It depends on what the manufacturer was trying to communicate with a
little arrow. In some cases they specify the directiion of greatest
force, in others the direction of rotation. Since the manufacturer
can't know which tires are used in front or back, they provide an
arrow and then tell us (sometimes) what they mean.
On front tires the greatest force is clearly braking. On rear tires
it could be either, but with heavily biased braking and weight shift
it's probably engine.
As always, most of my experience is with Motorcycles, where the
braking forces on the rear tire are virtually nil, and the
manufacturers are very serious about thier little arrows. Even there
they have managed to confuse everyone by specifying rotation
directiion with most newer tires (where the front tire is decidedly
not a rear tire) and classic tires which generally could be either
and where the arrow specifies force.
On Jun 6, 2006, at 12:44 PM, <triumph_marx@freenet.de>
<triumph_marx@freenet.de> wrote:
> Pardon me for entering the discussion.
> Why should the tires be turned round for braking purpose?
>
> Every car has about 5000 HP or more braking power.
> Compared with acceleration power the tire woudn't notice a Triumph
> race car when beeing hard on the throttle.
>
> So turning round the tire would be dangerous, I assume!
> I am shure the tire plyes are designed for braking stress.
>
> Chris
>
>
> ----- Original Message -----
> From: "Bill Babcock" <BillB@bnj.com>
> To: "BOB KRAMER" <rkramer3@austin.rr.com>
> Cc: "Mike Kraemer" <kraemer@hoosiertire.com>; "FOT List"
> <fot@autox.team.net>
> Sent: Tuesday, June 06, 2006 9:24 PM
> Subject: Re: [FOT] directional Speedsters?
>
>
>> Depends on the reason for the direction. Some directional tires
>> (especially slicks or grooved DOT) have specified rotation for how
>> force is applied to the plies, and in that case you would want them
>> backwards on the front to suit braking force. In some cases they are
>> directional for guiding water, in which case you'd want them
>> forwards.
>>
>> As I recall, one of our august members was in touch with Hoosier, it
>> would be good to get the official word. Failing that, the look of the
>> tread pattern suggests rotation is for water and therefore should be
>> forward on the front.
>>
>> On Jun 5, 2006, at 9:04 PM, BOB KRAMER wrote:
>>
>>> I have a question about the Hoosier Speedsters. I notice that
>>> they are
>>> directional tires.
>>> On the old Yoke 008r's we used to run the 2 front tires backwards,
>>> opposite
>>> the arrows, and the rear with the arrows. Right or wrong I was told
>>> that was
>>> due to the hard braking we do. What is the recommendation for the
>>> Speedster
>>> tires.
>>>
>>> Bob Kramer
>
>
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