05-30-2013, 06:36 PM
Join Date: Mar 2009
Location: Georgetown, Guyana
The 205/??/?? sizing is known as metric sizing, a 29 is a 29 inch flotation size, and represents the outer diameter of the tire
Get yourself a tire size calculator and calculate the outer diameter of metric size and you can compare them.
A 205/80R15 tire would work out to 27.91 inches so it's comparable to a 28.
It's also important to understand that you can compensate for the effects of a larger tire on performance by changing either the transfer case gearing (on a Samurai) or the final drive ratios (on most vehicles) - so you need to consider clearance as well as gearing.
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05 - 2.0 Suzuki Grand Vitara - JB420
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