Pipes for bicycle frames are made of

Solution (By Examveda Team)

The correct answer is A: Cold rolled steel.
Let's break down why:

Cold rolled steel: This type of steel is processed at room temperature after hot rolling. This process increases its strength, improves its surface finish, and makes it more dimensionally accurate. These are all important properties for bicycle frames, which need to be strong, lightweight, and have a smooth finish for welding and painting.

Hot rolled steel: This steel is processed at high temperatures. While it's cheaper to produce, it's not as strong or dimensionally accurate as cold-rolled steel. Its surface finish is also rougher, making it less suitable for bicycle frames.

Forged steel: Forging involves shaping steel using compressive forces. While forging can produce very strong parts, it's more commonly used for components like crankshafts or connecting rods that need to withstand extreme stress, not entire frame tubing.

Cast steel: Casting involves pouring molten steel into a mold. Cast steel can be used to make complex shapes, but it generally has lower strength and ductility compared to wrought steels (like rolled or forged steel). It is rarely used for bicycle frames due to its weight and potential for porosity.

In Summary: Bicycle frames need a strong, lightweight material with a good surface finish. Cold rolled steel provides the best balance of these properties, making it the ideal choice for bicycle frame tubing.