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Old 03-24-2009, 10:26 AM   #1
Slick23
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dumb question on wheels

Why do mx bikes have spoke wheels and street sport bikes have mag wheels? Both can be extremely light and strong. mx bikes take a huge pounding on the wheels and still super light.mag wheels can be tubeless. what am i missing?
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Old 03-24-2009, 10:52 AM   #2
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most sportbikes have cast aluminum wheels. They really CAN'T take the pounding a spoked wheel can. Also, spoke wheels bend when pushed to hard, cast wheels break.
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Old 03-24-2009, 10:57 AM   #3
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my guess is the spokes cant handle the speeds sportbikes get up to and maintain
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Old 03-24-2009, 11:00 AM   #4
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for the strength needed for a street/performance bike, the wheels would be very heavy.
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Old 03-24-2009, 11:01 AM   #5
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Suspension take alot of the grunt on dirtbikes.

Spoke wheels can be bent by installing tires alone.
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Old 03-24-2009, 03:22 PM   #6
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Dirt bikes have tubes so they can run spokes.
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Old 03-24-2009, 04:55 PM   #7
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One reason. Horsepower and torque.

Spoke wheels needed to hold the RWHP of a 1000 or even a 600 would weigh a ton vs. a cast wheel.
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Old 03-24-2009, 10:59 PM   #8
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It's because spoke wheels can't handle the acceleration forces that high powered sportbikes can put out. They are inherently flexible rotationally. Would you really trust 60-80 1/8th inch spokes holding 100+ whp?? I wouldn't.
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Old 03-24-2009, 11:05 PM   #9
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Quote:
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One reason. Horsepower and torque.
That's two reasons, Steve. Horsepower and torque aren't the same thing.
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Old 03-24-2009, 11:05 PM   #10
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I think we need to do a demo on a dyno. this could be interesting

Harleys run em... 103 cu.in. motors and up.... but Harley_Ryder also had his wheels bent and spokes loosened by someone installing a tire on his once. Now he goes to HD for all the work on the bike.
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Old 03-25-2009, 12:27 AM   #11
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1. speed.
2. weight
3. looks
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Old 03-25-2009, 11:57 AM   #12
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Quote:
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That's two reasons, Steve. Horsepower and torque aren't the same thing.

Not to be a smart (especially with only 3 posts!), but horsepower and torque are more closely related than you'd think. One is derived from the other. Horsepower is an arbitrary number that is actually just a multiple of torque. Without that torque figure, which is what is actually being measured, there'd be no horsepower.
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Old 03-25-2009, 12:17 PM   #13
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Quote:
Originally Posted by bkeros View Post
Not to be a smart (especially with only 3 posts!), but horsepower and torque are more closely related than you'd think. One is derived from the other. Horsepower is an arbitrary number that is actually just a multiple of torque. Without that torque figure, which is what is actually being measured, there'd be no horsepower.
Not than I'd think. I'm an ME, so I get it.


Oh, and by the way, I'm cool with you being a smart with only three posts. It's others that have a post count problem.
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Old 03-25-2009, 07:28 PM   #14
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Not than I'd think. I'm an ME, so I get it.


Oh, and by the way, I'm cool with you being a smart with only three posts. It's others that have a post count problem.
Ok, fair enough...as a ME I'm sure you get it! I'm also sure that maybe, just maybe, there might be some more smart- comments coming from this general direction (what..here? On the MH forum? Say it ain't so!)!
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Old 03-25-2009, 09:53 PM   #15
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i think its the way pounding is delivered on each.
for instance on a dirt bike,the greater force is just about always from jumps and on the turns the bike is almost on its side riding on a berm.
on a sportbike there is no jumps(idially).but the wheels take alot of of lateral force,specially from bigger guys like myself when hard on the gas in a turn.me thinks........
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Old 03-25-2009, 10:10 PM   #16
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Ok, fair enough...as a ME I'm sure you get it! I'm also sure that maybe, just maybe, there might be some more smart- comments coming from this general direction (what..here? On the MH forum? Say it ain't so!)!
You're going to fit in nicely around here.
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Old 03-25-2009, 10:17 PM   #17
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i think he means more like why dont dirt bikes have tubeless mag wheels.

p.s. i think this guy is the owner of houstonmotocross. lol if so i used to race this guy weekly haha
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Old 03-25-2009, 11:28 PM   #18
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You're going to fit in nicely around here.
yeah....I's got lots of practice on some other boards...and being the middle of 5 kids!
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