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You don=E2=80=99t actually have to calculate the circumference. If you =
have the number for the diameter (or height), you can just compare that =
with the original. Tire Rack gives diameter figures in its specs. Two =
tires with the same height have the same circumference.
--
Max Heim
'66 MGB
> On Jan 29, 2020, at 11:58 PM, Richard Lindsay via Mgs =
<mgs@autox.team.net> wrote:
>=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...
>=20
> Look up the original tire size for your car (or see if TireRack has =
that info). Then calculate the circumference of that tire. For example =
if the OEM tire is a 165r14 then the diameter is:
>=20
> D =3D (165=C3=97.8=C3=972)/25.4 + 14
>=20
> The radius is:
>=20
> R =3D D/2=20
>=20
> The circumference is:
>=20
> C =3D 2xRx3.14159
>=20
> This is the 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 spreadsheet. WAY easier.
> Just remember to include the new tire's aspect ratio. Old, =
unlabeled radials have an aspect ratio of about 0.8, as used above.
>=20
> Rick
>=20
> On Thu, Jan 30, 2020, 12:11 AM Michael MacLean via Mgs =
> Well, I screwed up. Reading the MG Experience forums I bought Douglas =
tires at a great price. Taking off the old tires tonight I found they =
were Dunlop SP-20s made in 1999. Wow! The size on the tire was 165R15. =
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 take 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 =
price. A 185/65 R15 is the next most popular tire, but smaller in =
diameter by an inch than the Dunlops I am taking off. 165R15 tires are =
25.65 inches in diameter. My head is about explode.
> Mike MacLean
> _______________________________________________
>=20
> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
> Suggested annual donation $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs =
<http://www.team.net/pipermail/mgs> http://autox.team.net/archive =
<http://autox.team.net/archive>
>=20
> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/richardolindsay@gmail.com =
<http://autox.team.net/mailman/options/mgs/richardolindsay@gmail.com>
> _______________________________________________
>=20
> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
> Suggested annual donation $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs =
<http://www.team.net/pipermail/mgs> http://autox.team.net/archive =
<http://autox.team.net/archive>
>=20
> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/mvheim@sonic.net =
<http://autox.team.net/mailman/options/mgs/mvheim@sonic.net>
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">You don=E2=80=99t actually have to calculate the =
circumference. If you have the number for the diameter (or height), you =
can just compare that with the original. Tire Rack gives diameter =
figures in its specs. Two tires with the same height have the same =
circumference.<div class=3D""><br class=3D""></div><div class=3D""><span =
style=3D"font-size: 13px;" class=3D"">--</span><br class=3D""><div =
class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div style=3D"color: rgb(0, 0, 0); =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"margin: 0px; font-size: 13px; min-height: =
16px;" class=3D"">Max Heim</div><div style=3D"margin: 0px; font-size: =
13px;" class=3D"">'66 MGB</div></div></div>
</div><div class=3D""><br class=3D"webkit-block-placeholder"></div><div =
class=3D""><br class=3D""></div>
<br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jan 29, 2020, at 11:58 PM, Richard Lindsay via Mgs <<a =
href=3D"mailto:mgs@autox.team.net"; class=3D"">mgs@autox.team.net</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
dir=3D"auto" style=3D"font-family: Verdana; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D"">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...<div dir=3D"auto" class=3D""><br =
class=3D""></div><div dir=3D"auto" class=3D"">Look up the original tire =
size for your car (or see if TireRack has that info). Then calculate the =
circumference of that tire. For example if the OEM tire is a 165r14 then =
the diameter is:</div><div dir=3D"auto" class=3D""><br =
class=3D""></div><div dir=3D"auto" class=3D"">D =3D (165=C3=97.8=C3=972)/2=
5.4 + 14</div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D"">The radius is:</div><div dir=3D"auto" =
class=3D""><br class=3D""></div><div dir=3D"auto" class=3D"">R =3D =
D/2 </div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D"">The circumference is:</div><div dir=3D"auto" =
class=3D""><br class=3D""></div><div dir=3D"auto" class=3D"">C =3D =
2xRx3.14159</div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D""> This is the 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 spreadsheet. WAY =
easier.</div><div dir=3D"auto" class=3D""> Just remember to =
include the new tire's aspect ratio. Old, unlabeled radials have an =
aspect ratio of about 0.8, as used above.</div><div dir=3D"auto" =
class=3D""><br class=3D""></div><div dir=3D"auto" =
class=3D"">Rick</div></div><br style=3D"font-family: Verdana; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><div class=3D"gmail_quote" =
style=3D"font-family: Verdana; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
dir=3D"ltr" class=3D"gmail_attr">On Thu, Jan 30, 2020, 12:11 AM Michael =
MacLean via Mgs <<a href=3D"mailto:mgs@autox.team.net"; =
class=3D"">mgs@autox.team.net</a>> wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin: 0px =
0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; =
border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div =
class=3D""><div style=3D"font-family: 'times new roman', 'new york', =
times, serif; font-size: 16px;" class=3D""><div dir=3D"ltr" =
class=3D"">Well, I screwed up. Reading the MG Experience forums I =
bought Douglas tires at a great price. Taking off the old tires =
tonight I found they were Dunlop SP-20s made in 1999. Wow! =
The size on the tire was 165R15. 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 take 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 =
price. A 185/65 R15 is the next most popular tire, but smaller in =
diameter by an inch than the Dunlops I am taking off. 165R15 tires =
are 25.65 inches in diameter. My head is about explode.<br =
class=3D""></div><div dir=3D"ltr" class=3D"">Mike MacLean<br =
class=3D""></div></div></div>_____________________________________________=
__<br class=3D""><br class=3D""><a href=3D"mailto:Mgs@autox.team.net"; =
target=3D"_blank" rel=3D"noreferrer" class=3D"">Mgs@autox.team.net</a><br =
class=3D"">Donate:<span class=3D"Apple-converted-space"> </span><a =
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class=3D"">Suggested annual donation $12.75<br class=3D""><br =
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