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Thanks Rick.=C2=A0 Your equations are definitely going into my "Technical =
Information" file.
Jack
On Thursday, January 30, 2020, 2:58:44 AM EST, Richard Lindsay via Mgs =
<mgs@autox.team.net> wrote: =20
=20
Mike, I recently did the same thing for my Land Rover. We like to think we=
're smart but we still make mistakes. And speaking of mistakes, here's what=
I would do...
Look up the original tire size for your car (or see if TireRack has that in=
fo). Then calculate the circumference of that tire. For example if the OEM =
tire is a 165r14 then the diameter is:
D =3D (165=C3=97.8=C3=972)/25.4 + 14
The radius is:
R =3D D/2=C2=A0
The circumference is:
C =3D 2xRx3.14159
=C2=A0 =C2=A0This is the tire circumfrence, in inches, for which your speed=
ometer is calibrated. If you want to keep that calibration, just reverse th=
e equations above and start poking in numbers from available sizes. I do th=
is in an Excel spreadsheet. WAY easier.=C2=A0 =C2=A0Just remember to includ=
e the new tire's aspect ratio. Old, unlabeled radials have an aspect ratio =
of about 0.8, as used above.
Rick
On Thu, Jan 30, 2020, 12:11 AM Michael MacLean via Mgs <mgs@autox.team.net>=
wrote:
Well, I screwed up.=C2=A0 Reading the MG Experience forums I bought Douglas=
tires at a great price.=C2=A0 Taking off the old tires tonight I found the=
y were Dunlop SP-20s made in 1999.=C2=A0 Wow!=C2=A0 The size on the tire wa=
s 165R15.=C2=A0 Without looking and going by the recommendation of the MG E=
xperience web site I bought 14 inch tires.=C2=A0 Crap.=C2=A0 Now I have to =
try to take them back.=C2=A0 They have not been mounted so they are still j=
ust like I got them.=C2=A0 My question is, what the heck size tire should I=
get for a 15 inch wire wheel rim?=C2=A0 The MG Experience forum is saying =
185/70 R15 is closest, (1/4 inch smaller) but not readily available for a d=
ecent price.=C2=A0 A 185/65 R15 is the next most popular tire, but smaller =
in diameter by an inch than the Dunlops I am taking off.=C2=A0 165R15 tires=
are 25.65 inches in diameter.=C2=A0 My head is about explode.
Mike MacLean
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Unsubscribe: http://autox.team.net/mailman/options/mgs/jwheeler1947@yahoo.c=
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=20
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<html><head></head><body><div class=3D"ydp4923e7bayahoo-style-wrap" style=
=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 1=
3px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Thanks Rick. Your equa=
tions are definitely going into my "Technical Information" file.</div><div =
dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D=
"false">Jack<br></div><div><br></div>
=20
</div><div id=3D"ydp3b2facc0yahoo_quoted_1198462637" class=3D"ydp3b=
2facc0yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Thursday, January 30, 2020, 2:58:44 AM EST, Richard =
Lindsay via Mgs <mgs@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydp3b2facc0yiv2748639516"><div><div>Mike, I=
recently did the same thing for my Land Rover. We like to think we're smar=
t but we still make mistakes. And speaking of mistakes, here's what I would=
do...<div><br clear=3D"none"></div><div>Look up the original tire size for=
your car (or see if TireRack has that info). Then calculate the circumfere=
nce of that tire. For example if the OEM tire is a 165r14 then the diameter=
is:</div><div><br clear=3D"none"></div><div>D =3D (165=C3=97.8=C3=972)/25.=
4 + 14</div><div><br clear=3D"none"></div><div>The radius is:</div><div><br=
clear=3D"none"></div><div>R =3D D/2 </div><div><br clear=3D"none"></d=
iv><div>The circumference is:</div><div><br clear=3D"none"></div><div>C =3D=
2xRx3.14159</div><div><br clear=3D"none"></div><div> This is t=
he tire circumfrence, in inches, for which your speedometer is calibrated. =
If you want to keep that calibration, just reverse the equations above and =
start poking in numbers from available sizes. I do this in an Excel spreads=
heet. WAY easier.</div><div> Just remember to include the new t=
ire's aspect ratio. Old, unlabeled radials have an aspect ratio of about 0.=
8, as used above.</div><div><br clear=3D"none"></div><div>Rick</div></div><=
br clear=3D"none"><div class=3D"ydp3b2facc0yiv2748639516gmail_quote"><div c=
lass=3D"ydp3b2facc0yiv2748639516yqt3703919385" id=3D"ydp3b2facc0yiv27486395=
16yqt71448"><div class=3D"ydp3b2facc0yiv2748639516gmail_attr" dir=3D"ltr">O=
n Thu, Jan 30, 2020, 12:11 AM Michael MacLean via Mgs <<a shape=3D"rect"=
href=3D"mailto:mgs@autox.team.net"; rel=3D"nofollow" target=3D"_blank">mgs@=
autox.team.net</a>> wrote:<br clear=3D"none"></div><blockquote class=3D"=
ydp3b2facc0yiv2748639516gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex;"><div><div style=3D"font-family:times new=
roman, new york, times, serif;font-size:16px;"><div dir=3D"ltr">Well, I sc=
rewed up. Reading the MG Experience forums I bought Douglas tires at =
a great price. Taking off the old tires tonight I found they were Dun=
lop SP-20s made in 1999. Wow! The size on the tire was 165R15.&=
nbsp; Without looking and going by the recommendation of the MG Experience =
web site I bought 14 inch tires. Crap. Now I have to try to tak=
e them back. They have not been mounted so they are still just like I=
got them. My question is, what the heck size tire should I get for a=
15 inch wire wheel rim? The MG Experience forum is saying 185/70 R15=
is closest, (1/4 inch smaller) but not readily available for a decent pric=
e. A 185/65 R15 is the next most popular tire, but smaller in diamete=
r by an inch than the Dunlops I am taking off. 165R15 tires are 25.65=
inches in diameter. My head is about explode.<br clear=3D"none"></di=
v><div dir=3D"ltr">Mike MacLean<br clear=3D"none"></div></div></div>_______=
________________________________________<br clear=3D"none">
<br clear=3D"none">
<a shape=3D"rect" href=3D"mailto:Mgs@autox.team.net"; rel=3D"nofollow" targe=
t=3D"_blank">Mgs@autox.team.net</a><br clear=3D"none">
ofollow" target=3D"_blank">http://www.team.net/donate.html</a><br clear=3D"=
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</blockquote></div></div></div></div><div class=3D"ydp3b2facc0yqt3703919385=
" id=3D"ydp3b2facc0yqt63568">______________________________________________=
_<br clear=3D"none"><br clear=3D"none"><a shape=3D"rect" href=3D"mailto:Mgs=
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