Subject: [Fot] TR 3/4 Southwick axle/bearing follow-up

From: fubog1 via Fot <[email-masked]>
Date: Tue, 27 Jan 2026 21:32:11 +0000 (UTC)

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Hi all-=C2=A0This is a follow-up to myrecent post re TR-4/4 southwick axle =
specs & bearing fitting.Apparently this was discussed around 5years ago but=
 I missed it, so I'm posting it again for those unawareof it.The problem is=
 that most of thereplacement bearings don't fit, including the chicom Timke=
ns.The corner radius of the inner race ismuch smaller than the axle journal=
 radius, where the inner race buttsup against the axle shoulder, preventing=
 the bearing race frompressing fully home.This effectively weakens the axle=
 sinceall of the stresses remain in the axle inside corner radius, insteado=
f being distributed into the hub.I measured a RW507ER Timken, National &unk=
nown chicom bearing & all had a small radius.The only bearing that actually=
 fits isthe 9507F =E2=80=9Csmall ford=E2=80=9D bearing from Moser, unknown =
manufacturer.The photo below clearly shows that theMoser bearing inner race=
 is relieved/clearanced out in the last =C2=BC inch or sobefore the radius,=
 so the bearing presses fully home as intended.BTW this is easily checked w=
/a feelergauge, there should be NO clearance between the inner race & axles=
houlder.
And many THANKS to those who respondedto my post!

Glen Efinger

Moser on leftrepresentative of the other 3 right
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<html><head></head><body><div class=3D"yahoo-style-wrap" style=3D"font-fami=
ly:Arial, Helvetica, sans-serif;font-size:16px;"><div dir=3D"ltr" data-setd=
ir=3D"false"><div>
<div style=3D"margin-bottom: 0in">Hi all-&nbsp;</div><div style=3D"margin-b=
ottom: 0in" dir=3D"ltr" data-setdir=3D"false">This is a follow-up to my
recent post re TR-4/4 southwick axle specs &amp; bearing fitting.</div>
<div style=3D"margin-bottom: 0in">Apparently this was discussed around 5
years ago but I missed it, so I'm posting it again for those unaware
of it.</div><div style=3D"margin-bottom: 0in">The problem is that most of t=
he
replacement bearings don't fit, including the chicom Timkens.</div><div sty=
le=3D"margin-bottom: 0in">The corner radius of the inner race is
much smaller than the axle journal radius, where the inner race butts
up against the axle shoulder, preventing the bearing race from
pressing fully home.</div><div style=3D"margin-bottom: 0in">This effectivel=
y weakens the axle since
all of the stresses remain in the axle inside corner radius, instead
of being distributed into the hub.</div><div style=3D"margin-bottom: 0in">I=
 measured a RW507ER Timken, National &amp;
unknown chicom bearing &amp; all had a small radius.</div><div style=3D"mar=
gin-bottom: 0in">The only bearing that actually fits is
the 9507F =E2=80=9Csmall ford=E2=80=9D bearing from Moser, unknown manufact=
urer.</div><div style=3D"margin-bottom: 0in">The photo below clearly shows =
that the
Moser bearing inner race is relieved/clearanced out in the last =C2=BC inch=
 or so
before the radius, so the bearing presses fully home as intended.</div><div=
 style=3D"margin-bottom: 0in" dir=3D"ltr" data-setdir=3D"false">BTW this is=
 easily checked w/a feeler
gauge, there should be NO clearance between the inner race &amp; axle
shoulder.</div>
<p style=3D"margin-bottom: 0in">And many THANKS to those  who responded
to my post!</p>
<p style=3D"margin-bottom: 0in">Glen Efinger</p>
</div></div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"lt=
r" data-setdir=3D"false">Moser on left</div><div dir=3D"ltr" data-setdir=3D=
"false">representative of the other 3 right</div></div></body></html>
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Content-ID: <[email-masked]>

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_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

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From: Chris Marx via Fot <[email-masked]>
Date: Tue, 27 Jan 2026 22:41:05 +0100

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As a work around.

Put the race on a lathe and grind out radius to fit.

