Item # qgtbum20scgr13zz-gt-bmx-bikes

GT Bump BMX Bike 20in

GT Bump BMX Bike 20in
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Description: GT Bump BMX Bike 20in

The GT Bump BMX Bike is has everything you need to hop on and get down at the park and trails or just rip around the streets. It features a chromoly main frame and a downtube gusset for extra strength. The GT 3-piece crankset is full chromoly and has a sealed bottom bracket. The wheels are sweet, featuring fully sealed hubs and a 9T driver on the rear cassette. Tektro U-brakes are there for quick stops, but once you are on this bike, you won't want to.

Key Features of the GT Bump BMX Bike 20in:
  • Frame: Chromoly; 2013 dirt design
  • Fork: Hi-Ten Steel; 31.8- 28.6mm Tapered O.D. Blades; Cr-Mo Steerer; 320mm A/C, 3/8" axle
  • Crank: GT Tubular Cr-Mo 3Pc; 175mm Arms; Cold Forged Cr-Mo 19mm x 8T Spline Spindle; 5mm 25T GT AL Chain Wheel
  • Chain: KMC Z410
  • Bottom Bracket: MID Sealed Bearing
  • Pedals: GT Low Profile Large Size Platform Design; PP Material; Boran Axle
  • Cog Set: 9T One Piece Driver
  • Rims: Alienation Black Sheep F/R; Double Wall 32F/36R Hole
  • Tires: GT Sandbox Dirt Tread 20"x2.1" F/R
  • Front Hub: GT Alloy Body, Sealed Bearing 3/8" Cr-Mo Axle, 32 Hole
  • Rear Hub: Sealed Bearing 14mm 9T Cassette 36 Hole
  • Spokes: 14G
  • Nipples: Brass
  • Brake Levers: Tektro XL320 Alloy
  • Handlebars: GT Chromoly; 690mm Width; 210mm Rise; 11 Degree Sweep; 3 Degree Tip; Taper Cross Bar
  • Stem: GT Top Load Design With Cold Forged Clamp; 50mm Ext
  • Grips: GT Wings Logo 130mm Single Compound
  • Headset: FPD 1 1/8" Integrated Design 45 x 45 Degree Sealed Bearings
  • Saddle: GT Dirt Design Unifed Padded Saddle w/ Post
  • Seat Post: Integrated With Saddle, 135mm
  • Seat Clamp: Alloy, single bolt
  • Weight: 24lbs 10oz


NOTE: All bikes are sold and delivered partially assembled. Final assembly should be done by a certified bike technician. Failure to have the bike assembled by a certified bike technician may void the warranty and could result in damage and/or injury if not assembled correctly.

5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Clean bike!
So I chose this bike over another I was considering because it appeared to have a more refined fit and finish. I was right. Along with some tapered tubing on the handlebars, it has little chrome wings on the white brake line, wing logo throughout. -I like that kind of thing. The dirt tires have a nice looking and smooth running tread. The seat is NOT comfy. But not too worried about getting a new custom seat.

Free extras from THE HOUSE made it even better!
Was this review helpful? Yes (1) No (0) · Flag as Inappropriate
August 10, 2015
10 months ago
GT Bump: Best value for the price on the market!
This is a very high quality build at an outstanding price. I only had about $450 to spend on a bike. I checked out this site along with 4 other popular bike websites and for this price this bike was the best build. The only other one that compared in quality (100% chromoly and sealed hubs & BB) cost $150 more. After taking off the reflectors and chain guard the bike weighed in at 24.4 lbs. With a shorter seat post this bike would be 24 lbs which is a great weight. The graphics are just stickers but they look very nice and the bike handles extremely well. The tires are great for both road and dirt. I would buy this bike many times over! You cant go wrong with it.
Was this review helpful? Yes (1) No (0) · Flag as Inappropriate
August 24, 2015
Tyler, TX, US
Age: 25-44

