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Car Forum / Ford / Ford Cars / August 2008

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14 inch to 15 inch tire swap

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komobu - 23 Aug 2008 16:38 GMT
Hi;

I have a 96 Ranger that came with P235/70R14 tires . I came across a
set of rims and P215/65R15 tires that I put on the truck. Any idea
what I will have to do to get my speedometer accurate?

Thanks
Caesar Romano - 23 Aug 2008 17:17 GMT
>Hi;
>
[quoted text clipped - 3 lines]
>
>Thanks

According to

http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTireMath.jsp

the new tire P215/65R15 will have a circumfance approxamately 3" less
than the old tire. At 65mph on the speedometer you will therefor be
actually have a speed of approximately 63mph or about 3% less than the
indicated speed.

I don't know if there is any way to recalibrate the speedometer. Just
remember that you are actually moving 3% SLOWER than the indicated
speed and you will be ok.
Ted Mittelstaedt - 23 Aug 2008 18:07 GMT
> I don't know if there is any way to recalibrate the speedometer. Just
> remember that you are actually moving 3% SLOWER than the indicated
> speed and you will be ok.

And that the odometer will also be off.

Ted
Caesar Romano - 23 Aug 2008 20:34 GMT
>> I don't know if there is any way to recalibrate the speedometer. Just
>> remember that you are actually moving 3% SLOWER than the indicated
[quoted text clipped - 3 lines]
>
>Ted

True. I forgot about that. Thanks for the reminder.
Ted Mittelstaedt - 23 Aug 2008 18:06 GMT
> Hi;
>
> I have a 96 Ranger that came with P235/70R14 tires . I came across a
> set of rims and P215/65R15 tires that I put on the truck. Any idea
> what I will have to do to get my speedometer accurate?

If the speedo is a mechanical linkage then Ford sells different speedo
gears that you change out (at the cable end of the speedo, not the head end)

If it's electronic then the dealership can plug in a scantool and
reprogram the speedo pinion factor.

Ted
Jeff - 23 Aug 2008 18:52 GMT
> Hi;
>
[quoted text clipped - 3 lines]
>
> Thanks

When I go through an area where the police have set up on of those
RADAR detectors that reads the speed, I compare my speedometer with
the speed that the RADAR detectors report. Usually, the speed is
within 1 mph or so. You try something like this, too.
Caesar Romano - 23 Aug 2008 20:39 GMT
>> Hi;
>>
[quoted text clipped - 8 lines]
>the speed that the RADAR detectors report. Usually, the speed is
>within 1 mph or so. You try something like this, too.

Good idea, unless you are someone like my wife. Then you get a ticket.

Once I was the passenger when my wife got stopped for speeding. When
the cop came to the window and asked for her license, I said "Go
ahead, give her a ticket. She won't listen to me!". The cop started to
laugh and said "If I do that, you will be in more trouble than her".

He gave her the license back and told her to slow down.
Jeff - 23 Aug 2008 21:40 GMT
> >> Hi;
>
[quoted text clipped - 17 lines]
>
> He gave her the license back and told her to slow down.

The ones I am thinking about are the ones where they display the speed
you are going. Usually there is a sign that says something like speed
limit 25, you're going: and they display your speed. Obviously, to get
you to slow down.

Jeff
Bruce L. Bergman - 24 Aug 2008 01:53 GMT
>> >> Hi;
>>
[quoted text clipped - 22 lines]
>limit 25, you're going: and they display your speed. Obviously, to get
>you to slow down.

 Of course, those display radar signs or trailers also trip off all
the radar detectors as people drive by, which also gets the rowdies to
slow down.  

 And if the speeders get used to the trailers, all they have to do is
have the traffic cop on a motor hide BEHIND the trailer with a
different band gun.  The jokers ignore their radar detector and keep
flying up that road because they know about the trailer...

 --<< Bruce >>--
Jeff - 26 Aug 2008 17:21 GMT
On Aug 23, 8:53 pm, Bruce L. Bergman
<blnospamberg...@earthlink.invalid> wrote:

> >> >> Hi;
>
[quoted text clipped - 33 lines]
>
>   --<< Bruce >>--

The idea of many of these is not to give out tickets, but to let
people know their speed, so that they can modify their speed
appropriately. The officials in PA often put them at the entrances to
work areas, so that people can see that they're going too fast, and
they slow down appropriately.

Of course, there is nothing that prevents the police with RADAR guns
from stopping those who choose to ignore the warning.

Jeff
brian - 27 Aug 2008 00:50 GMT
"Jeff" <jeff.utz@gmail.com> wrote in message
The idea of many of these is not to give out tickets, but to let people know
their speed, so that they can modify their speed appropriately. The
officials in PA often put them at the entrances to work areas, so that
people can see that they're going too fast, and they >slow down
appropriately.

There shouldn't be any speed limits anywhere in the US, including even in
cities.  Common sense should dictate how fast one travels.  If speed causes
an accident, death or injury, then the driver can be cited appropriately.
Tom - 27 Aug 2008 09:02 GMT
the only problem with your way of thinking is, most people do not have any
common sense, or the brains to use common sense.

"brian" <brianm7@aol.spam.com> wrote in message
There shouldn't be any speed limits anywhere in the US, including even in
cities.  Common sense should dictate how fast one travels.  If speed causes
an accident, death or injury, then the driver can be cited appropriately.
Ted Mittelstaedt - 27 Aug 2008 11:34 GMT
> the only problem with your way of thinking is, most people do not have any
> common sense, or the brains to use common sense.
[quoted text clipped - 3 lines]
> cities.  Common sense should dictate how fast one travels.  If speed causes
> an accident, death or injury, then the driver can be cited appropriately.

It's really not even that at all.  There is precedent for this, though.

