On Wed, 3 Feb 2010 07:48:26 -0800 (PST), "
wrote:

On Feb 2, 7:15Â*pm, wrote:
. Anytime you try to put the tread contact ahead of the pivot
you are creating an unstable arrangement that simply won't work.

Not a completely true statement. Have you ever used a measuring
wheel?
===================
Leon
Virtually every distance measuring wheel available on the market
today has the pivot point well ahead of the patch.

The lufkin PSMW38 does. Northern's rotatape does. So does every other
RolaTape listed. DriVall Fencing's units do. The DuraWheel does. So
does the TruMeter. So does the Gill.
And EVERY measuring wheel I've ever seen, unless you DRAG it instead
of pushing it. And dragging is not accurate because you unload the
wheel, rather than loading it, over obstructions.