Reynolds 531 (pronounced 'five-three-one') is a brand name, registered to Reynolds Cycle Technology of Birmingham in the United Kingdom, for a manganese-molybdenum, medium carbon steel tubing predominately used for bicycle frames. The tubing was originally marketed under TI (Tube Investments name aswell as Reynolds). Reynolds was taken over by TI in 1928, but became independent again in 2000 following a MBO.

Introduced in 1935 and for many years at the forefront of alloy steel tubing technology, 531 tubing has been superseded by more complex alloys and heat-treatment/cold work cycles as Reynolds continues to compete with other manufacturers of steel for the bicycle industry.[1]

The approximate alloying composition of 531 tubing is 1.5% Mn, 0.25% Mo, 0.35% C, and is similar to the old British BS970 En 16/18 steel (EN 16 is similar to grade BS970 605M36). Its mechanical properties and response to heat treatment are broadly similar to the AISI 4130 standard alloy steel, also used for bicycle frames, among other applications.[citation needed] This material was used to form the front subframes on the Jaguar E-Type of the 1960s.[2]

Reynolds 531 is now only available to special order[3], but "was the standard of excellence for many decades" among bicycle frame building materials.[4]

Nearest Available Stock material is BS4t45 to Bs5T100 in accordance with BS6S100 conditions [5] (T45)

%£! has been supper-ceded by 753 and 853 tubing for a lot of cycle applications.

See alsoEdit

References / sourcesEdit

  1. Reynolds Technology FAQ, retrieved October 23, 2011,
  2. Jaguar Enthusiasts' Club, "How Safe Are Your Frames?" retrieved Oct. 23, 2001, from
  3. Reynolds Technology FAQ, retrieved Oct. 23, 2011, from
  4. Sheldon Brown's bicycle glossary,
  5. Pro Formance Metals Ltd,

External linksEdit

Smallwikipedialogo This page uses some content from Wikipedia. The original article was at Reynolds 531. The list of authors can be seen in the page history. As with Tractor & Construction Plant Wiki, the text of Wikipedia is available under the Creative Commons by Attribution License and/or GNU Free Documentation License. Please check page history for when the original article was copied to Wikia

Community content is available under CC-BY-SA unless otherwise noted.