[TR] TR3A Brake Rotors

Cosmo Kramer tr4a2712 at yahoo.com
Tue Mar 9 17:08:33 MST 2010

 Date: Mon, 8 Mar 2010 12:54:58 -0800
From: "Randall" <tr3driver at ca.rr.com>
Subject: Re: [TR] TR3A Brake Rotors

> I'd like
> to have them turned at the shop I use, only they don't have 
> a minimum
> rotor thickness spec. for the TR3A.

I have never found an official "minimum thickness" from the factory.
However, the workshop manual says to never remove more than .060", and the
original thickness appears to be .500".  So I think .440" is a pretty good


Here is what I have on this thread that has been discussed in the past:
Subject:             Rotor Thickness
Date:               Tue, 28 May 2002
From:             <WBabbitt at aol.com>
<Bwfox at aol.com> writes:
> Listerati:
> What is the minimum safe thickness for TR4A brake rotors?
> -Barry Fox
My new TR4A rotors (I believe they came from TRF) have a minimum thickness of
11.4 mm stamped on them.
According to the Bentley Manual, minimum thickness is 11.18 mm. You pick it,
-Bill Babbitt
 ---------------------------------  &  
Subject:             240Z brake drums & rotor thickness
Date:               Sat, 08 Jan 2000
From:             Alan Myers <reagntsj at ricochet.net>
In case it is helpful to anyone on the list, just checked a new TR4 rotor in
the garage & it is marked min. thickness 11.3 mm, which I believe converts to
.44 inch. Since it's new, I measured the starting thickness & found it is
.505, which means you have .065 of wear allowed over the life of the rotor. I
am guessing that TR3 through TR6 are probably about the same. May be diff. for
some of the other Triumphs out there.
The min. thickness on this rotor (Brembo) is stamped into the outside rim.
I've also seen it cast into the hub area of the rotor.
-Alan Myers
BTW- These threads where taken out of my TR4/A E-mail repair manual.

-Cosmo Kramer

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