polartrekker said:
I heard from a friend (an ex-BMXer....pee wee league) that CroMoly frames were the best bang for your buck when it comes to strength and price. Seems like most bikes are aluminum or some blend of aluminum and titanium. Anyone have any thoughts on this?
Maybe for a BMX bike or a jumping one where you would prefer it to bend before it breaks.
Steel is/was too flexy for suspension MTB's and for some areas like the BB. You need to add more steel to the area to make it less flexy but then your weight goes up. Aluminum does this job better.
Steel is more difficult to manipulate than Aluminum as the presses, matresses and stuff used to shape it requires to be of a greater capacity as steel is more resistant than Al and requires higher temperatures at all processes (like welding, treating, etc).
That's why Al gives the bang-for-the-buck on the gross of MTB's today.
As for which is "better" is like asking if you prefer Mercedes or Ferraris....