[xj] Re: tires

@SDiegoHoms

Sorry to keep kicking an old tire, but have a few questions: One the regular
Kent rims (85 XJ6) can one go to the wider 60 series tires? Also someone
wrote about tire pressure being 30 or 31 aren’t you supposed to keep them at
the stated max 34-35 psi?
Thanks for your expertises,
Kurt in Sunny San Diego
85 XJ6 “Dover” 104,000 daily driver===================================================
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“DWYERD” <@Doug_Dwyer>

Kurt,
A six inch rim is not really wide enough to support most 60 series tires. A
215/60 may be OK, but much more than that should have a wider rim. In the
past I have used a 235/60 on a six-inch rim----sure, it’ll fit but the tire
just won’t “work” properly. I currently have 235/60’s on a seven-inch rim
and that’s a pretty good fit.

Tire pressure ? You’ll probably get 100 different answers. I usually run
about 3 psi below the max for day-to-day use. For highspeed highway work at
air 'em up to the max, FWIW.

Doug Dwyer
Longview, Washington USA

Sorry to keep kicking an old tire, but have a few questions: One the
regular
Kent rims (85 XJ6) can one go to the wider 60 series tires? Also someone
wrote about tire pressure being 30 or 31 aren’t you supposed to keep them
at----- Original Message -----
From: SDiegoHoms@aol.com
the stated max 34-35 psi?

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“Charlie” <@Charles_Nowlin>

Ah Yes!
Doug,
You are absolutely correct!

As a rule of thumb, the BEST ratio
of tire tread width, to rim width is one to one.
Or, as physically close as you can get to this ratio,
without exceeding by more than 1 %.

See:
http://www.tirerack.com/tires/index.html

Look at the tread width, and rim width in the illustration.
they are shown as equal.
Wider tires will tend to ride as if under inflated, wearing down the outer
edges.
So ! you say! Add more pressure! This will cause loss of the proper contact
patch,
add to hydroplaning, and skidding.

Tires that are narrower than the rim,
place excessive forces on the sidewall,
resulting in a heat buildup beyond tire design.

Yes, WIDER tires will mount, but you will be exceeding the:
handling capabilities,
contact patch,
hydroplaning, traction, and braking properties.
it will also add, undue stresses to the suspension of the vehicle.

All this, will lead to:
poor tread life,
poor handling characteristics,
poor wet weather performance,
premature suspension wear,
and …(hopefully not)
loss of control in an evasive maneuver.

Whew!
Charlie
Lumps Admin.
Matawan, New Jersey, USA
83 XJ6 350 Vette eng TH700R4*************************
----- Original Message -----
From: “DWYERD” DWYERD@email.msn.com
To: xj@jag-lovers.org
Sent: Wednesday, June 07, 2000 8:52 PM
Subject: Re: [xj] Re: tires

“DWYERD” DWYERD@email.msn.com

Kurt,
A six inch rim is not really wide enough to support most 60 series tires. A
215/60 may be OK, but much more than that should have a wider rim. In the
past I have used a 235/60 on a six-inch rim----sure, it’ll fit but the tire
just won’t “work” properly. I currently have 235/60’s on a seven-inch rim
and that’s a pretty good fit.

Tire pressure ? You’ll probably get 100 different answers. I usually run
about 3 psi below the max for day-to-day use. For highspeed highway work at
air 'em up to the max, FWIW.

Doug Dwyer
Longview, Washington USA

----- Original Message -----
From: SDiegoHoms@aol.com

Sorry to keep kicking an old tire, but have a few questions: One the
regular
Kent rims (85 XJ6) can one go to the wider 60 series tires? Also someone
wrote about tire pressure being 30 or 31 aren’t you supposed to keep them
at
the stated max 34-35 psi?

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http://www.jag-lovers.org/cgi-bin/majordomo

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