http://faq.ninja250.org/wiki/Can_I_p...on_the_rear%3F
Some info as to why (rather why not) on both parts.
I believe in an absolute last resort position.. A rear in front or a front in the rear is acceptable, but for regular use.. not so much! If you Google it, there are a few who accept the rear in the front, but not many who accept the front in the rear!
EDIT: Here is some more information from Metzeler:
http://www.metzelermoto.com/web/prod...default.page#8
See statement 20.
And some more from Avon:
Quote:
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Originally Posted by Avon
Tires Directional Arrows Explained By Avon Tyres
Published by Cyril Huze August 23rd, 2009 in Builders, Editorial and Wheels.
Before we can talk about directional arrows you must first understand a bit about tread patterns.
There are many different tread patterns but there is one main reason to have any tread and that
is to disperse water. (dust, dirt)
A tread pattern can be designed to disperse more water by making it rotate in only one direction.
Thus, the need for directional arrows. The arrow tells you which way to mount a tire for maximum
water dispersal. Another, less apparent reason for directional arrows is the tread splice.
What is a tread splice? When a tire is manufactured the tread portion of the tire starts out as
a long flat strip. This strip is wrapped around the tire and the two ends are cut on an angle
so one end overlaps the other rather than having square cut ends.
This overlapping point or splice offers a bigger surface area to bond together, rather than the
small surface area provided by square cut ends. (Imagine gluing your fingertips together, as
opposed to gluing along the entire length of your fingers laid on top of each other. Like an
angled splice, the overlapping fingers result in a much stronger bond).
To further ensure the strength of this bond along the tread splice the directional arrow will show
you which way to mount the tire so that when the rider is “on the gas”; the acceleration force on
the rear tire is pressing the splice together, rather than peeling it back.
As for braking, 80 % of the braking should take place in the front on most bikes. Therefore, the
front tread splice is run in the opposite direction than that of the rear, so when the rider is on
the brakes, he’s not peeling the tread splice back.
If you are using a tire that has a directional arrow for rear rotation only and for some reason you
want to put it on the front, make sure it is rotating in the opposite direction so you don’t
aggravate the tread splice.
Avon Tyres.
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