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Old 03-28-2008, 01:05 AM   #7 (permalink)
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Join Date: Dec 2007
Location: San Jose
Posts: 319

Pablo - '07 Hyundai Santa Fe AWD
90 day: 23.62 mpg (US)
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I'm looking at narrower but heavier and taller tires.

Current tires are 235/70R16s which are 29.1" tall and 32 pounds rated at 44 psi and driven at 55 psi.

I'm looking at replacing them with 215/85R16s. They tend to run around 30.4", 0.7" taller and about 4½% more gearing which should nullify the speedo error. Nearly all models are heavier. Some as much 47-48 pounds. The weight wouldn't help in the city stuff. Rotational mass is the bane of all cyclists.

The D rated tires in this size are rated to 65 psi and the E rated tires 80 psi. It would be nice to get rolling resistance and noise specs...

Think they'd help? The aero could get worse from the vehicle being even taller. The gearing change should be minimal but help on the hwy unless lost to aero. They take mega PSI...
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