Toyota Tundra Forum

Tire Components & Construction.

Thought you guys may be interested what a tires looks like inside.

I also thought I would take advantage of this picture to talk about rim width and how it affects the bead and sidewall of a tire.

I marked the left side bead where it meets the rim. Notice how the two mate.
Now try to picture how those two would fit together with a wider tire.
With the wider tire the bead may not fit the angle of the rim. This improper fit will change the angles and internal stresses of the sidewall and how it flexes, heat build up and contact patch.






Bill

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2008 SILVER CREWMAX

• 5.7 LITER
• PIAA 540 X-treme White Driving Lighting System

Would you happen to know much about internal bead locks? Would that help when you put a wider tire on a narrower rim? Like putting a 325 or a 305 on an 8" rim which seems to be fairly common on the new Tundra.

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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, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Cooper Zeon LTZ 275/60/20 tires, OME HD coilover lift, Firestone helper air bags, 55w reverse lights, stereo cable lock, Tekonsha P3 brake controller, colormatched exterior parts (de-chromed truck), eDead sound proofing, CDT Audio speakers, Custom made speaker brackets, Weathertech floor mats
All mod descriptions and pictures © 2007-2009 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

no wonder it was soo hard getting that old tire off the rim I ended up using for a hose reel, that dang bead!

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You can never get enough of what you don't need to make you happy.

Tox I don't think bead locks would help much.
The problem is when you pull those beads together.
It bows the tread, changes how the belt package ride/sits.

I think everyone is wondering. What if I'm only outside the spec by a little.
For example, 305/65R18 tires require a min 8.5" rim. Will a 8.0 rim work. Technically - no. but it may work for you depending on a lot of variable such as tire pressure, load, heat, steering torque.

You most likely won't have catastrophic tire failure, but you may have irregular tread wear, sidewall stress cracks or splits, resulting in removing the tire from service prematurely.

Nice lesson Bill.... thanks!

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2007 Tundra Limited Double Cab 4x4 Super White
Volant CAI
Pioneer AVIC Z-2 (hard drive upgrade to AVIC Z-3)
Key FOB Tailgate Lock (courtesy of Toxarch)
OEM back-up camera w/flip down monitor microswitch mod
Sirius Satellite Radio
WeatherTech Floor Liners
20" OEM alloy wheels
Line-X Bed liner
UWS Black Powdercoat Low Profile Toolbox
DU-HA underseat storage unit
JC Whitney Black Nerf Bars
Lund Interceptor II Bug Shield
Tekonsha Voyager Brake Controller

Don't pop my bubble!!!! lol

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2008 Tundra CrewMax 5.7 4X4
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Mods- Homelink Mirror, Expedition One front and rear winch bumpers, PIAA 510 Ion fogs, Backup Camera, Lund Interceptor Bug Shield, Truxxx 3/1 leveling kit, 20% front window tint, 18x9 XD Monsters +18 offset, 325/60 R18 Mickey Thompson Baja ATZ's, DiamondDeluxe 3Hole Dogbox, Bushwacker Fender Flares, Custom Front Emblem, Weathertech front and rear liners, Husky center hump liner, N-Fab textured step bars