Sunday: BMX Frame Innovation and the Choice Between Street and Flow

Sunday is a BMX bicycle and component brand whose range stretches from smaller starter bikes to rider-signature completes and aftermarket frames. Its distinctive story connects frame construction with different ways of riding: technical street moves, flowing transitions and larger-wheel BMX. The Sunday Bikes website brings those products together with team videos and rider bike checks.

A history built through BMX components

Sunday’s manufacturer history starts in 2005 with Triumph handlebars and Morning forks using the 41 Thermal heat-treatment process. Its first frame followed in May 2006. In 2007, the First Wave introduced a shaped down tube intended to improve stiffness and resistance to denting. That sequence gives the brand a concrete engineering background: components came first, followed by successive frame developments.

The Soundwave arrived in 2012 as a further development of the Wave series. That lineage remains visible in the Soundwave v3 frame, which combines Wave top and down tubes, hollow dropouts, integrated chain tensioners and post-weld heat treatment. For someone building a custom BMX, these are specific construction details to compare alongside geometry and fit.

Choose the riding focus before the colour

Sunday’s complete-bike range makes the differences between riding styles particularly clear. Jake Seeley’s Street Sweeper uses a short rear end and higher bottom bracket for technical street riding. Gary Young’s Wavelength takes another direction: Sunday describes its longer rear end as suited to stability, speed, transitions and trails. These models provide a useful comparison between a compact street setup and a layout aimed at flowing through bigger features.

Starting out or choosing larger wheels

The Blueprint is Sunday’s entry-level 20-inch option, with several top-tube lengths listed. That distinction matters when comparing fit: sharing a wheel diameter does not mean every version has the same frame dimensions.

For smaller riders, the Primer starter family includes 14-, 16- and 18-inch wheel options. The Model C brings a 24-inch wheel format with geometry inspired by 20-inch BMX, while the High C extends the range to 29-inch wheels. These choices make wheel size a separate decision from component level.

Start with the terrain and movements you want to practise, then compare frame dimensions and the exact build. Explore the Sunday bikes guide with those priorities in mind.