by **KCStudly** » Mon Jun 01, 2015 3:36 pm

5 x 4-1/2 is a very common trailer wheel pattern. Also common on many Jeeps (TJ's, Cherokees, YJ's), small Ford pattern (early V8 Mustangs), and early Mopar, among others. Just be sure to check back spacing and hub diameter.

The rim size is not what matters. It is the size of the tire, or more accurately, the height of the spindle above the ground, which is determined by the tire, not the rim.

Easy enough to write the equation:

Rev per mile = (1 rev / effective tire circumference in inches*) x 5280 ft/mile x 12 inches/ft

* you can cheat and just use the tire circumference, either by measuring around the tread, or multiplying the advertised diameter x Pi (for Pi we can use 3.14). For a more accurate result use spindle height above ground x 2 x Pi. Spindle height is a more accurate representation of the effective tire radius. Be advised that the side wall size designation on your tires is usually only an approximation and can vary by a lot from the true rolling radius. The weight of the trailer affects this value due to the tread conforming to the ground, and manufacturers have been known to fudge the truth, especially in the off road tire industry.

So to compare a small trailer tire with an 18 inch diameter, with a 27 inch tire that may have come off a stock Jeep we get...

{1 / (18 x 3.14)} x 5280 x 12 = 1121 revs

vs.

{1 / (27 x 3.14)} x 5280 x 12 = 747.3 revs

Last edited by

KCStudly on Tue Jun 02, 2015 2:47 pm, edited 1 time in total.

KC

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