Browse 20 questions and 40 answers
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Why did you choose this? Store
Best bike I could find for the money.
Ty W on Dec 1, 2015
I found this bike in the Bike outlet section and seemed to be decent specs. and fair price.
Shane B on Jul 19, 2014
My son researched a lot of bikes and found this to be the best fit for him.
Lynn B on Dec 13, 2014
I'm 5'9 and weigh 200 pounds. Will this bike support me? Thanks.
MILAN I on Jul 17, 2014
Best Answer: The GT Bump has a weight limit of 200lbs.
Reply · Report · Mark SStaff on Jul 22, 2014
· Add Answer · I Have This Question Too (4)
Is it possible to pedal bakwards on the bmx? Like the same as forward?
Isak R on May 29, 2014
Best Answer: No, That can only be done on a fixed gear bike. A BMX bike uses either a cassette hub similar to any mountain/road bike, a freewheel that acts the same as a mountain/road bike in practice or a freecoaster. All three of these allow you to move the pedals backwards without changing the rotation and momentum of the wheel
Reply · Report · Chris F on Jun 11, 2014
· Add Answer · I Have This Question Too (3)
Purchasing for my son. Is this bike good for jumping? If not can you recommend something that is?
Rhonda B on Aug 2, 2015
Best Answer: It is excellent for jumping. I weigh 160 lbs and I have been riding for about 8 months. I've upgraded my front forks and recently bent my rear hub but it's mostly due to me riding with pegs and grinding everything in sight! I love this bike and it is an excellent beginner bike. I would certainly recommend it for jumping. You may have to replace a few parts here and there but overall it's a great bike and I love it more every day!
Reply (1) · Report · Bnasty on Aug 2, 2015
· Add Answer · I Have This Question Too (1)
does this bike come with double walled rims?
A shopper on Aug 14, 2014
Best Answer: Yes they are double walled Alienation(Blacksheep) Rims
Reply · Report · Shane B on Aug 14, 2014
· Add Answer · I Have This Question Too (1)
Is this full chromoly?
A shopper on Jun 18, 2014
Best Answer: the GT Bump is GT Dirt Design Frame with Cr-Mo Main Tubes (H/T, T/T, D/T) and CrMo Steerer Fork
Reply · Report · Mark SStaff on Jun 25, 2014
· Add Answer · I Have This Question Too (1)
Looking for a bike like the gt bump bmx bike matte black 20in 2014 any sugg have a 250- 300 dollar budget?
A shopper on Jul 18, 2014
Best Answer: hands down one of the best bmx bikes that will last will be the GT Bump that comes with Chromoly frame fork and bars. This beast of a bike is being sold at $307.95. A lot of bang for your buck!!
Reply · Report · David GStaff on Jul 31, 2014
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is it a god bike to do tricks?
A shopper on Sep 30, 2015
Best Answer: When I looked into it this bike is classified as a "dirt jumper" so
Peons not the best choice
For just tricks in particular, but hey it is a box bike so in the end i don't think it would matter. Hope that helps if not just look up specifically bmx bikes for tricks. And all I do on it is bunny hops and jumps, rides fast and smooth and handles great. Tough light bike!
Reply · Report · suriel j on Sep 30, 2015
· Add Answer · I Have This Question Too (0)
My 11 year old son is 4' 10'' 86 lbs and a very athletic bike rider. Is the 2013 20'' Bump too much bike for his stature ?

