Tire/rim size?

[msd1107]

Very impressive, and it appears to be quite accurate.

Years ago, I did a spreadsheet that accomplished some of this and quite a bit more. It is still somewhere on LotusElan.net.

Given an input tire/wheel size, it had a sheet sorted by tire rev/mile. It had all tire/wheel sizes within 1% displayed in green, so that the user had all very close matches shown at once. Sizes within 2% were displayed in yellow, within 3% displayed in red.

The rev/mile figure was the average from the data provided by the tire manufacturers, which often had a range of values even for the same tire size that was also shown.

Remember, the tire rev/mile figure changes by up to 3% during the life of the tire. Inflation pressure also has an effect.

David
1968 36/7988

[alan.barker]

A spread sheet with the info and facts sounds good to help everyone
Alan

[msd1107]

From a previous post:

There is a down loadable spreadsheet 20080411zGearRatios.xls that is available at lotus-electrical-f38/speed-rpm-t23817.html at the bottom. It has a sheet TiresS that has tyre sizes sorted by rev/mile so that you can see all combinations close to a particular size. The tyre size has a clickable link to TireRack (it used to work years ago, anyway) so that you can see different manufacturers for each size, at least for US customers.

There is another down loadable spreadsheet at lotus-suspension-f42/updated-spreadsheets-t18445.html that offers different views of tyre/diff/rpm etc. It also has tyre rev/mile data.

David
1968 36/7988