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Here is a modern add for a vintage set of Sports Car Specials that
describes some of the dimensions.
https://vintagewheelsus.com/index.php?main_page=3Dproduct_info&products_id=
=3D357
*Brad Eells*
*Chino CA*
*#72 FP 1969 Triumph Spitfire Mk3*
*#35 DP 1962 Triumph TR4*
*1965 Triumph TR4A IRS...for the road!*
On Thu, Jun 27, 2019 at 2:29 PM dustin nicholson via Fot <fot@autox.team.ne=
t>
wrote:
> To determine the size of the old tire in modern designation format measur=
e
> the tread width in millimeters, I=E2=80=99m guessing 5.5 inches times 25.=
4 =3D 140,
> that=E2=80=99s your first number.
>
> I=E2=80=99m guessing 9.20 is the dimension in inches of the top side wall=
+ The
> bottom side wall. When added to the 15 inch wheel diameter it would give
> you a tire diameter of 24.20 inches. This is just a guess of what they me=
an
> by 9.20.
>
> Next, Measure the side wall height in millimeters, I=E2=80=99m guessing 9=
.20
> inches/2 x 25.4 =3D 117mm. Divide 117 sidewall height by the 140 tread wi=
dth
> gives you a height to width ratio of 1.20 which is your second number...
> but they don=E2=80=99t show the decimal so it reads as 120.
>
> So the old 5.50-9.20-15 =3D a new 140-120-15 (if my guess of what 9.20 me=
ans
> is correct, if not, just measure the sidewall as my 120 number would be
> wrong).
>
> It appears that the old tire is 1.7 inches narrower than your new
> 185-65-15 and there is only 1/10 of an inch difference in the tire height=
.
>
> Dustin
>
> Sent from my iPhone
>
> On Jun 27, 2019, at 1:19 PM, Redmond via Fot <fot@autox.team.net> wrote:
>
> I should've been a little bit more clear than mud.
>
> I'm just curious as to what the size tire he was running back in the
> 1960's. Can anyone translate the 5.50-9.20-15 into today's sizing.
>
> FYI - I'm going with the 185-65-15
>
> Todd
>
>
>
> On June 27, 2019 at 11:08 AM Redmond via Fot <fot@autox.team.net> wrote:
>
> Friends,
>
>
> Curious question:
>
> I have 1 Goodyear Blue Streak tire from when my dad raced my TR3.
>
> Size says 5.50-9.20-15
>
> What size would this be in today's sizing?
>
> Thanks
>
> Todd
>
>
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/alfetta95@optonline.net
>
>
>
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/nicholsondustin@yahoo.com
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/tr4abrad@gmail.com
>
>
>
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<div dir=3D"ltr">Here is a modern add for a vintage set of Sports Car Speci=
als that describes some of the dimensions.=C2=A0<div><br></div><div><a href=
=3D"https://vintagewheelsus.com/index.php?main_page=3Dproduct_info&prod=
ucts_id=3D357">https://vintagewheelsus.com/index.php?main_page=3Dproduct_in=
fo&products_id=3D357</a>=C2=A0</div><div><br></div><div>=C2=A0<br clear=
=3D"all"><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"=
gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"lt=
r"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div=
dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D=
"ltr"><div><div style=3D"font-size:12.8px"><b><font color=3D"#000000">Brad =
Eells</font></b></div><div style=3D"font-size:12.8px"><b><font color=3D"#00=
0000">Chino CA</font></b></div><div style=3D"font-size:12.8px"><b><font col=
or=3D"#000000">#72 FP 1969 Triumph Spitfire Mk3</font></b></div><div style=
=3D"font-size:12.8px"><b><font color=3D"#000000">#35 DP 1962 Triumph TR4</f=
ont></b></div><div style=3D"font-size:12.8px"><b><font color=3D"#000000">19=
65 Triumph TR4A IRS...for the road!</font></b><br></div></div><div style=3D=
"font-size:12.8px"><b><font color=3D"#000000"><img src=3D"https://docs.goog=
le.com/uc?export=3Ddownload&id=3D1HyYLxa1_Lz_Q0kLM3GRJryNDgfOwZyUc&=
revid=3D0B9vVTDWaFCqFVmR6Q1FsMExZTHVLcHpja3BpSC9ucGcveHdJPQ" width=3D"96" h=
eight=3D"94"><br></font></b></div><div><br></div></div></div></div></div></=
div></div></div></div></div></div></div></div></div></div></div></div><br><=
/div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_a=
ttr">On Thu, Jun 27, 2019 at 2:29 PM dustin nicholson via Fot <<a href=
=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>> wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">To deter=
mine the size of the old tire in modern designation format measure the trea=
d width in millimeters, I=E2=80=99m guessing 5.5 inches times 25.4 =3D 140,=
that=E2=80=99s your first number.<div><br></div><div>I=E2=80=99m guessing =
9.20 is the dimension in inches of the top side wall + The bottom side wall=
