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Discussion Starter #1 (Edited)
I'm putting together a list of modifications for the new Honda 600RR I'm getting this Spring. One of the mods will be carbon fiber or magnesium racing wheels, but I'm not sure which one to go with. The question is, which is better???

I'm leaning toward the Marchesini wheels because of their reputation and selection. If somebody's got an opinion, information, or experience with carbon fiber and/or magnesium wheels please throw in your 2 cents!

Thanks.
 

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It depends on where the bike will be ridden...if there are alot of potholes I would stay away from full carbon rims. Carbon does not flex enough to take the hit of a pothole..and you will break them. There are a line of rims (not sure by who) that have carbon inners and aluminum outers, they bolt together. I would go for them...they look sweet and are light as hell. If it were my money, that is how I would do it, but just remember....carbon is pretty brittle, mag is a little less brittle, stockers are good....
 

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Discussion Starter #6
Judge said:
It depends on where the bike will be ridden...if there are alot of potholes I would stay away from full carbon rims. Carbon does not flex enough to take the hit of a pothole..and you will break them. There are a line of rims (not sure by who) that have carbon inners and aluminum outers, they bolt together. I would go for them...they look sweet and are light as hell. If it were my money, that is how I would do it, but just remember....carbon is pretty brittle, mag is a little less brittle, stockers are good....

You hit it on the head. The condition of the roads on the east coast is my biggest concern. The potholes in New York can swallow a car whole!

On a scale of 1 to 10, 10 being the strength of a stock wheel, what would you rate a magnesium wheel and a carbon wheel?
 

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Carbon fibre is 50% lighter than Magnesium and 30% stronger. The advantage of the carbon rims is that they reduce the rotating mass of the wheel at the rim. The Magnesium wheels reduce the mass at the center by making the spokes really thin. Can you tell the difference? Probably not, but in theory if you can reduce the mass of the wheel at the rim it should improve handling. I have carbon rims and have had no issues in 16,000 miles of street riding. Although Florida doesn't have the truck swallowing potholes of New York City I have hit constuction realetd obstacles (how about a 4 inch high wall where they sawed out a section of highway for a new pipe) without damage, and my bike is a heavy machine. I have seen many of the stock alumimum wheels with dented rims or even chunks taken out from road hazards.
 

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Discussion Starter #8
Blink said:
Carbon fibre is 50% lighter than Magnesium and 30% stronger. The advantage of the carbon rims is that they reduce the rotating mass of the wheel at the rim. The Magnesium wheels reduce the mass at the center by making the spokes really thin. Can you tell the difference? Probably not, but in theory if you can reduce the mass of the wheel at the rim it should improve handling. I have carbon rims and have had no issues in 16,000 miles of street riding. Although Florida doesn't have the truck swallowing potholes of New York City I have hit constuction realetd obstacles (how about a 4 inch high wall where they sawed out a section of highway for a new pipe) without damage, and my bike is a heavy machine. I have seen many of the stock alumimum wheels with dented rims or even chunks taken out from road hazards.
Blink,
Thanks for the great info. I've been a little concerned about the real-world strength of carbon fiber and didn't want to drop a couple grand into a pothole! I'm curious though, how fast were you going when you hit the 4" high "wall?"
 

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4 inch high wall?! Dammit that makes me mad! We motorcyclists pay the same damn registration tax as vehicles that actually wear down the roads (whereas we don't), and we don't even get enough consideration that they would warn us about shyt like that?! [email protected]@in' A! Well if carbon fibre survived that, that looks like the vote of confidence. Myself, if I had loads of money I would get those rims, but I can think of about a hundred other mods that would be more cost effective for me, before I'd do that. Just think, total öhlins suspension, just for instance!

Ciao, from TURIN ITALY!
 

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Discussion Starter #11
oldgixer said:
Double Ditto!

The wheels will happen once the exhaust, suspension, race plastics, battery replacement, yadda yadda yadda, etc gets completed. I'm gonna go for the biggest "bang-for-the-buck" modifications first.
 

