Gt Bump BMX Bike 20in

Priced: $251.83 - $399.99
Gt Bump BMX Bike 20in
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Available Colors:
REI (2013) $251.83
21% off
Regularly: $318.93
The House $289.95
9% off
Regularly: $318.93 $399.99
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Gt Bump BMX Bike 20in -

The GT Bump BMX Bike is a BMX bicycle made for dirt trails and the fun of jumping dirt piles all day. Add a set of pegs, and it'll please you on the streets as well, and give you all the fun you crave having. Its strong chromoly frame is built to take a beating and its Tektro XL320 alloy brakes won't let you down when it's time to stop. Whether you're a beginner or a long-time rider, the GT Bump BMX bike will keep up with you, and your fun.


  • GT Dirt Design Frame with Cr-Mo Main Tubes (H/T, T/T, D/T) and CrMo Steerer Fork and Fully removable Brake hardware


  • Head tube, top tube and down tube of frame use chromoly tubing for strong, stiff performance to stand up to hard riding; down tube gusset adds strength at a critical point


  • Taller Hanlderbar Size

Traction and Grip:

  • GT Bump 20 in BMX bike has grippy GT Sandbox Dirt Tread tires to deliver confident traction, from walls to jump lips


  • 25x9 gearing with a Fully sealed bearing cassette
  • 3-piece chromoly crankset drives a 25-tooth chain ring to a 9-tooth cog for fast spin-ups
  • GT Top Load inverted design stem
  • GT Tubular Cr-Mo 3Pc Crmo cranks with Sealed Mid BB
  • Integrated headset with sealed bearings and mid BB both offer tough, smooth-spinning performance
  • Single seatstay-mounted rear U-brake offers a low profile
  • Tough wheels are built with 36-hole rear and 32-hole front Alienation Black Sheep rims, which are laced to hubs with sealed bearings for lasting performance
REI (2013)

Nimble and tough, the GT Bump 20 in. BMX bike is well-suited to the trails, offering a fun, smooth and confident ride run after run on those all-day flow sessions.

All bicycles sold at REI include a free warranty tune-up. New bikes go through a normal break-in period, after which readjustment is important for longevity and performance. Bring your new bike in to your local REI for its free tune-up within 20 hours of use or 6 months from purchase, whichever comes first. Contact your nearest REI bike shop to schedule this important service.


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Bike frame material:Steel
Bike style:BMX bike
Bike suspension:No suspension
Bike weight:How we measure bike weight
Bottom Bracket:Mid Sealed Bearing
Brake:Tektro FX340R, Aluminum U-Brake
Brake levers:Tektro XL320
Brake type:Rim brake
Brakes:Tektro FX340R
Chain:KMC Z410
Colors:BLU, BBQ
Crank:GT Tubular Cr-Mo 3Pc., 175mm Arms, Cold Forged Cr-Mo 19mm x 8T Spline Spindle, 5mm 25T GT AL Chain Wheel
Crankset:GT Cro-Mo 3 Pcs, 8T, 175mm 25T
Crankset Chainwheel:9T Cassette
Fork:GT Dirt/Street Design, Hi-Ten 31.8- 28.6mm Tapered O.D. Blades, Cr-Mo Steerer, 320mm A/C, 3/8" Axle
Front Suspension:GT, Cro-Mo Steerer/ Hi-Ten, 31.8-28.6 Taper, 3/8, 1 1/8"
Front hub:GT Alloy, 32h
Grips:GT Wings Logo 130mm Single Compound
Handlebar:GT 100% Chromoly 690mm width, 210mm rise, 11 degree sweep, 3-degree tip, taper Crossbar
Handlebar shape:BMX bar
Headset:FSA, 1 1/8" Integrated Design 45x 45 Sealed Bearings
Hubs:(F) 36H Alloy Body, Sealed Bearing 3/8" Axle, (R) Alloy 5pcs Sealed Bearings, CR-MO Axle, 9T Cassette 36 Hole
Pedals:GT Low Profile Large Size Platform Design, PP Material, Boran Axle
Rear cogs:One Piece Driver, 9t
Rear hub:GT Alloy, 36h
Rims:BX-32, 36H, Double Wall
Saddle:GT Dirt Design Unifed Padded
Seat Clamp:Alloy, 28.6mm
Seat post:Integrated With Saddle
Sizes:20" Wheel, 21" Top Tube
Spokes:Stainless Steel
Stem:GT Top Load Design With Cold Forged Clamp, 50mm Ext, GT CNC logo
Tires:(F) GT Sandbox Dirt Tread 20" x 2.10", (R) GT Pool Street Tread 20" x 2.10"
Wheel size:20 inches
Wheels/Hubs:GT AL Cassette Sealed 3/8F, 14mmr 32F, 36R Hole

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