GT 2021 Mach One Expert Bike (Blue) (19.5" TopTube)

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Price: $400.00
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The GT Mach One BMX bike is complete and ready to race right out of the box. One race is all it takes to plant the seed of wanting a podium finish. Whether you're new to the sport or looking to up your game to the next level, the 2021 Race bikes from GT are a perfect fit. Strong stiff and light, they are built ready to train and secure that win

Frame: 6061-T6 Aluminum, Euro Bottom Bracket, Reverse Dropouts     
Fork: GT BMX Race, Hi-Ten Steel 1-1/8 steerer, 3/8" dropouts   
Headset: 1-1/8" integrated 45 x 45 degree sealed bearings 
Stem: GT Top Load 1" 40mm 
Bars: GT Race, Steel, 6.5" High x 26" Wide, 8° Back, 4° Up, 19mm O.D. Cross Bar 
Grips: GT Statement 
Crancks: GT Alloy forged 3 Piece 165mm, square taper         
Bottom Bracket: Threaded square type          
Pedals: GT Mini size platform, PP material  
Chain: KMC S1 
Chainring:  BCD100, 38T Steel Chainring, 5-bolt 
Front Hub: Steel body (28H). 3/8" axle     
Rear Hub: Steel flip flop thread-on body, freewheel, (28H), 3/8" axle      
Rims: 28H Alloy double Wall 
Spokes:  Stainless Spokes, 14g       
Cog Set: 16T freewheel          
Tires: Kenda Race, 20 x 1-3/8"          
Seat: GT Uni Mini Padded     
Seat Post: Alloy 22.2 Integrated  
Seat Clamp: TBA          
Lever: Alloy V-type         
Brakes: Alloy V-type       
Extras: N/A         
Weight: TBA

Frame Geometry:        
Toptube: 19.5"      
Headtube Angle: 73°          
Seattube Angle: 70°       
BB Height: 11.5"     
Chainstays: 13.62"         
Sizing Guideline: 4'8"-5'4"

Need help building your complete bike? Check out our bike build video below.     

NOTE: To ensure that every component on your bicycle is working properly, Dans Comp recommends that all bikes be assembled by a qualified mechanic. Improper assembly of your bicycle may lead to premature wear or failure of individual components such as headsets, crank assembly and wheels. Failure to do so may void the manufacturer warranty.

Verified Owner
Monday, Oct 5 2020 (6 months ago)
GT 2021 Mach One Expert Bike (Blue) (19.5" TopTube)
I just got this for my 9 year old. She is 4'5" and she rode this out of the box like a champ during her first practice at a real track. It's light as well. The paint job is awesome. Though I can see it getting dinged up in the rigors of transporting and racing. For a novice this bike is good.

My daughter already busted the left pedal and crank arm. I can't get replacement parts from GT, so I'm ordering a new crankset and re-gearing it to my daughter. The crankset and arms are the weak part of this bike. The crankset components don't seem to be any better than what comes on a Mongoose from the big box.

Update: I got a Promax Sq-1 crank with 165mm arms. The arms are too fat. In fact every crank arm I found is too fat and strikes the chainstay. I'll need a new bottom bracket with wider spacing or grind the arms. After a few practices some pieces are falling apart like a department store bike. The frame and wheels/tires are the only good parts. The drivetrain has to be completely replaced if you plan to make any changes. Actually if you buy this bike go ahead and order a new BB and crankset with it. Left arm came off easy. Right arm threads stripped as soon as the puller started to work. So now I have to get a ball joint fork and bust it off. The crankset is absolute junk on this bike.