SX125 Pro (1989–1998) — Supercross BMX Heritage
Supercross BMX Heritage Collection · The Cro-Mo Years
SX125 Pro
1989–1998The Pro-size companion to the SX250 — same six-bar backbone, sized for the Pro class rider.
The SX250 Pro XL launched the company; the SX125 Pro completed the line. Same seamless 4130 chromoly, same six-bar rear end, sized for the Pro rider.
The Story
The SX125 Pro size joined the line in the brand's first years and stayed there through 1998, sharing the SX250's construction on a 20.5" top tube: seamless 4130 chromoly, the lowered twin seat stay rear end, a 1" threaded head tube set up for sidepull brakes, an American bottom bracket, and chrome or powder-coat finishes.
In 1992 it took the same changes as the SX250 — cantilever V-brakes and a 1-1/8" threadless head tube, with a few rare 1" threadless transition frames — at $189 for the frame and fork set. New-old-stock chrome examples from the late 1990s still surface today; one 1997 frame donated by Bill Ryan was built into a period-correct sidehack.
The SX125 also carried the factory Team complete: the '94 Supercross XLT shipped in both SX125 Pro and SX250 Pro XL sizes. The 20-1/2" top tube BMX Plus! quoted in its August 1994 spy photo of the XLT was this frame's Pro size.
Specifications
| Spec | Detail |
|---|---|
| Production years | 1989–1998 |
| Material | Seamless 4130 chromoly |
| Top tube | 20.5 in |
| Rear end | 15 in, six-bar twin seat stay design |
| Head angle | 74° |
| BB height | 11.75 in |
| Head tube | 1 in threaded; 1-1/8 in threadless from 1992 |
| Bottom bracket | American |
| Seat post | 7/8 in (22.2 mm) post, 1 in (25.4 mm) clamp |
| Brakes | Sidepull; cantilever V-brakes from 1992 |
| Price | $189 frame and fork (from 1992) |
| Source | BMX Plus!, August 1994, p. 20 — the '94 Supercross XLT Team complete shipped in SX125 Pro and SX250 Pro XL sizes |