"Tread" is overrated... "tread" is overrated... "tread" is overrated...
We ain't talking those big, fat, wide , "swamper" type tires that guys stick on their 4×4 toys... we're talkin' tires for workin' trucks. If ya' go back and look at the tires I'm running, the "tread" is nothing more than a couple squiggly lines through the center... intended to give water a place to go so ya' don't hydroplane on the road. When under load or pullin' hard, causing the sidewalls of those types of bias tires to flex, it pulls the center "tread"
away from the surface and forces the outer "lugs"
down into the surface, that's how they get traction. When not under load, and up to road pressures, those side lugs don't even make contact with with a hard, smooth surface like pavement (or only lightly do). That's why you lower pressures as conditions get nasty... so the sidewalls flex a bit more and force the tire to pull the center "tread" up and use the outer side lugs. Radials maintain, or even increase the contact patch when sidewalls flex, they ride on top and depend on a larger overall contact area allowing you to maintain speed ('cause you're on top). You can't use those wide-open, soft(er) rubber, paddle-like side lugs on a radial intended for running down the paved road... 'cause they're always in contact and would wear out before you got home. (Like I said, we ain't talkin' "Swampers") Radials use "tread" to try and get traction in all conditions, bias only use the smooth "tread" area for running down the road... reserving the side lugs for only when needed. When my truck is sitting on pavement you can slide a quarter under the side lugs... try that with a radial.
Most of the comments I'm reading here comes from "radial" thinking... ya' flat gotta' forget how ya' drive a radial to understand.
Some other comments are coming from what guys remember about those bias street tires from the 50's and 60's... those tires are gone, forget 'em (except for some specialty tires).
The bias tire I'm talkin' about, tires for workin' trucks, are "special purpose" tires, they are designed for maximum traction under the worst conditions and loadings... they ain't designed for your street truck, or for off-road toys so ya' can fly over the rough and wet ground, climb rocks, and "float" over mud puddles... they're specifically designed to get down 'n' dirty, pulling, hauling, and crawling through the muck and slop. They tough, near indestructable... ya' ain't gonna' poke a stick through the sidewall. And if ya' spin 'em, and one of those side lugs hooks something solid... well... you're likely to break something on the truck before ya' hurt the tire. The lugs are self-cleaning because they're on the outer edge and the bottom is rounded, they literally "squirt" the crap out the sides... you can even sometimes see it come squirting out while sitting in the cab... every revolution puts "new" earth in contact with the tire no matter how sloppy, mucky or sticky it may be. They do "cut" to the bottom for that very reason... 'cause they're narrow and force the crap out the sides rather than ride up over the top. But ya' ain't gonna' run 30-40 MPH through crap like ya' do with a radial... you flat haf'ta slow down and "work" through it. But when the crap gets deep, and your radials leave your axles laying on top, wheels spinning in mid-air... these tires will still be digging and dragging the axles and truck through the crap, slowly but surely they catch up to ya', and drive around ya' hung-up azz.
It is flat impossible to make a radial work that way... and no "wide" swamper type can either (bias or not).
Just read the posts from guys in this thread that have
actually run those narrow, traction-lug bias tires... they're saying the same thing I am.
Heck,
philoshop even described it as boring
tunnels through snow drifts.
I've run both types of tires, I still run both types of tires... yet, you guys that have never run the tires I'm talkin' about know more about them than me?? That's just crazy. It ain't just about the "wide" or "narrow", and certainly ain't about the "tread"... it's the whole damn package, it's the difference in how they work as a package. Ya' flat haf'ta forget about how ya' drive a radial before you'll ever catch on.
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