1998 GT Speed Series 24. GT U.S.A.-made 6061 aluminum frame with Box Series chainstays • GT cold-forged 180mm aluminum three-piece cranks with 7075 aluminum spindle & sealed-bearing bottom bracket • GT CNCd 39-tooth chainwheel • ACS Claws 17-tooth freewheel • GT cartridge sealed-bearing hi-flange Mohawk hubs with stainless steel spokes & alloy nipples • GT U.S.A. -made 4130 CrMo handlebar • GT inverted Piston stem • Colors: Ball Burnished
Headset Size
1 1/8"
Seatpost Size
27
Top Tube Size
21.35
Original Colours
| HT˚ | ST˚ | CS | WB | BB | FC |
| 72.5˚ | 70˚ | 15.5-16.75 | 38.7-40 | 11.95 | 23.2 |
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.
