Fly have stepped up to a whole new level with their 2018 bike range. Great value & great quality.
The Proton is one of our best selling mid-range bikes aimed at the all around rider, taller riders or simply riders that like bigger and more stable bikes.
A long 21" toptube, 13.2" rear end, big 8.75" bars and stable 30mm offset forks all make for a bike thats comfortable in all riding situations.
The Proton is a high end bike at a mid range price. Full chromoly & sealed bearings throughout. Spec highlights include the clean "no pinch" clamp design Trebol 3 crankset & Bueno female front hub.
For the 2018 range, the Proton features the new Trebol tyres, Proton Tripod seat & Trebol HS pegs.

  • Frame - Full 4130 Chromoly / Removable Brakemounts & Guides
  • Fork - Full 4130 Chromoly
  • Bars - Full 4130 Chromoly
  • Grips - Fly Devon / Fly barends
  • Stem - Trebol 6061 alloy Topload
  • Headset - Sealed Integrated
  • Lever - Fly Manual
  • Brakes - Fly Manual Springhanger U-Brake
  • Cranks - Trebol 3 Tubular Chromoly 3pc 175mm
  • BB - Mid sealed bearing
  • Pedals - Ruben Graphite
  • Chain - 410 type
  • Sprocket - Trebol 25T Alloy
  • Driver - 9T sealed bearing (RHD)
  • Front Hub - Trebol Bueno female alloy sealed 10mm
  • Rear Hub - Trebol Alloy cassette sealed bearing 14mm
  • Front Rim - Trebol alloy 20" Double Wall 36H
  • Rear Rim - Trebol alloy 20" Double Wall 36H
  • Seat - Fly Proton Tripod Seat/Trebol Tripod Seatpost
  • Seat Clamp - Integrated
  • Tyres - Trebol 20 x 2.35"/2.35"
  • Pegs - Trebol HS (1 pair)

Frame Geometry
Top Tube Length: 21"
Chain Stay Length: 13.2"
Head Tube Angle: 75°
Seat Tube Angle: 71°
Bottom Bracket Height: 11.75"
Standover Height: 9"

Bar Geometry
Rise: 8.75"
Width: 29"

(BK18FLYPRTFBLK21)

SKU BK18FLYPRTFBLK21
Brand FLY BIKES
Shipping Weight 18.0000kg
Shipping Width 1.000m
Shipping Height 0.250m
Shipping Length 0.600m
Shipping Cubic 0.150000m3

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