Your firstreal gas bike

The 125cc FX125 is built for a maximum load of 265 lb, so it carries growing teens and full-grown adults — not just small kids. The 40cc FX40 is rated for riders up to 132 lb.

It comes down to size more than age. The FX125 ships in two wheel sizes: the 14-inch / 12-inch setup with a lower seat suits younger or shorter riders learning to shift, while the 17-inch / 14-inch fits taller teens and adults. A confident 12-year-old can ride the smaller size with supervision.

The FX125's seat height is 28.1 inches on the 14"/12" small-wheel build and 33.9 inches on the 17"/14" big-wheel build — that range is what lets one 125cc dirt bike fit a wide span of riders instead of forcing you to buy again next year.

FRP lists the FX140 at about 65 mph (105 km/h) from its 140cc oil-cooled engine — a real step up from a first dirt bike. Actual top speed varies with rider weight, gearing and terrain. The FX140 is an EPA off-road bike, not street legal.

The FX40 Ogemaw is a 40cc gas kids dirt bike for riders roughly 6 to 12. Top speed is capped at 20 mph and it carries up to 132 lb, with full front and rear suspension plus dual disc brakes to keep first rides under control.

Choose the FX125 if the rider is still learning to ride and shift; choose the FX140 if they have outgrown a first dirt bike and want more power and bigger brakes. We break the whole decision down in our125cc vs 140cc dirt bike guide.

No — FRP dirt bikes are EPA off-road models, not street legal or registered for public roads. Ride them on private property, trails and off-road areas. The FX40 and FX140 are not sold in California.

No. Every FRP FX is a four-stroke — no fuel-and-oil premixing and no mix-ratio math, just gas in the tank. One less thing for a new rider or parent to get wrong.

For most 8–10 year olds new to riding, start on the 40cc FX40 — 20 mph, full suspension, twist-and-go. A bigger or more confident 12–15 year old ready to shift fits the FX125 in its smaller 14"/12" size. Height and confidence matter more than age.

Both names get used for bikes this size. The FX125 and FX140 are off-road trail dirt bikes built on pit-bike-sized frames — so whether you searched "125cc pit bike," "140cc pit bike" or "dirt bike," these are what you're looking for.

The FX125 tops out around 56 mph (90 km/h) — quick enough for real trail riding while you learn to shift. If you want even more top end, the FX140 steps up further.

The FX125 is a true manual — a 4-speed gearbox with a wet multi-plate clutch, so you pull the clutch and shift like a full-size dirt bike. It is not automatic and not a no-clutch pit bike, which is exactly how a rider learns to shift.

The FX140 is a 4-speed manual with a hand clutch and foot shifter (chain drive) — not semi-automatic and not automatic. It is the step up for riders who already know how to shift and want more speed.