Many years ago Montana had NO daytime speed limit on it's Interstates,
you could drive as fast as your vehicle was able.

Anyway, the problem nowadays is that if a municipality posts "no speed
limit" or some such on a roadway, then if some joker comes flying around
the corner and goes off the road and kills himself, his survivors are going
to
sue the municipality claiming that they liable since they did not provide an
appropriate speed limit.

The real issue is that of enforcement.  NOT posted speeds.  There is no
reason that a speed limit can't be posted.  However, when a cop pulls
a driver over for speeding, they should NOT feel compelled to write a
ticket.  Unfortunately, in most police departments the cops who don't
write a lot of traffic tickets are viewed as being slackers and not doing
their jobs.  So even if a cop really doesen't want to write a ticket, most
times he is going to write one.  And in small municipalities their city
budget is utterly dependent on the ticket revenue.

For example in OR, there's a town named Colby I think that is on I-5
that get's 1/3 of it's town revenue from tickets.  At one point it was
1/2 of it's budget - to the point that the OR legislature passed a law
prohibiting towns along interstates from getting ticket revenue if the
interstate wasn't in city limits - Colby then took advantage of a loophole
in the law and annexed something like a mile of freeway.  There's been
further attempts in the legislature to correct this but nothing has come
of it yet.

The ideal situation is that the cop's job performance should not be
dependent on how many tickets he writes, unfortunately not a lot
of police departments are setup this way.

In my town, PDX, the local police department every week picks
a different busy intersection in the city and stings it - they sit there
with 5-6 cop cars just writing tickets for the damdest little things,
to every car that comes though.  You fail to signal, you get a
ticket, you lane change too soon after turning you get a ticket,
etc. etc.  One time I remember they took a freeway exit
from I-5 that went into a trucking industrial area, and had a stop
sign on it, and for a period of 3 weeks, replaced the sign with
overhead traffic lights, and wrote an ungodly number of failure
to stop at red light tickets, then took down the traffic light and
replaced the stop sign.  It costs about $80K to put in overhead
traffic lights in an intersection.

Then every 6 months the cops do a public relations
push claiming they need more money to pay for more officers
to do gang-enforcement policing and such, and that city residents
should write to the mayor demanding more money be put to
the police department.  And then they complain when nobody
writes in.  There's a cause and effect here that's obvious to
everyone in the city except for the cops and (apparently) the
chief of police.

In my opinion the only real solution is for a city to separate
the job of traffic enforcement from the police dept.  The police
dept. should be solving murders, theft, muggings, etc.  A separate
bureau in the city should be handling traffic enforcement and
writing tickets - the same bureau that currently writes parking
tickets.   And instead of just collecting the fine they should be
running the drivers through traffic school to try to teach them
better behaviors.

We have all read plenty of stories of cops writing tickets by the
side of the road and getting side-swiped and put into the
hospital.  Well, think of how expensive it is for a city to put a
fully certified cop on the beat, then pay for his disability for
the next 20 years as a result of a fuckup like this. We also
have to outfit cops with high-powered cars so they can
chase down bank robbers and suchlike.  It's only natural
that their instinct is to stomp on the gas and go roaring down
through a residential area if they see a speeder.

It would be far better for a meter maid driving some el-cheapo
Honda Accord that isn't in cop-car colors, and who sees a speeder
to simply radar them, record the plate number then feed it into a
city computer that can take a look at the drivers past record,
the weather conditions, the road conditions, road location, type
of car, amount of speed, and so on and just make a judgement on
whether to issue a ticket or not.  Like if the car is a sedan going
40 in a 35 zone in sunny weather on a main arterial, then don't
issue the ticket - OTOH if the car is a sports car and the driver
has had 2 other tickets, then issue the ticket.  Since the meter maid
doesen't pursue, they are also unlikely to be pulling people over in
unsafe locations.

Ted
Kenneth Zinger - 28 Aug 2008 02:50 GMT
"Tom" <tjctransport@optonline.net> wrote in > the only problem with your way
of thinking is, most people do not have any common sense, or the brains to
use common sense.

in other words, you believe what your police state tells you to believe and
think what they want you to think.  You're saying that Americans don't have
any common sense, but people that live in countries with no speed limits do
have common sense.  I just came back from a country that has no speed limits
and didn't see any burning wreckage blocking the freeway during the time I
was there.
Tom - 28 Aug 2008 23:45 GMT
that is not what i said at all. i said most people do not have common sense,
or the brains to use common sense.

did you see anyone in this "other country" driving 90 mph, weaving in and
out of traffic that is doing 30 mph, while eating a sandwich, drinking a cup
of coffee, talking on the cell phone, and reading the newspaper, while
steering with their knees???
i bet not, cause they have common sense. the idiots on the american roads
don't.

> "Tom" <tjctransport@optonline.net> wrote in > the only problem with your
> way
[quoted text clipped - 11 lines]
> and didn't see any burning wreckage blocking the freeway during the time I
> was there.
alabamarosethorn@yahoo.com - 24 Aug 2008 02:07 GMT
> He gave her the license back and told her to slow down.

Nice fiction.  Last time I heard about a female getting off with a
warning, the cop face-piped her and made her gobble the goo.
Alan B. Mac Farlane - 24 Aug 2008 11:14 GMT
in article
27485ee3-6a29-4dd8-a86d-6791e6f01f2b@y21g2000hsf.googlegroups.com, komobu at
curranpg@gmail.com wrote on 8/23/08 8:38 AM:

> Hi;
>
[quoted text clipped - 3 lines]
>
> Thanks

calibrate it to radar ... see how much you have to adjust your pedal in
regards to the readout on the speedo ... likely just 1 or 2 mph off one way
or the other.
 
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