J Burns wrote:
On 5/10/15 2:16 PM, micky wrote:
On Sun, 10 May 2015 12:48:50 -0400, Retired wrote:

On 5/10/15 1:45 AM, micky wrote:
OT I ended up with a pair of tires that only go in one
direction. I
want to learn about these things but I don't know what they are called.
What are they called.


Read Tire Racks's explanation of directional tires he

http://www.tirerack.com/tires/tirete...jsp?techid=188

Thanks. I opened this, and I'll read it today.

Directional. I think I can remember that. Thanks everyone.

On their track, engineered like most roads, backward tires performed
fine. That was my experience on motorcycles. I'd run at 80 or 90 in
hard rain.

Ice was more interesting, but the coefficient of friction for tires is
about .15, so it was okay. Wet ice was trickier, with a CF of about .05.
Still, riding was safer than walking because my tires held better than
my hiking boots. I just had to remember I wasn't on dry asphalt.

One morning on a deserted interstate in heavy rain, I hit the low point
between two hills. I guess that's a saddle. I felt something new to me.
It felt like a CF of 0. I guess the road was flooded deep enough that
the rubber wasn't reaching the road.

I was afraid that if my tires started to slide from under me and they
suddenly got a good bite on the pavement at the other side, I'd be
slammed on my head. Riding a bike, I'd never paid attention to balance.
I did now. I sat very carefully and used my knees and hands to try to
hold the machine perfectly upright.

I'll bet invisible flooding like that is what causes most hydroplaning.
I guess directional tires can handle slightly deeper flooding if they
are mounted frontwards.

I believe hydroplaning occurs when surface has water, does not have to
be puddle(deep flooded water). Once I was heading down on a local
freeway doing 100kph in the rain when another guy merged in front of me
at very high speed, suddenly his car flew across median and speeding up
opposite direction perfectly and then caame to a stop slowly. He must
have realized how lucky he was and know by now hydroplaning.