
1998 GT Speed Series. American craftsmanship. The new angle-cut Box stay dropouts add a cleaner look to the rear of the frame, while providing more room to maneuver a wrench for wheel adjustments.
GT U.S.A.-made 6061 aluminum frame with Box Series chainstays • Slammed geometry with shorter fork blades for improved stability and better acceleration • GT cold-forged 180mm aluminum three-piece cranks with 7075 aluminum spindle and sealed-bearing bottom bracket • Dia-Compe direct-pull brake and lever • GT cartridge sealed-bearing hi-flange Mohawk hubs with stainless steel spokes & alloy nipples • GT 4130 CrMo Pro handlebar with narrow width and increased flat section to keep your grips and brake lever out of the handlebar bend • GT U.S.A.-made Cam Shaft rubber grip • Colors: Ball Burnished
Headset Size
1 1/8"
Seatpost Size
Below
Top Tube Size
Below
Original Colours
| HT˚ | ST˚ | TT | CS | WB | BB | FC | SP |
| XXL | |||||||
| 73˚ | 70˚ | 21 | 15.75 - 17 | 39 - 40.25 | 12 | 23.5 | 27 |
| XL Plus | |||||||
| 73˚ | 70˚ | 21 | 15 - 16.4 | 38.3 - 39.7 | 12 | 23.5 | 27 |
| XL | |||||||
| 73˚ | 70˚ | 20.25 | 15 - 16.4 | 37.6 - 38.95 | 12 | 22.75 | 27 |
| Expert | |||||||
| 73˚ | 69.5˚ | 18.9 | 13.75 - 14.9 | 34.6 - 35.8 | 11.5 | 21 | 22.2 |
All measurements in inches. WB = Wheel Base Length, CS = Chain Stay Length, HT˚ = Head Tube Angle, ST˚ = Seat Tube Angle, BB = Bottom Bracket Set Height.
MM970000 MM980000
Made in USA.
Third and fourth digits in the serial indicate year of production. 1997 or 1998. MM in the example above indicates production month
Bikes made in USA usually had an 4-6 month production and shipping timeline before they were sold in bike shops around the world. Bikes welded in the second half of the year would normally be made for the following year.
For more detail on what the serial number means on your mid school GT BMX, check out our easy-to-follow serial number guide.