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What is the "J" in wheel size?

This is a discussion on What is the "J" in wheel size? within the Wheels, Tires and Brakes forums, Tweet Just curious, what does the "J" in wheel size 18x8J stand for? Also I have new wheels that are ...

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    JerseyBiker's Avatar
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    What is the "J" in wheel size?



    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

    2008 Silver Sky Metallic, DC, 5.7, 4x4 – tow package – Garage Pro nerf bars – Mamba 18” wheels – Nitto Terra Grappler tires – Pioneer AVH-P4300DVD entertainment system – Stubby antenna – BedRug bedliner – Truxedo Lo Pro tonneau cover


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    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, 3M clear bra, 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, CDT 6.5" speakers, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Nitto Terra Grapplers LT305/55/20, OME HD coilover lift, Firestone helper air bags, 55w reverse lights, stereo cable lock, Tekonsha P3 brake controller, colormatched exterior parts (de-chromed truck), Weathertech floor mats, eDead sound proofing, CDT Audio speakers, Custom made speaker brackets, LED foot well lights, PRG/Deaver 3 leaf mini-pack, LED map lights, Air Lift WirelessAir system, Bed LED Lights
    All mod descriptions and pictures © 2007-2014 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

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    Quote Originally Posted by Toxarch View Post
    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.
    Thanks Tox, but I was referring to the wheels not the tires. See attachment concerning Tundra Tires and wheels.

    eddie
    Attached Files Attached Files

    2008 Silver Sky Metallic, DC, 5.7, 4x4 – tow package – Garage Pro nerf bars – Mamba 18” wheels – Nitto Terra Grappler tires – Pioneer AVH-P4300DVD entertainment system – Stubby antenna – BedRug bedliner – Truxedo Lo Pro tonneau cover

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    Toxarch's Avatar
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    Reading that made my head hurt.
    Any questions about truck mods I have done need to be asked in the forums. Don't send me a private message about mods cause I probably won't answer that PM unless there is money involved.

    2007 SR5 Crewmax 5.7L 4x4
    Mods: nerf bars, Truxedo tonneau, radar detector power, 3M clear bra, 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, CDT 6.5" speakers, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Nitto Terra Grapplers LT305/55/20, OME HD coilover lift, Firestone helper air bags, 55w reverse lights, stereo cable lock, Tekonsha P3 brake controller, colormatched exterior parts (de-chromed truck), Weathertech floor mats, eDead sound proofing, CDT Audio speakers, Custom made speaker brackets, LED foot well lights, PRG/Deaver 3 leaf mini-pack, LED map lights, Air Lift WirelessAir system, Bed LED Lights
    All mod descriptions and pictures © 2007-2014 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

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    Quote Originally Posted by 07TexasTundra View Post
    It has to with the rim contour.
    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.

    2008 Silver Sky Metallic, DC, 5.7, 4x4 – tow package – Garage Pro nerf bars – Mamba 18” wheels – Nitto Terra Grappler tires – Pioneer AVH-P4300DVD entertainment system – Stubby antenna – BedRug bedliner – Truxedo Lo Pro tonneau cover

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    Great information but whers the tylenol.
    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.
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    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.
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    Cherry Bomb Single Split Dual Exhaust.


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