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Old 08-08-2012, 01:08 PM   #21
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here's a good thread on weight diff.

has BSTs forged and magnesium as well

http://www.apriliaforum.com/forums/s...=wheel+weights



BST front 5 lb, 6.1oz or 2.5 kg

BST rear 8 lb, 7oz or 3.8 kg
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Old 08-08-2012, 01:14 PM   #22
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Yeah, I think it was a total of about 10 pounds or so lighter than stock.
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Old 08-08-2012, 02:48 PM   #23
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, that is a lot of rot. weight loss!

It was explained to me that it also has to do with the distribution of weight in the wheels. The weight being concentrated in the center. It's like holding a baseball bat, It still weighs the same no matter how you hold it, but when you swing it from the opposite end, it's easier to swing and feels lighter...I'll have to find the quote I read about that from...explained a bit more than I did
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Last edited by dudewhrsmybike; 08-08-2012 at 02:51 PM.
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Old 08-09-2012, 09:36 AM   #24
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How much did they cost?
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Old 08-09-2012, 09:42 AM   #25
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Too much! Haha.. They are nice though!
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Old 08-09-2012, 09:48 AM   #26
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Quote:
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How much did they cost?
there's a set on ebay for my bike, $3500
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Old 08-09-2012, 09:59 AM   #27
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New, they run anywhere from $3600 to about $4000 depending on where you get them. Get with Jack if you're interested in some. There's usually nothing he can't get.
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Old 08-09-2012, 01:34 PM   #28
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Quote:
Originally Posted by dudewhrsmybike View Post
, that is a lot of rot. weight loss!

It was explained to me that it also has to do with the distribution of weight in the wheels. The weight being concentrated in the center. It's like holding a baseball bat, It still weighs the same no matter how you hold it, but when you swing it from the opposite end, it's easier to swing and feels lighter...I'll have to find the quote I read about that from...explained a bit more than I did
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.
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Old 08-09-2012, 01:53 PM   #29
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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.

So basically, it saves a shitload of rotating mass. LOL
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Old 08-09-2012, 02:56 PM   #30
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^^ nerd!
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Old 08-18-2012, 10:06 AM   #31
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wow cant believe i miss this thread glad you like em Charlie!!
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Old 08-18-2012, 12:35 PM   #32
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I'd love to experience the difference. The effort to initiate a turn at track speeds much be hugely different.

How fragile are CF wheels - are they a track-only application? Does anyone use them on the street?
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Old 08-18-2012, 07:37 PM   #33
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MotoMummy (shop out of Austin area) has a YouTube video of a CF wheel and tossing it to the ground, throwing it, bouncing it... Hardly any damage. They strong wheels, but not legal in Superstock races.
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Old 08-18-2012, 07:55 PM   #34
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Old 08-18-2012, 08:16 PM   #35
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Quote:
Originally Posted by Bald 'n Gimpy View Post
MotoMummy (shop out of Austin area) has a YouTube video of a CF wheel and tossing it to the ground, throwing it, bouncing it... Hardly any damage. They strong wheels, but not legal in Superstock races.
Gawd

Video only works through link, can't embed so here's the link...

http://forum.motomummy.com/index.php...ttle-bst-test/
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Old 08-18-2012, 08:37 PM   #36
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They're strong. A guy on the R1 forum has had a set since '03 and I'm told they still look like new. I think magnesium wheels might be a little lighter but have to be x-ray once a year for stress cracks. I'm not really a track guy. I just wanted a set real bad and finances finally balanced enough for me to fit them into the budget.
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Old 08-19-2012, 11:19 AM   #37
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Quote:
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They're strong. A guy on the R1 forum has had a set since '03 and I'm told they still look like new. I think magnesium wheels might be a little lighter but have to be x-ray once a year for stress cracks. I'm not really a track guy. I just wanted a set real bad and finances finally balanced enough for me to fit them into the budget.
, I want YOUR budget!!!
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Old 08-19-2012, 08:04 PM   #38
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Lets see a pic of them mounted already. Didn't see a video in the link.

sent from my Samsung note
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Old 08-19-2012, 08:20 PM   #39
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Drag racer love them too. It's easier to get a light wheel spinning
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Old 08-19-2012, 08:59 PM   #40
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