2021 KTM SX

MSRP Price From

$4,549
Displacement
143.90 cc
Engine Type
Single-Cylinder
Cylinders
1
Transmission
6 speed / Manual
Weight As Shipped
192.90 lbs (87.50 kg)
Front Braking System
Hydraulic Disc / 260 mm

Compare trims

KTMSX 50 MINI

50 MINI

KTMSX 50

50

KTMSX E 5

E 5

KTMSX 65

65

KTMSX 50 Factory Edition

50 Factory Edition

KTMSX 85 1714

85 1714

KTMSX 85 1916

85 1916

KTMSX 125

125

KTMSX 150

150

KTMSX 250

250

KTMSX 250 F

250 F

KTMSX 350 F

350 F

KTMSX 250 F Troy Lee Designs

250 F Troy Lee Designs

KTMSX 450 F

450 F

KTMSX 450 F Factory Edition

450 F Factory Edition

MSRP
$4,549
$4,949
$5,899
$5,899
$5,999
$6,899
$7,099
$8,799
$8,999
$9,399
$10,599
$11,399
$11,699
$11,699
$13,099
Type
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Dirt Motocross
Front Braking System
Hydraulic Disc / 160 mm
Hydraulic Disc / 160 mm
Hydraulic Disc / 160 mm
Hydraulic Disc / 198 mm
Hydraulic Disc / 160 mm
Hydraulic Disc / 240 mm
Hydraulic Disc / 240 mm
Hydraulic Disc / 260 mm
Hydraulic Disc / 260 mm
Hydraulic Disc / 260 mm
Hydraulic Disc / 260 mm
Hydraulic Disc / 260 mm
Hydraulic Disc / 260 mm
Hydraulic Disc / 260 mm
Hydraulic Disc / 260 mm
Rear Braking System
Hydraulic Disc / 160 mm
Hydraulic Disc / 160 mm
Hydraulic Disc / 160 mm
Hydraulic Disc / 160 mm
Hydraulic Disc / 160 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Hydraulic Disc / 220 mm
Fuel Capacity
2.10 l (0.60 gal)
2.30 l (0.60 gal)
-
3.50 l (0.90 gal)
2.30 l (0.60 gal)
5.20 l (1.40 gal)
5.20 l (1.40 gal)
7.50 l (2 gal)
7.50 l (2 gal)
7.50 l (2 gal)
7 l (1.80 gal)
7 l (1.80 gal)
7 l (1.80 gal)
7 l (1.80 gal)
7 l (1.80 gal)
Cooling
Liquid
Liquid
Air
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Ground Clearance
7.20 in (184 mm)
9.90 in (252 mm)
9.90 in (252 mm)
11 in (280 mm)
9.90 in (252 mm)
13.90 in (352 mm)
14.80 in (377 mm)
14.80 in (375 mm)
14.80 in (375 mm)
14.80 in (375 mm)
14.60 in (370 mm)
14.60 in (370 mm)
14.60 in (370 mm)
14.60 in (370 mm)
14.60 in (370 mm)
Seat Height
22 in (558 mm)
26.90 in (684 mm)
26.20 in (665 mm)
29.50 in (750 mm)
26.20 in (665 mm)
33.50 in (850 mm)
34.40 in (875 mm)
33.50 in (850 mm)
33.50 in (850 mm)
33.50 in (850 mm)
37.40 in (950 mm)
37.40 in (950 mm)
37.40 in (950 mm)
37.40 in (950 mm)
37.40 in (950 mm)
Wheelbase
36 in (914 mm)
40.60 in (1,032 mm)
40.60 in (1,032 mm)
44.80 in (1,137 mm)
40.60 in (1,032 mm)
50.80 in (1,290 mm)
50.80 in (1,290 mm)
58.50 in (1,485 mm)
58.50 in (1,485 mm)
58.50 in (1,485 mm)
58.50 in (1,485 mm)
58.50 in (1,485 mm)
58.50 in (1,485 mm)
58.50 in (1,485 mm)
58.50 in (1,485 mm)
Primary Drive
Gear , Chain
Gear , Chain
-
Gear , Chain
Gear , Chain
Gear , Chain
Gear , Chain
-
-
-
-
-
-
Gear , Chain
Gear , Chain
Gear Ratios
-
-
-
2.85 / 2.13 / 1.72 / 1.43 / 1.22 / 1.08
-
2.64 / 2 / 1.63 / 1.37 / 1.19 / 1.05
2.64 / 2 / 1.63 / 1.37 / 1.19 / 1.05
2.46 / 2 / 1.65 / 1.40 / 1.21 / 1.09
2.46 / 2 / 1.65 / 1.40 / 1.21 / 1.09
-
-
-
-
-
-
Bore
1.56 in (39.50 mm)
1.56 in (39.50 mm)
-
1.77 in (45 mm)
1.56 in (39.50 mm)
1.85 in (47 mm)
1.85 in (47 mm)
2.13 in (54 mm)
2.28 in (58 mm)
2.61 in (66.40 mm)
3.07 in (78 mm)
3.46 in (88 mm)
3.07 in (78 mm)
3.74 in (95 mm)
3.74 in (95 mm)
Carburetor
Carburetor
Carburetor
-
Carburetor
Carburetor