. When added to the 15 inch wheel diameter it would give you a tire diamete=
r of 24.20 inches. This is just a guess of what they mean by 9.20.</div><di=
v><br></div><div>Next, Measure the side wall height in millimeters, I=E2=80=
=99m guessing 9.20 inches/2 x 25.4 =3D 117mm. Divide 117 sidewall height by=
the 140 tread width gives you a height to width ratio of 1.20 which is you=
r second number... but they don=E2=80=99t show the decimal so it reads as 1=
20.</div><div><br></div><div>So the old 5.50-9.20-15 =3D a new 140-120-15 (=
if my guess of what 9.20 means is correct, if not, just measure the sidewal=
l as my 120 number would be wrong).</div><div><br></div><div>It appears tha=
t the old tire is 1.7 inches narrower than your new 185-65-15 and there is =
only 1/10 of an inch difference in the tire height.</div><div><br></div><di=
v>Dustin<br><br><div id=3D"gmail-m_6326168714934323876AppleMailSignature" d=
ir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br>On Jun 27, 2019, a=
t 1:19 PM, Redmond via Fot <<a href=3D"mailto:fot@autox.team.net"; target=
=3D"_blank">fot@autox.team.net</a>> wrote:<br><br></div><blockquote type=
=3D"cite"><div dir=3D"ltr">
=20
<p style=3D"font-family:Helvetica">I should've been a little bit more c=
lear than mud.=C2=A0 <br></p><p style=3D"font-family:Helvetica">I'm jus=
t curious as to what the size tire he was running back in the 1960's. C=
an anyone translate the 5.50-9.20-15 into today's sizing.<br></p><p sty=
le=3D"font-family:Helvetica">FYI - I'm going with the 185-65-15<br></p>=
<p style=3D"font-family:Helvetica">Todd<br></p><p style=3D"font-family:Helv=
etica"><br></p><p style=3D"font-family:Helvetica"><br></p><blockquote type=
=3D"cite">On June 27, 2019 at 11:08 AM Redmond via Fot <<a href=3D"mailt=
o:fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a>> wrote: <=
br> <br><p style=3D"font-family:Helvetica">Friends,<br></p><p style=3D"font=
-family:Helvetica"><br></p><p style=3D"font-family:Helvetica">Curious quest=
ion:<br></p><p style=3D"font-family:Helvetica">I have 1 Goodyear Blue Strea=
k tire from when my dad raced my TR3.<br></p><p style=3D"font-family:Helvet=
ica">Size says 5.50-9.20-15<br></p><p style=3D"font-family:Helvetica">What =
size would this be in today's sizing?<br></p><p style=3D"font-family:He=
lvetica">Thanks<br></p><p style=3D"font-family:Helvetica">Todd<br></p></blo=
ckquote><p style=3D"font-family:Helvetica" class=3D"gmail-m_632616871493432=
3876default-style"><br>=C2=A0</p><blockquote type=3D"cite">________________=
_______________________________ <br><a href=3D"mailto:fot@autox.team.net"; t=
arget=3D"_blank">fot@autox.team.net</a> <br> <br><a href=3D"http://www.fot-=
racing.com" target=3D"_blank">http://www.fot-racing.com</a> <br> <br>Donate=
: <a href=3D"http://www.team.net/donate.html"; target=3D"_blank">http://www.=
team.net/donate.html</a> <br>Archive: <a href=3D"http://autox.team.net/arch=
ive" target=3D"_blank">http://autox.team.net/archive</a> <a href=3D"http://=
www.team.net/pipermail/fot" target=3D"_blank">http://www.team.net/pipermail=
/fot</a> <br>Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/o=
ptions/fot/alfetta95@optonline.net" target=3D"_blank">http://autox.team.net=
/mailman/options/fot/alfetta95@optonline.net</a> <br> <br> <br></blockquote=
><p style=3D"font-family:Helvetica" class=3D"gmail-m_6326168714934323876def=
ault-style"><br>=C2=A0</p>
</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr"><span>______=
_________________________________________</span><br><span><a href=3D"mailto=
:fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a></span><br><sp=
an></span><br><span><a href=3D"http://www.fot-racing.com"; target=3D"_blank"=
>http://www.fot-racing.com</a></span><br><span></span><br><span>Donate: <a =
href=3D"http://www.team.net/donate.html"; target=3D"_blank">http://www.team.=
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an><br><span></span><br><span></span><br></div></blockquote></div></div>___=
____________________________________________<br>
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.team.net<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D"_blank">=
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et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" targe=
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<br>
<br>
</blockquote></div>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
--===============4031058944622548044==--
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