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--></style></head><body lang="EN-CA" link="#0563C1" vlink="#954F72"><div class="WordSection1"><p class="MsoPlainText">>Date: Sun, 31 May 2020 16:52:23 -0500</p><p class="MsoPlainText">>From: bill beecher <<a href="mailto:notakitcar@yahoo.com">notakitcar@yahoo.com</a>></p><p class="MsoPlainText">>Subject: [TR] RPM speed calc</p><p class="MsoPlainText">> </p><p class="MsoPlainText">>Came across this calculator with all the right input fields. But, I wonder how accurate it really is given the following input. </p><p class="MsoPlainText">>TR3 with a 3.7 rear, OD at redline of 5,000rpm. Vredestein 165R/15 tires, 25.4? diameter. Should be moving along at 124mph!</p><p class="MsoPlainText">> </p><p class="MsoPlainText">><a href="https://wahiduddin.net/calc/calc_speed_rpm.htm">https://wahiduddin.net/calc/calc_speed_rpm.htm</a></p><p class="MsoPlainText">> </p><p class="MsoPlainText">>Anyone get a different answer? </p><p class="MsoPlainText">>Bill</p><p class="MsoNormal"> </p><p class="MsoNormal">Here (attached) is a spreadsheet that I wrote to calculate speed versus rpm given different parameters. I wrote it to check my speedo after I installed an HVDA transmission. If the spreadsheet doesn’t make it through the list as an attachment, just e-mail me directly and I’ll send it to you.</p><p class="MsoNormal"> </p><p class="MsoNormal">With a standard Triumph gearbox + overdrive, and the parameters you gave, I calculate speed at 5000 rpm in top gear (with overdrive) as being 124.5 mph. Note that, I think that the tire diameter is 25.25”, slightly less than you indicated.</p><p class="MsoNormal"> </p><p class="MsoNormal">I hasten to add that calculating a speed and believing it’s achievable are two different things!</p><p class="MsoNormal"> </p><p class="MsoNormal">Regards,</p><p class="MsoNormal"> </p><p class="MsoNormal">Dave MacKay</p><p class="MsoNormal">1960 TR3A s/n 68639L</p><p class="MsoNormal">near Toronto, Canada</p></div></body></html>