Double butted tubes are thicker at both ends, the downtube for example where additional strength is required at the bottom bracket junction and headtube. Triple butted tubes serve the same purpose as double butted tubes but further reduce weight in the center.
What is double butted tube?
The most common type is “double-butted” tubing, which is possible for all of our stock alloy materials. These particular tubes have thicker walls at each end for strength purposes at joints. The mid-section is thinner for weight savings but also help dissipate stress arising from the heavier ends or butts.
What is butting in bike frames?
We generally start the butting process with tubes with wall thicknesses of less than 1mm, and begin working away areas of unneeded thickness. This custom butting process allows us to increase the tube diameters on our frames for increased stiffness, while reducing weight compared to a straight walled tube.
What is double butted alloy?
Double-butted – The tubes are thicker at each end to provide additional strength at the junctions but thinner in the middle to save weight. The down tube is most commonly double-butted. Triple butted – Tubes will have 3 different wall thicknesses.
What’s the difference between double butted and triple butted aluminum?
Double butted is when both ends have thicker walls and the middle has thinner. Triple butted is the same as double butted but the material removal is taken a stage further to make the walls in the middle even thinner.
What is triple butted frame?
For example, triple butted means the tube, usually of an aluminum alloy, has three different thicknesses, with the thicker sections at the end where they are welded. The same material can be used in handlebars.
What are double butted spokes?
Butted spokes have at least two distinct diameters: single-butted (SB) spokes are larger at the elbow and smaller along the rest of their length, while double-butted (DB) spokes are larger at the elbow and the thread and smaller in the middle section.
What is triple butted bike frame?
What is butting on a bike frame?
To reduce weight and improve overall performance, skilled bicycle manufacturers often choose to butt the bicycle’s tubing in the frame. Butting is the process of removing extra material from where it is not needed.
What is a triple butted frame?
Finally, if tubes have three different wall thicknesses along their length, then then frame is described as being triple butted. This technology is successfully applied to reduce the amount of material used for a frame, decreasing its weight by 15%.
What is a butted wall frame?
The term butted refers to the thickness of tube wall. If tubes have only one dimension along them, we refer to the frame as being butted, if it they have two dimensions (being thicker at the tube ends and thinner along the middle) then we are talking about double butted frames.
What is the difference between double and triple butting?
Double Butting —As the tube is shaped, extra material is allowed internally at each end of the tube. By increasing these areas of the tube, the overall tube wall thickness can be reduced, thus saving weight. Triple Butting —To save even more weight, the double butting process is refined by stepping down the material at the ends of the tube.
