Schelling, Paul M wrote:
>
> Jeffrey Misner wrote:
>
> >Stock P235 75R15's = 28.8779527559.... inch diameter.
> >P245 60R16 = 27.5748031496... inch diameter
> >P245 50R16 = 25.6456692913... inch diameter
> >P245 65R16 = 28.5393700787... inch diameter
> >P265 60R16 = 28.5196850394... inch diameter
> >P275 60R16 = 28.9921259843... inch diameter
> >
> >If you _Really_ want a 50 series tire, you'd need a set of
> >P325 50R16 = 28.7952755906... inch diameter
>
> I see that Rob's truck is a 2WD, though, which means that stock is:
> Stock P215 75R15 = 27.7 inches
>
> The 235/70's he has now come out to 28.0 or 29.0 (I forget if they were
> on 15's or 16's).
>
> For stock height, he's now looking at a set of
> P295 50R16 = 27.6 inches or
> P245 60R16 = 27.6 inches.
>
> I wouldn't worry too much about matching the stock size exactly, though,
> because your speedometer is inaccurate anyway. Put your tires on, get
> out your stopwatch and your calculator, and figure out how fast you're
> really going when the speedo says 65.
>
> Later on, Russ wrote:
>
> >i believe a 245/50 would be your best bet for the height you are
> >looking for...but the truck will ride harder since you won't have
> >hardly any side wall.....
>
> True to a point. As y'all know, sidewall height is roughly the tire
> width times the aspect ratio: 245 x .50 = 123 mm = 4.82 inches. Stock
> is 215 x .75 = 161 mm = 6.34 inches. What this means to you and me is
*snip*
And to tak things ever further... Did you know that the BFG AT
tires are 'measured' from the middle of the tread depth??? (That's what
I was told)... My stock GY In..you know, didn't have any clearance
problems... My BFG AT 215/75-15 (same SIZE as the GY's) hit the frame
at full lock (the rub the little rubber 'mud' flaps)... My speedo was
off a bit when the tires where new too..(lower than actual speed as the
tires were 'taller' than a stock 215/75-15)... CARLSBAD Raceway took
care of that! :)
The same with motorcycle tires.. A pirelli MT21 (dual sport
knobbie tire) : I have a 120/90-18 rear, my friend has a 130/90-18...
120 mm wide, 90% of 120 high, 18" rim... My friend's tire SHOULD be
only
10mm wider... I measured, no problem for clearance on my bike... The
tire
is nearly 1" wider!! Pirelli measures (on MC tires at least) the width
on
the knobbies on the 120/90, but measure the width of the 130/90 by the
carcass of the tire!! Not the knobbies... Quite a big difference...
So, with all tires, you can use a 'rule' of thumb for measurement,
but when it comes down to individual brands you need to read the
specs...
The guys at Discount Tire where I bought my BFG's knew ahead of time
that
I would have 'clearance' problems because of the BFG's... But that it
wouldn't be bad (it isn't)... Talk to a tire 'eggspert' in your area..
"90/90-21 up front, and 120/90-18 in the rear....on my DR!"
Sam '95 SLT
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