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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 <fot-bounces@autox.team.net> On Behalf Of fubog1 via Fot
Sent: Tuesday, January 27, 2026 10:32 PM
To: FOT Triumph <fot@autox.team.net>
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> </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> </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 =
<fot-bounces@autox.team.net> <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 <fot@autox.team.net><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> </o:p></p><div><div><div><div><p =
class=3DMsoNormal><span style=3D'font-family:"Arial",sans-serif'>Hi =
all- <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 & 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 & unknown chicom bearing & 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 & =
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> </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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