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Alright, CF or Mags. True mag wheels are going to be about the same weight as alum. maybe a little lighter. CF is going to be lighter, a good bit. Mags are going to be stronger than your alum and much stronger than CF. Thats the impressive thing about Magnesium, its as light as alum but almost as strong as steel.

Tough call, This is completely according to where your riding. Mostly street, go for the Mags, they will last for ever, unless you catch them on fire, if that happens I want picks. If your on the track go for the CF's.
 

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wheel thing

Both materials have durability concerns that are tolerated in race life, but, become a bit of a question for street life (especially if the street is in New York City), have you checked with Performance Machine, for the Titanium wheels? Nothing is more indestruct city than Titanium.
 

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I would shy away from CF on the street, especially in the NE with big and frequent potholes. Problem in my opinion is that when CF fails it FAILS BIG and you could have an instantaneous and complete flat or worse. CF is strong as hell but not able to bend so if a sufficient force is applied it could crack big. If it cracks big at speed the centripital (sp) force can pull it completely apart.


There was a death at the IoM TT a couple years back (on the Britten I think) when a CF wheel just disintegrated from failure at high speed. (this was also early in the development of CF wheels so ?????)


And if you crack it at slow speed without failure but then later run up to high speed it could fail then when there had been little or no visual evidence of the previous damage.


On the other hand if Magnesium takes a hit it will bend and at least you'll know it was damaged. That would be my biggest problem with CF, it could crack but have no outward signs of damage???


I say Magnesium for the street.

:2cents:
 

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you can base your decision on this also though.
if your wheels were to catch fire you would be able to put out the CF rims but not the Mag rims.....due to that Magnesium burns so hot that it would split the water molocules into Hydrogen and Oxygen causing the water to act light a catalyst to the fire.
this would be an extremely unprobable scenario but i wanted to let you know it could happen :D
 

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"unless you catch them on fire, if that happens I want picks"

whenever i hear about Mag wheels i think of that...although i remember when it seemed even if the wheels were aluminum you still called em mag's:rolleyes:

i would highly doubt motor cycle mags would catch on fire though because the brake is not as encased as in a car and would allow for alot better heat dissipation...in theory anyway:rolleyes:

or am i a complete imbicile :squid:
 

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i completely agree with you.....the air cools the rotors off enough so your bike doesnt flame more than richard simmons :D

yeah in chemistry class we set Mg on fire it was pretty awesone....its amazing how it can still burn in a Pure CO2 enviorment......also i would like to point out the Oxygen isnt flammable it only supports combustion......i say this because in the movie final destination 2 or 3 or whatever they try to make as if O2 explodes?????? :wtf: that is f-ing impossible for O2 to combust.....plus why they hell would you have anything flamable floating aroung in triage???
 

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Magnesium will not catch on fire unless it is small chips or a dust (being in a form that allows the most amount of oxygen to enter into the atomic structure) and then high heat applied. I don't think this is a problem for you.

Magnesium is the lightest engineering metal (excluding exotic metals like beryllium and lithium). As a pure metal it is very weak, so all engineered magnesium products are alloys with about 10% aluminum and 1% zinc.

For hitting potholes; the modulus of elasticity (stiffness) of magnesium alloys is 6.5 million PSI, carbon-fibers can exceed 100 million PSI ( but it won't indicate any bending of flexing if this is exceeded, it will shatter), aluminum is 10 million PSI, but's it's heavier than both mag and CF.

***Audiosolstice- please correct me, but I thought that one of the first manned missions to space, NASA used pure oxygen for the astronauts to breathe, which later combusted and blew the thing out of the sky

good luck
 

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Hi All-

Carbon Fiber is too brittle for street use and carries the risk of catastrophic failure that you wouldn't experience with a metal rim. If it ain't for track-use-only I would say stick with Magnesium or the stockers.

~ Blue Jays ~
 
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