Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    Retired Member ultra-g's Avatar
    Join Date
    Feb 2004
    Location
    Queens New York
    My Bikes
    Bianchi Pisa, LeMond Poprad
    Posts
    1,181
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sorry, meant to post this in the road cycling forum

    I know there are different types of aluminum and steel, but in general, which is stronger?

    I'm about 215 lbs. now, but hope to be 190 lbs. by the end of September (through lots of bicycling... I was 240 lbs. when I started this winter).

    When I get my next road bike I'm going to get either aluminum or steel, but still am not sure which I should go with. I want something that will be strong and fast, mainly for exercise. I'm definitely not planning on entering races, but I might do some centuries once I drop some more weight.

    Are the steel frame Bianchis good bikes (like the Veloce, Eros)... how about the Specialized Allez Cr-Mo? Or should I stick with a something like the Allez Comp with the double-butted aluminum frame?
    I Changed My User Name!

  2. #2
    Industry Maven Thylacine's Avatar
    Join Date
    Oct 2003
    Location
    Wherever good bikes are sold
    My Bikes
    Thylacines...only Thylacines.
    Posts
    2,936
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    'Strength' is a design issue, not a materials issue. Generally, any material can be designed as a structure to be 'strong'.

    I prefer steel and titanium because they're natural springs and have a resiliant ride feel 'zing' that I like the feel of, and have an infinite fatigue life if cycled under their fatigue limit. Also, I like the aesthetics of them both, being slightly smaller diameter tubes, slightly more traditional looking I guess.

    Aluminium and CF are just easier to make and easier to market - that's the only reason they're more prevalent in the market.
    Have you earned your stripes? <<click here / Questions about custom frames? Chat me! - warwickg71 (AIM/iChat) ThylacineCycles (Skype)

  3. #3
    I couldn't car less. jeff williams's Avatar
    Join Date
    Nov 2003
    My Bikes
    Ritchey P-series prototype, Diamondback, Nishiki Triathelon Pro.
    Posts
    4,404
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Generally, chromoly steel is 'stronger'.
    BUT....steel is strong and flexy, this tensile strenght lasts for a long time\ doesn't damage the molecular grain.
    For a more ridged strong frame, oversize Alu tubes ( big steel gets heavy ) BUT, this bike will ride hard, and if you bang a tube\ sucking wound ( steel, you got a ding ). Also constant flex in Alu developes micro fractures or a kind of crystalization\ shorter life span.

    A guy with real mass, I'd go oversize Alu, me personally, I prefer steel. Or Ti if I could afford.

    Oh ****. I should always start my posts 'I ride mtbs only.' Road bikes, I really don't have experience\ informed opinion.

  4. #4
    I bet
    Join Date
    Dec 2003
    Posts
    1,033
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I weigh 190 and i was 200 6 months ago. Most bikes can handle that weight but you might want to go with 700x25 or bigger tires, imho.

  5. #5
    Senior Member RacerX's Avatar
    Join Date
    Feb 2002
    Location
    Left Coast
    Posts
    1,717
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ultra-g
    Sorry, meant to post this in the road cycling forum

    I know there are different types of aluminum and steel, but in general, which is stronger?
    I can answer that by asking you which weighs more: a pound of feathers or a pound of steel.

  6. #6
    Retired Member ultra-g's Avatar
    Join Date
    Feb 2004
    Location
    Queens New York
    My Bikes
    Bianchi Pisa, LeMond Poprad
    Posts
    1,181
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by RacerX
    I can answer that by asking you which weighs more: a pound of feathers or a pound of steel.

    Are they making frames out of feathers now?
    I Changed My User Name!

  7. #7
    Senior Member UNCLECHET's Avatar
    Join Date
    Mar 2004
    Location
    Wichita, Ks
    My Bikes
    a bunch
    Posts
    142
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Steel is stronger. Aluminum weighs 1/3 that of steel. It also takes three times as much to get the same strength. Does that help?

  8. #8
    quien es mas macho? BlindRobert's Avatar
    Join Date
    Jun 2004
    Posts
    335
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ultra-g
    I know there are different types of aluminum and steel, but in general, which is stronger?
    Steel is much much stronger than aluminum. The modulus of elasticity (a measure of stiffness: 29,000,000 psi for steel and about 10,300,000 psi for aluminum) and the yield point (stress at which a material will deform and not return to its original shape) of steel are far greater than aluminum.

    That being said, at your weight you should be able to find a sufficiently stiff and "strong" frame made out of either material. Test ride, test ride, test ride.

  9. #9
    NOT a weight weenie Hunter's Avatar
    Join Date
    Dec 2000
    Posts
    1,762
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    BlindRobert,
    The numbers you gave are not accurate for all steel or aluminum. Since steel and aluminum can be and is alloyed in thousands of ways the KSI, modulus, yield strength, and elasticity will vary from product to product.

  10. #10
    quien es mas macho? BlindRobert's Avatar
    Join Date
    Jun 2004
    Posts
    335
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hunter
    BlindRobert,
    The numbers you gave are not accurate for all steel or aluminum. Since steel and aluminum can be and is alloyed in thousands of ways the KSI, modulus, yield strength, and elasticity will vary from product to product.
    Actually, the modulus of elasticity of steel is pretty much the same for all alloys because the metals that it is alloyed with are added in minute quantities, aluminum varies more because the alloyed metals are added in proportionately larger quantitiues...which is why I said the modulus of elasticity for aluminum is "ABOUT" 10,300,000 psi.

  11. #11
    Senior Member dabern's Avatar
    Join Date
    Mar 2004
    Location
    Asheville, NC
    My Bikes
    Rock Lobster track, Colnago Dream, Ti Paramount, Litespeed Vortex compact, Santa Cruz Blur, Bianchi cyclocross...always wanting more...
    Posts
    334
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The horse is close to death but still breathing, so will post this link from the man hizzownself, Sheldon.

    http://www.sheldonbrown.com/frame-materials.html
    Rock Lobster

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •