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Old 08-19-2012, 09:01 PM   #41
Chuckster
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Join Date: Dec 2010
Location: Alvin
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Quote:
Originally Posted by Bald 'n Gimpy View Post
, I want YOUR budget!!!

It's gonna be a while before she let's me drop this much cash again. LOL. Looks like I get to buy more jewelry for her now.
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Old 08-19-2012, 09:02 PM   #42
brian1570
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Experience: 10+ years

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Quote:
Originally Posted by Volfy View Post
Yep, it's called rotational inertia. It's measured in kg-m^2 or lbm-ft^2.

1 lbm x (0.25ft)^2 = 0.06

1 lbm x (0.7ft)^2 = 0.50

0.25ft is 3in. 0.7ft is 8.5in, which is half of 17in.

So a 1 lb mass on the rim carries nearly 10 times more rotational inertia than the same 1 lb mass 3" from the hub. Now then, the typical 17" sport bike wheel is spinning at about 1000RPM at 80mph. The effect of that rotation inertial multiplies even more the faster that wheel spins.


Sorry for geeking out on the math. Couldn't resist.
no wonder those rims are so expensive!
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