[Vintage-race] Trailer tires

[Carl McLelland]

John,
I've got Goodyear radial (trailer) tires on my enclosed car trailer. I've
weighed it on certified scales (when loaded) and I'm about 5,200 pounds.
(7,000 gross weight rating). I've experienced this with the tires beginning at
about 3 years of age. I've noted the lifting (delamination) of the center of
the tread, and also noted splitting of the sidewall near the edge of the tread
coinciding with the delamination. My tire guys scientific explaination is....
"Yup, day'll do dat".

Of interest I have bias ply tires on the boat trailer (8,000 pounds when
loaded) and have never experienced this problem with that trailer. While the
majority of the boat trips are to nearly Pyramid Lake (70 mile round trip),
we've also made numerous trips to Lake Powell (1,700 mile round trip) so both
trailer have been subjected to long trips with the tires getting fully heated.

My tire guy also recommended bias ply tires for the car trailer next time I
need skins for it.. Haven't decided if I'll go bias on the car trailer or
Michelins, and not worry about it.
    Carl        Lotus 61 FF
  ----- Original Message -----
  From: John.Desantis at Inficon.com
  To: vintage-race at autox.team.net
  Sent: Thursday, October 02, 2008 5:08 AM
  Subject: [Vintage-race] Trailer tires


          Two friends of mine have recently had multiple trailer tire
  failures (tread pealing off) while on trips.  When purchasing replacement
  tires, friend #2 was told that trailer tires delaminate in about 4 years.
  The tire seller also mentioned that it was easy to determine when the
  tires were near failure.  He mentioned that the center section of the
  tread raises up.  So I go home and check out my 4 year old ST205/75-15's
  and they are very distinctly raised in the center, approximately 1/4 inch.
   When I checked the spare that is the same age as the tires on the
  trailer- it looked normal.  I am planning to buy 4 new tires come spring.

          Reading anything I could find on the web about trailer tires I
  found the it is highly recommended to replace them every
  4 year.  I also found info on tread delamination, I could not find any
  thing mentioned about the tread raising up.

          Has anyone out there had similar experience with raised tread?


  John DeSantis
  Inficon
  Phone 315-434-1196
  Fax 315-434-9908
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