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Posted for David Jones <N295VV@aol.com>:

Mike Smith--

Thirty-five landings on McCreary tires is good.  You ask about switching to
Michelin or FCII--and you also ask about dimensions.

Yes, on my early IV there was a big problem with dimensions.  McCreary tires
cycled through the opening and past the Gear Door---barely.  We had to tweak
the openings quite a bit to give us a safety margin.

We determined that air pressure over 55 psi  would reduce the safety margin
for clearance, so this is a checklist item now.

Personally, if I consistently got 35 landings per tire, I would not want to
go through evaluating clearance criteria on other brands which may have a
different profile.

Getting a tire stuck coming out of a wheel well would make for a bad day.  If
it ain't broke, don't mess with it.

You might go through  a lot fooling around, only to find that the new brand
of tires didn't fit, or didn't give you more life.

A buck apiece per landing for tires that you know will come out of the well
is cheap...

David Jones

LML website:   http://www.olsusa.com/mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.