A shopper on Sep 8, 2015
Best Answer: The the bike top tube is 20.5 inches. The sizing chart I found on the site somewhere may recommend a smaller top tube but the difference in lengths seems pretty trivial to me. Especially concidering that this bike will last as he grows into it
Reply · Report · jacob m on Sep 10, 2015
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does it come with pegs?
julian n on Oct 25, 2014
Best Answer: no it does not come with pegs. And if you do buy this bike and decide to get pegs make sure to measure each axle BEFORE you buy pegs to get a proper fit!!!
Reply · Report · suriel j on Oct 26, 2014
· Add Answer · I Have This Question Too (0)
I am buying a BMX Dirt bike so I can race BMX dirt. Is this a good bike for that? If not, what is?
Cam O on Nov 20, 2015
Best Answer: Hi Cam,
The Bump is a simple, but sweet freestyle BMX bike. It does have a Chromoly frame which is robust enough to handle anything you can put it though. It is not super light though and as a result it may not be the idea racing bike. You may want to look at a bike with an Aluminum frame, larger chain ring, and thinner tires. Something more like this: or
Reply (2) · Report · Keyser S.Staff on Nov 20, 2015
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I am buying my boyfriend a new bmx bike for Christmas, he is 5'5 would this bike in a 20.5 or 20.75 top tube be better? (I'm not very knowledgeable on bikes)
Alison J on Dec 11, 2014
Best Answer: Alison,
I agree. The difference will not be huge... although for the record, GT suggests that the 20.5 would be the optimal choice. I recommend you chat with our bike guys to make sure you get your BF the perfect bike. Cool present! 1 (800) 409-7669
Reply · Report · Keyser S.Staff on Dec 12, 2014
· Add Answer · I Have This Question Too (0)
How much does it weigh?
A shopper on Nov 26, 2014
Best Answer: 26lbs??...that's odd. After a series of weigh ins I can firmly state that this bike is 23.8 lbs without chain guard on.
Reply · Report · Darren B on Feb 11, 2016
· Add Answer · I Have This Question Too (0)
Is this the 2014 model?
A shopper on Sep 21, 2014
Best Answer: This GT Bump BMX Bike is a 2013 model
Reply · Report · Keyser S.Staff on Sep 22, 2014
· Add Answer · I Have This Question Too (0)
Is it better to assemble the bike yourself or take it to a bike shop? I don't know where to locate a certified bmx tech in my area! I live In omaha Nebraska. Any tips?
suriel j on Sep 6, 2014
Best Answer: The bike come mostly assembled except the handle bars and front tire are off. The only thing you need too double check is that the h handle bars are not overtightened or under tightened. Just lift the front tire off the ground and move the handle bars making sure they move freely without any hitch or noise..
Reply · Report · Shane B on Sep 9, 2014
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I am looking for a BMX bike for my son, that is very durable. One that the crank shaft will not come apart and under $300?
A shopper on Aug 6, 2015
Best Answer: Good Day!
With BMX Bikes, durability is interconnected with price... no way around it. For $300 you can get a bike that will survive a park, and have reasonable components. This GT Bump is actually the best option for you... Chromoly Frame and Cranks, and descent parts. It does still have a Hi-Ten Fork.... good bike though.
Reply · Report · Keyser S.Staff on Aug 6, 2015
· Add Answer · I Have This Question Too (0)
stupid question: do the bikes i buy from this website come brand new and built?
A shopper on Jul 25, 2015
Best Answer: Good Day!
Not a stupid question. All of the bikes we offer are indeed brand new. If you have them shipped to you they will come 3/4 assembled. Keep asking questions here, shoot me an e-mail, or feel free to chat with our BMX specialists to get more info: 1 (800) 409-7669.
Reply · Report · Keyser S.Staff on Jul 27, 2015
· Add Answer · I Have This Question Too (0)
How does this Bump compare to the other Bump you currently have for $309.99? Are they the same specs? I want to buy one today but want to make sure I am getting the best one of the two. Thank you.
Bnasty on Mar 27, 2015
Best Answer: Good Day!
Spec wise both of these GT Bumps are going to be quite similar. The Bump listed here is the 2013 model, and the 309 option is the 2014 model. Both are a fantastic choices. Let me know if have other concerns!
Reply · Report · Keyser S.Staff on Mar 27, 2015
· Add Answer · I Have This Question Too (0)
How much does it a high?
A shopper on Sep 6, 2014
Best Answer: How much does the GT Bump BMX Bike 20in weigh? 26lbs. Hope this helps!
Reply · Report · Keyser S.Staff on Sep 8, 2014
· Add Answer · I Have This Question Too (0)

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