Mongoose FS-1

2025 BMX Manufacturer page

Last known price: $549

Prices shown first for United States
Suspension: Rigid
Wheels: 20″
Frame: Steel
Brakes: Rim brake

Rider height by size (cm)

Size guide

20" 120+

Components

2 of 17 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

4130 chromoly, 1 in headtube Not identified

Suspension

1 part

Fork

20", 4130 chromoly Not identified

Drivetrain

3 parts

Bottom bracket

American loose ball, 68mm Not identified
Chain
- KMC
Crankset

1-piece, 42T Not identified

Brakes

1 part

Brakes

DiaCompe, U-brake, aluminum Not identified

Wheels and tires

4 parts

Front hub

Ball bearing, bolt-on Not identified
Rear hub

Ball bearing, bolt-on Not identified
Rims

25 mm ID Not identified
Tires
- Mongoose

Cockpit and contact points

7 parts

Grips

120 mm Not identified
Handlebar

Steel, 28 in width, 8 in rise, 22.2 mm clamp Not identified
Headset

Threaded, 1", ball bearing Not identified
Pedals

Nylon Not identified
Saddle

Viscount Dominator, steel rails Not identified
Seatpost

Laidback, steel, 300 mm, 22.2 mm Not identified
Stem

Aluminum/steel, quill, 50 mm ext. 22.2 mm clamp Not identified

Sizes and geometry

1 size Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 20"

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Frame
Top tube lengthmm	485
Seat tube lengthmm	255
Head tube lengthmm	100
Head tube angle	73°
Seat tube angle	73°
Chainstay lengthmm	380
Wheelbasemm	916
Front centermm	539
Bottom bracket dropmm	35
Standover heightmm	598
Fork rakemm	30
Suspension and parts
Crank lengthmm	170
Stem lengthmm	50

Not published by the manufacturer: Reach, Stack, Bottom bracket height, Trail, Stack/reach ratio, Front travel, Rear travel, Handlebar width, Stem angle, Seatpost length and Dropper post travel.