Sunday Park Ranger Frame

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  • The Park Ranger is designed specifically for technical park, transition and street riding.

    This frame design draws inspiration from the Street Sweeper and makes use of its tube set and short chain stays to help create a tech driven frame with a steep head tube angle, a tall bottom bracket, hollow dropouts with integrated chain tensioners and a significantly lower standover.

    The Park Ranger includes all of the necessary (and fully removable) braking and Gyro tab hardware that park and transition riders look for when building a new bike. The frame's front triangle makes use of traditional round Nightshift-style top and down tubes with proven internal gusseting for added strength.

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Product Specs
  1. MATERIAL: 100% 4130 Chromoly
  2. HEAD TUBE ANGLE: 75.25°
  3. SEAT TUBE ANGLE: 71°
  4. CHAIN STAY LENGTH: 12.70-13"
  5. BB HEIGHT: 11.625°
  6. WHEEL SIZE: 20°
  7. STANDOVER HEIGHT: 7.625°
  8. DROPOUT SIZE: 14mm
  9. HEADSET TYPE: Integrated
  10. BB TYPE: Mid
  11. BRAKE MOUNTS: Removable
  12. GYRO TABS: Removable
  13. WEIGHT: 5 lbs

Product Highlights
  • Responsive Geometry with Short Backend and Steep Headtube
  • Best suited to Street and Park riding
  • Double-butted, top and down tubes with proven internal gusseting.
  • Hollow 8mm wide dropouts are as light as a solid 5mm dropout, but over twice as strong. There is a small internal chain tensioner to hold the wheel in position and to simplify wheel removal.
  • Proven, removable, brake mounts and cable guides/stops work flawlessly when installed and allow for a sleek overall look when they're not.

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.

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