=20

Cheers

Chris

=20

From: Fot <[email-masked]> On Behalf Of fubog1 via Fot
Sent: Tuesday, January 27, 2026 10:32 PM
To: FOT Triumph <[email-masked]>
Subject: [Fot] TR 3/4 Southwick axle/bearing follow-up

=20

Hi all-=20

This is a follow-up to my recent post re TR-4/4 southwick axle specs & =
bearing fitting.

Apparently this was discussed around 5 years ago but I missed it, so I'm =
posting it again for those unaware of it.

The problem is that most of the replacement bearings don't fit, =
including the chicom Timkens.

The corner radius of the inner race is much smaller than the axle =
journal radius, where the inner race butts up against the axle shoulder, =
preventing the bearing race from pressing fully home.

This effectively weakens the axle since all of the stresses remain in =
the axle inside corner radius, instead of being distributed into the =
hub.

I measured a RW507ER Timken, National & unknown chicom bearing & all had =
a small radius.

The only bearing that actually fits is the 9507F =E2=80=9Csmall =
ford=E2=80=9D bearing from Moser, unknown manufacturer.

The photo below clearly shows that the Moser bearing inner race is =
relieved/clearanced out in the last =C2=BC inch or so before the radius, =
so the bearing presses fully home as intended.

BTW this is easily checked w/a feeler gauge, there should be NO =
clearance between the inner race & axle shoulder.

And many THANKS to those who responded to my post!

Glen Efinger

=20

Moser on left

representative of the other 3 right

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--></style></head><body lang=3DEN-US link=3D"#467886" vlink=3D"#96607D" =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><span lang=3DDE style=3D'font-size:11.0pt'>As a work =
around.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Put the race on a lathe and grind out radius =
to fit.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Cheers<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Chris<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DDE =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span lang=3DDE =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> Fot =
&lt;[email-masked]&gt; <b>On Behalf Of </b>fubog1 via =
Fot<br><b>Sent:</b> Tuesday, January 27, 2026 10:32 PM<br><b>To:</b> FOT =
Triumph &lt;[email-masked]&gt;<br><b>Subject:</b> [Fot] TR 3/4 =
Southwick axle/bearing follow-up<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><div><div><p =
class=3DMsoNormal><span style=3D'font-family:"Arial",sans-serif'>Hi =
all-&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>This is a follow-up to my =
recent post re TR-4/4 southwick axle specs &amp; bearing =
fitting.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>Apparently this was discussed =
around 5 years ago but I missed it, so I'm posting it again for those =
unaware of it.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-family:"Arial",sans-serif'>The =
problem is that most of the replacement bearings don't fit, including =
the chicom Timkens.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-family:"Arial",sans-serif'>The =
corner radius of the inner race is much smaller than the axle journal =
radius, where the inner race butts up against the axle shoulder, =
preventing the bearing race from pressing fully =
home.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>This effectively weakens the =
axle since all of the stresses remain in the axle inside corner radius, =
instead of being distributed into the =
hub.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>I measured a RW507ER Timken, =
National &amp; unknown chicom bearing &amp; all had a small =
radius.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>The only bearing that actually =
fits is the 9507F =E2=80=9Csmall ford=E2=80=9D bearing from Moser, =
unknown manufacturer.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-family:"Arial",sans-serif'>The =
photo below clearly shows that the Moser bearing inner race is =
relieved/clearanced out in the last =C2=BC inch or so before the radius, =
so the bearing presses fully home as =
intended.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>BTW this is easily checked w/a =
feeler gauge, there should be NO clearance between the inner race &amp; =
axle shoulder.<o:p></o:p></span></p></div><p =
style=3D'margin-bottom:0cm'><span =
style=3D'font-family:"Arial",sans-serif'>And many THANKS to those who =
responded to my post!<o:p></o:p></span></p><p =
style=3D'margin-bottom:0cm'><span =
style=3D'font-family:"Arial",sans-serif'>Glen =
Efinger<o:p></o:p></span></p></div></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'><o:p>&nbsp;</o:p></span></p></di=
v><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>Moser on =
left<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>representative of the other 3 =
right<o:p></o:p></span></p></div></div></div></body></html>
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