Using an industry standard alloy with mechanical properties similar to our famous 753 brand, Reynolds mandrel butt and heat-treat this alloy so that thinner walls can be used compared to non-heat-treated steels. 725 can be TIG welded and used within our “Designer Select” combinations including 853 and 631 tubes.

Why it works:

UTS: 1080-1280 MPa, density 7.78gm/cc

Based on a 0.3% carbon steel alloy which has been heat-treated and back-tempered for increased ductility. The chromium content promotes hardenability and resistance to oxidation. The molybdenum works in conjunction with the chrome to stabilize the alloy and maintain strength after heat-treatment and when in use.

How you would use it:

Reynolds 725 is a heat-treaded version for 525. This produces a stronger steel and allows designers to build either a stronger frame or to reduce wall thicknesses and take weight out of the frame.
This provides a good basis for mountain and gravel bikes where toughness and robustness are key factors in material selection.

Learn More

Click here to download a metal alloys comparison (extract) PDF for designers.