Carburetor
Carburetor
Carburetor
Carburetor
Carburetor
Fuel Injected
Fuel Injected
Fuel Injected
Fuel Injected
Fuel Injected
Cylinders
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
Displacement
49 cc
49 cc
-
64.90 cc
49 cc
84.90 cc
84.90 cc
124.80 cc
143.90 cc
249 cc
249.90 cc
349.70 cc
249.90 cc
449.90 cc
449.90 cc
Engine Type
Single-Cylinder
Single-Cylinder
Electric
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Single-Cylinder
Stroke
1.57 in (40 mm)
1.57 in (40 mm)
-
1.61 in (40.80 mm)
1.57 in (40 mm)
1.93 in (49 mm)
1.93 in (49 mm)
2.15 in (54.50 mm)
2.15 in (54.50 mm)
2.83 in (72 mm)
2.06 in (52.30 mm)
2.26 in (57.50 mm)
2.06 in (52.30 mm)
2.50 in (63.40 mm)
2.50 in (63.40 mm)
Compression Ratio
-
-
-
-
-
-
-
-
-
-
14.4:1
14:1
14.4:1
12.8:1
12.8:1
Transmission
1 speed / Automatic
1 speed / Automatic
1 speed / Direct Drive
6 speed / Manual
1 speed / Automatic
6 speed / Manual
6 speed / Manual
6 speed / Manual
6 speed / Manual
5 speed / Manual
5 speed / Manual
5 speed / Manual
5 speed / Manual
5 speed / Manual
5 speed / Manual
Weight As Shipped
88.20 lbs (40 kg)
91.50 lbs (41.50 kg)
89.30 lbs (40.50 kg)
116.80 lbs (53 kg)
91.50 lbs (41.50 kg)
147.70 lbs (67 kg)
149.90 lbs (68 kg)
192.90 lbs (87.50 kg)
192.90 lbs (87.50 kg)
192.90 lbs (87.50 kg)
218.30 lbs (99 kg)
219.40 lbs (99.50 kg)
222.70 lbs (101 kg)
220.50 lbs (100 kg)
221.60 lbs (100.50 kg)
Front Wheel
Aluminum 10 in x 2.50 in
Aluminum 12 in x 2.50 in
-
-
Aluminum 12 in x 2.50 in
Aluminum 17 in x 1.40 in
Aluminum 19 in x 1.40 in
Aluminum 21 in x 1.60 in
Aluminum 21 in x 1.60 in
Aluminum 21 in x 1.60 in
Aluminum 21 in x 1.60 in
Aluminum 21 in x 1.60 in
Aluminum 21 in x 1.60 in
Aluminum 21 in x 1.60 in
Aluminum 21 in x 1.60 in
Rear Wheel
Aluminum 10 in x 2.75 in
Aluminum 10 in x 2.75 in
Aluminum 10 in x 2.75 in
-
Aluminum 10 in x 2.75 in
Aluminum 14 in x 1.60 in
Aluminum 16 in x 1.60 in
Aluminum 19 in x 2.15 in
Aluminum 19 in x 2.15 in
Aluminum 19 in x 2.15 in
Aluminum 19 in x 2.15 in
Aluminum 19 in x 2.15 in
Aluminum 19 in x 2.15 in
Aluminum 19 in x 2.15 in
Aluminum 19 in x 2.15 in
Tires Front Specification
Maxxis Maxxis Maxx Cross SI 2.50 X 10 38J
Maxxis Maxxis Maxx Cross SI 2.50 X 12 42J
Maxxis Maxxis 60/100 R12
Maxxis Maxxis Maxx Cross SI 60/100 R14 30M
Dunlop Dunlop GEOMAX MX53 2.50 X 12 42J
Maxxis Maxxis Maxx Cross SI 70/100 R17 40M
Maxxis Maxxis Maxx Cross SI 70/100 R19 40M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Dunlop Dunlop GEOMAX MX3S 80/100 R21 51M
Tires Rear Specification
Maxxis Maxxis Maxx Cross SI 2.75 X 10 38J
Maxxis Maxxis Maxx Cross SI 2.75 X 10 38J
Maxxis Maxxis 2.75 x 10
Maxxis Maxxis Maxx Cross SI 80/100 R12 41M
Dunlop Dunlop GEOMAX MX53 2.75 X 10 38J
Maxxis Maxxis Maxx Cross SI 90/100 R14 49M
Maxxis Maxxis Maxx Cross SI 90/100 R16 49M
Dunlop Dunlop GEOMAX MX3S 100/90 R19 57M
Dunlop Dunlop GEOMAX MX3S 100/90 R19 57M
Dunlop Dunlop GEOMAX MX3S 110/90 R19 62M
Dunlop Dunlop GEOMAX MX3S 110/90 R19 62M
Dunlop Dunlop GEOMAX MX3S 120/80 R19 63M
Dunlop Dunlop GEOMAX MX3S 110/90 R19 62M
Dunlop Dunlop GEOMAX MX3S 110/90 R19 62M
Dunlop Dunlop GEOMAX MX3S 110/90 R19 62M
Engine Torque
-
-
13.80 Nm
-
-
-
-
-
-
-
-
-
-
-
-

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