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Bike Of The Day: 2024 Rumblefish CS OS20 Pro XL BMX Race Bike

Rumblefish OS20 BMX Racing Bike

Today’s Bike Of The Day is another nice Rumblefish CS submitted by Richard Kerr!! This time it’s a OS20 Pro XL build and I’m loving it! This disc only chromoly frame is ready for the track with it’s low profile stance. Can’t go wrong with that orange and blue color scheme with black, chrome and polish to complete the look. This is actually Richards first OS20 design and build and I think it came out amazing! Be sure to give it a rating via the sliders below for the Bike Of The Month and 2024 Bike Of The Year charts

I have for you today my latest build. It’s a Rumblefish CS Pro XL OS20. I wanted a new school bike so I built up this frame and fork. I wanted some old school vibe with new school tech. I used Chromoly shaped tubing through out. Every time I build a new frame and fork I always do something different, to learn a new skill.


On this build I went with a tapered head tube and steer tube on the fork. 1 1/8”-1 1/2”. Also this is my first OS20 build. The jig I use is pretty basic, no built in angle gages or measurements. So when I build a frame I have a l base setting I use for a starting point and I make adjustments from there. Like head tube angle, seat tube angle, top tube ect. Whatever the build calls for. This being my first OS20 I had no base setting so I started from my 20” pro base and I had to add a little SWAG (Scientific wild a** guess). As with most my build I use a little SWAG but on this one I used more than usual.


My favorite day with a new build is the day I get it all done and built up and take for a ride. After all that’s reason why we do all the work in the first place. To ride.
The bike turned out really good and rides better then I hoped. ~Richard Kerr/Rumblefish

Parts List:

  • Frame: Rumblefish CS OS20 Pro XL
  • Fork: Rumblefish CS OS20 tapered 1 1/8-1 1/2”
  • Stem: Elevn
  • Cranks: euro mnt bike
  • Pedals: Hope
  • Hubs: Profile
  • Handlebars: SE Racing
  • Grips: Answer
  • Brakes: Hope
  • Seat Clamp: Hope
  • Seat: Prologo
  • Seatpost: Sinz
  • Rims: Alienation
  • Tires: Tioga power block
  • Geo.
  • 21” tt
  • 74 1/2* and chain stay 15 1/4-16 1/2.
  • Seat tube 72*
  • BB 11 1/4”
  • Wheel base 38 1/4 – 40 in.

Rate This Bike:

  • !!In an effort to keep the ratings more fair, Every featured Bike Of The Day starts with a rating of 5 in each criteria.
  • NEW FOR 2024!!! Users will have to login to make a rating.

If you would like to get your bike featured as Bike Of The Day. CLICK HERE for all the submission information

2024 Rumblefish OS20 Pro XL
{{ reviewsOverall }} / 10 Users (2 rated)
Color6.86
Originality7.05
Parts6.76
Overall Style7.1
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