abysmal mileage! - Toyota Yaris Forums

djct_watt · 01-16-2010, 09:36 PM

Rotational Inertia = Mass x (Radius^2)

You're better off making your wheels wider than making them bigger in radius (diameter). Just wait till you kill your brakes too (increasing RI has negative effects on both acceleration AND deceleration)!

Everyone swears that big wheels are sporty. . . but they're not. Every purpose built sports car doesn't have big wheels just for the sake of having big wheels. They have big wheels because anything smaller will not fit over the gigantic brake discs. The rule of thumb is to get the SMALLEST wheel possible that will clear the brake caliper. Proper sport tires (with a high PSI and stiff sidewall) will not flex under heavy loads. Take a look at F1 or NASCAR. They BOTH take corners at 150+ MPH and none of those cars have rubber band tires. . .

Granted, it's harder to shop for a proper street tire for a smaller diameter wheel. But unless you have a BBK, anything larger than 15", IMO, is just for looks.

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01-16-2010, 09:36 PM	#19
djct_watt Drives: 2010 NCP91 5spd Join Date: Nov 2009 Location: Thailand Posts: 449	Rotational Inertia = Mass x (Radius^2) You're better off making your wheels wider than making them bigger in radius (diameter). Just wait till you kill your brakes too (increasing RI has negative effects on both acceleration AND deceleration)! Everyone swears that big wheels are sporty. . . but they're not. Every purpose built sports car doesn't have big wheels just for the sake of having big wheels. They have big wheels because anything smaller will not fit over the gigantic brake discs. The rule of thumb is to get the SMALLEST wheel possible that will clear the brake caliper. Proper sport tires (with a high PSI and stiff sidewall) will not flex under heavy loads. Take a look at F1 or NASCAR. They BOTH take corners at 150+ MPH and none of those cars have rubber band tires. . . Granted, it's harder to shop for a proper street tire for a smaller diameter wheel. But unless you have a BBK, anything larger than 15", IMO, is just for looks.