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wheel or tire traps
Posted: Tue Sep 12, 2006 8:20 pm
by usa1911a1
I was bothered by Blake's injury and needed to know more about tire traps. The web site below has some good information for anyone who does not have a good working knowledge of this phenomenon.
http://www.msgroup.org/forums/mtt/topic.asp?TOPIC_ID=135
Capt. Bob in CT.
[Non-text portions of this message have been removed]
wheel or tire traps
Posted: Tue Sep 12, 2006 8:30 pm
by teamster1997
Railroad tracks are a great example. The wet one's are really bad.
Tim.............
wheel or tire traps
Posted: Tue Sep 12, 2006 9:09 pm
by Jeff Saline
On Tue, 12 Sep 2006 21:09:00 -0400 "usa1911a1"
writes:
> I was bothered by Blake's injury and needed to know more about tire
> traps. The web site below has some good information for anyone who
> does not have a good working knowledge of this phenomenon.
>
>
http://www.msgroup.org/forums/mtt/topic.asp?TOPIC_ID=135
>
>
> Capt. Bob in CT.
<><><><><>
<><><><><>
Capt. Bob,
Thanks for sharing that safety tip. Seems like I already knew it but it
was a good refresher. In 1979 I rode over a 2" angle iron about 5 feet
long doing maybe 50 mph. Stuff I learned about riding over objects sure
saved me and my passenger. After the jolt she asked what that was all
about. I was lucky it was only at a slight angle and the open portion
was facing me. My front tire flipped it and the rear had to ride over
the edge.
I was talking with a Motorcycle Safety Foundation Instructor (ride coach
or whatever) on Sunday. He said he had an experienced riders course
coming up with 23 open slots and couldn't get it filled. I told him I
take it for free every couple of years. He commented on how he'd like to
take it with each of his bikes just for the experience of doing the
skills portion on each bike. Then he commented on how all the folks at
the riding club meeting could probably teach the course. I told him how
I've learned something at every course I've taken since my first one in
1979 taught by the Maryland State Motormen (Highway Patrol). Refreshers
are always good.
Thanks again and best,
Jeff
Jeff Saline
ABC # 4412 South Dakota Airmarshal
Airheads Beemer Club
www.airheads.org
The Beautiful Black Hills of South Dakota
75 R90/6, 03 KLR650, 79 R100RT
wheel or tire traps
Posted: Tue Sep 12, 2006 9:21 pm
by Jim
Thank Capt. Bob.
I experiened this:
It is not so much that you should fear that your front tire will fail
to get over the trap, it is that you must be concerned about getting
your rear tire over it. What happens if your attack angle is low is
that you instinctively turn your front wheel into the trap to get over
it, so it does, but your rear tire, having a lower attack angle,
slides along the trap rather than going over it. This immediately
twists your bike into the turn and presents an ever increasing attack
angle for that rear tire. At some point (quickly) the attack angle
will be sufficient and the rear tire will grab and ride over the
obstacle. Unfortunately, while it was sliding along you and your bike
turned the front wheel in the direction of the slide. Thus, when that
rear tire grabs it is analogous to the classic conditions of a
highside. About 2/3s of a second later you will hit the ground.
Or go over the side as the case may be.
Check out these pixs.......
http://xs106.xs.to/xs106/06373/crash2.jpg
http://xs106.xs.to/xs106/06373/crash1.jpg
--Jim
A-15
> I was bothered by Blake's injury and needed to know more about tire
traps. The web site below has some good information for anyone who
does not have a good working knowledge of this phenomenon.
wheel or tire traps
Posted: Wed Sep 13, 2006 7:53 am
by Chris Norloff
I find that information rather suspect myself.
from the website:
"A mere one inch of height is sufficient to stop you cold - your bike will fall over before you can turn the wheel.
In this particular case you have no choice but to stop completely, lean the bike away from the trap, and walk the bike free. "
A one-inch raised edge can bring down a motorcycle? What do all the off-road riders do when confronted with obstacles and edge traps more than one-inch tall?
Yes, edge traps can be a problem, but I don't believe they're that severe at one-inch tall, and if you steer with your feet you can get out of them fairly easily.
Chris
P.S. This is not to disparage Blake, I know how easy it is to get caught. On my TAT ride I managed to fall over in about two inches of water at a ford.
---------- Original Message ----------------------------------
From: "usa1911a1"
Date: Tue, 12 Sep 2006 21:09:00 -0400
klrsos emergency road assistance group
Posted: Mon Sep 18, 2006 2:32 pm
by David Stone
Hope this is not frowned on... if so, just let me know. Im a trainable
monkey

I'm the owner of
http://autos.groups.yahoo.com/group/klrsos/. We are a
non-commercial group of KLR riders and our group is mainly focused on
the maintenance of a reliable, validated, actively maintained and
moderately secured emergency contact listing. I've seen a similar DB
on this site... I don't know how useful of well maintained it is...???
If you're willing to have your personal contact information posted in
a moderated Yahoo Group, please take a look at KLRSOS and join with
our 40+ international riders that are willing to offer emergency
assistance to KLR trippers.
You guys have a very active and helpfull group here. Thanks for all of
your hard work and information!
Regards,
David