating is for 62 mph.

Maybe this will help:
Tire code - Wikipedia, the free encyclopedia

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI
All mod descriptions and pictures © 2007,2008 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

Thanks Tox, but I was referring to the wheels not the tires. See attachment concerning Tundra Tires and wheels.

eddie

Attached Images

2007_Tundra_ tire_&_wheel_fitment.pdf (131.9 KB, 12 views)

It has to with the rim contour.

Car Bibles : The Wheel and Tyre Bible Page 2 of 2

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Reading that made my head hurt.

Wow, that is a lot of tire and wheel information. I'll never have to ask about what the letters and numbers mean again. Thanks.

Great information but whers the tylenol.

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If you consider cars sacred objects, and find yourself treating them with adoring reverence, while others consider your enthusiasm to be fanatically extreme, then you are a certified car nut….like me !!!!


2007 Tundra DC 5.7 4X4 with very fast Radiant Red slapped on.
Custom painted engine cover(Godzilla)
One set chrome mannly truck nutz.
Putco chrome tow mirror covers and tail gate handle.
Replaced door handles with chrome.
Raptor oval nerf bars.
18X9 Ultra Goliaith wheels +25 offset, chrome.
Truxx 3/1 Level, 1in Differential Drop.
35X12.50-18 Nitto Mudd grapplers. Inflatted 35.04 H and 12.20 W.
15% tint fronts.
American Aluminum low profile tool box, carpeted.