Motocross

KTM 50 SX

Motocross, 49.9cc 2T, 2027

Partly verified

Gearing

1 of 5 filled

Stock front sprocket: Not yet verified
Stock rear sprocket: Not yet verified
Chain pitch: 415; Manufacturer spec sheet (research), checked 2026-09-26 (source 1)
Stock chain links: Not yet verified
Stock final drive ratio: Not yet verified

Wheels and tires

0 of 4 filled

Front rim: Not yet verified
Rear rim: Not yet verified
Front tire: Not yet verified
Rear tire: Not yet verified

Suspension

3 of 7 filled

Fork: XACT 35 WP Upside-Down fork, Ø 35 mm; Manufacturer spec sheet (research), checked 2026-09-26 (source 1)
Fork travel: 165 mm (6.5 in); Manufacturer spec sheet (research), checked 2026-09-26 (source 1)
Shock travel: 190.5 mm (7.5 in); Manufacturer spec sheet (research), checked 2026-09-26 (source 1)
Stock fork spring rate: Not yet verified
Stock shock spring rate: Not yet verified
Static sag, bike only: Not yet verified
Race sag, rider on: Not yet verified

Fluids and capacities

2 of 5 filled

Engine oil spec: ATF \"Motorex Dexron 3\"; Manufacturer spec sheet (research), checked 2026-09-26 (source 1)
Engine oil capacity: Not yet verified
Coolant capacity: Not yet verified
Premix ratio: Not yet verified
Fuel capacity: 2.3 L (0.61 gal); Manufacturer spec sheet (research), checked 2026-09-26 (source 1)

Dimensions

2 of 3 filled

Seat height: 653 mm (25.7 in); Manufacturer spec sheet (research), checked 2026-09-26 (source 1)
Wheelbase: Not yet verified
Weight: 43.5 kg (96 lb); Manufacturer spec sheet (research), checked 2026-09-26 (source 1)

Solid marks are owner's-manual pages; hollow marks are manufacturer web or spec-sheet figures still waiting on a manual page. Last reviewed 2026-09-26. Rows marked not yet verified are blank on purpose.

What's missing

0 of 24 fields read off a manual page.

Not yet verified (17): front sprocket, rear sprocket, chain links, front rim, rear rim, front tire, rear tire, fork spring rate, shock spring rate, static sag, race sag, coolant capacity, premix ratio, wheelbase, maintenance.tire_pressure, maintenance.chain_slack, maintenance.spark_plug.

From a spec sheet, awaiting a manual page (7): chain pitch, fork, fork travel, shock travel, fuel capacity, seat height, weight.

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Buying parts

The stock sizes and specs this bike left the factory with, each with its source. Take them to any shop. Retailer links will appear here once a store approves MotoXSports.

Chain: Chain pitch 415 Manufacturer spec sheet (research)
Engine oil: Engine oil spec ATF \"Motorex Dexron 3\" Manufacturer spec sheet (research)

9 part specs not yet verified; see data coverage.

Gearing tool

The calculator prefills from this bike once its stock sprockets are verified. It works with any numbers in the meantime.

Open the gearing calculator

Sources

1
KTM 2027 50 SX technical specifications (US)Manufacturer web or spec sheet, research level. Covers chain pitch, fork, fork travel, shock travel, engine oil spec, fuel capacity, seat height, weight; checked 2026-09-26.

Always confirm against the manual for your exact year before ordering parts or setting up suspension. Torque specs are deliberately not published here. How we verify a value.

My settings

Date / track
Sprockets run
Race sag / free sag
Fork air pressure or spring
Fork clickers (compression / rebound)
Shock clickers (low / high / rebound)
Tire pressures (front / rear)
Notes

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