The cost of a mountain bike frame is proportionate to
its material, as well as the treatment that material
has received. Currently, there are five types of
material used in mountain bikes - high tensile steel,
chromoly steel, aluminum, titanium, and carbon
fiber. Oversized diameters, heat treating, and butting are
tubing material treatments that will increase the
cost of a frame as well.
High tensile steel
This is a very durable alloy that's found in lower
priced mountain bikes. It offers a high carbon content
which makes it less stiff than chromoly steel, so
more materials are needed to make it stiff enough for
bicycle frames, which will in turn make it that much
heavier.
Relatively inexpensive to produce, you'll find this
material in trail bikes, city bikes, and even entry
level mountain bikes. There are some bikes that come
with a chromoly seat tube, while the rest is high
tensile steel.
Chromoly steel
Short for steel alloy, chromoly is best described by
its major additives - chromium and molybdenum. This
is probably the most refined framing material, giving
over 100 years of dependable service.
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