S&M Whammo Frame

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  • Craig Passero’s new signature Whammo frame from S&M. This frame is made from tough butted true temper supertherm chromoly tubing.

    With a 75.25° head tube angle, 71° seat tube angle, 11.8″ bottom bracket height, 8.75″ standover height and 13.3″ chain stay length you get super responsive geometry.

    Gussets on the top and down tubes keep this frame nice and rigid, 14mm 4Q-baked heat-treated drop outs provide strength at the rear end and comes with removable brake mounts on the seat stay (hardware not included).

    The Whammo is available in top tube lengths of 20″, 20.5″, 20.75″ and 21″.

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Product Specs
  1. MATERIAL: Full 4130 Chromoly
  2. HEAD TUBE ANGLE: 75.25°
  3. SEAT TUBE ANGLE: 71°
  4. CHAIN STAY LENGTH: 13.3"
  5. BB HEIGHT: 11.8"
  6. WHEEL SIZE: 20"
  7. STANDOVER HEIGHT: 8.75"
  8. DROPOUT SIZE: 14mm
  9. HEADSET TYPE: Integrated
  10. BB TYPE: Mid
  11. BRAKE MOUNTS: Removable
  12. GYRO TABS: None
  13. WEIGHT: 4.65lbs

Product Highlights
  • Responsive Geometry with Short Backend and Steep Headtube
  • Best suited to Street and Park riding
  • Top Tube and Downtube gussets for added strength
  • 14mm heat-treated drop outs
  • Made in the USA

NEED SOME HELP UNDERSTANDING FRAME GEOMETRY?

bmx frame geometry can look daunting but thanks to our handy guide below you will have it figured out in no time, and remember we're all bmxers here, so if you have any questions just ask.

Frame Size Chart


Frame Sizing is very much a personal preference, some riders like them longer, others shorter - here's a rough guide - if you have any questions remember we are here to help! 

3ft - 4ft - best suited to a 16" or 18" wheeled bike
4ft - 5ft - 18" to 20" top tube
5ft - 5ft 4" -
20" to 20.25" top tube
5ft 4" - 5ft 8" -
20.25" to 21" top tube
5ft 8" - 6ft -
21" to 21.25" top tube
6ft Plus -
21" top tube or longer

Frame Geometry

Frame Geometry can take a bit of understanding - but here at SourceBMX we are here to help! The first thing to understand is that BMX frame Sizing is best measured by the length of the Top Tube - shown here as TT. Keep reading on to understand how the angles change how your frame will feel and check out our sizing chart below! 

Headtube Angle (HT)

Head tube angle determines the angle of your forks. A steeper HT (i.e 75°and higher) will make the bike turn quicker than a mellower angle (i.e 74.5 and lower°). The more responsive the frame, the more twitchy it will feel, especially at highspeed!

Chain Stay Length (CS)

The chain stay is essentially the length of the rear end of the bike. A shorter CS length will make the bike more responsive and a longer one more stable. As a rough guide a 13.5" long chain stay is about average.

Seat Tube Angle (ST)

Seat tube angles don’t vary too much (around 71°) and affect the centre of gravity. The steeper the angle the shorter your bike will feel. Some frames have a mellower seat tube angle (example 69˚) which makes for a longer frame without actually being longer and reduces how fast your frame turns.

Stand Over Height (SO)

Standover height is essentially how high your frame is. A frame with a low standover height is more responsive and easier to ‘throw around’ whilst a high SO height is more stable; particularly useful when going fast.

HALF PRICE HEADSET AND BB WITH FRAMES