Motocross

GasGas MC 65

Motocross, 65cc 2T, 2027, US version

Verified

Gearing

4 of 5 filled

Stock front sprocket: 14T; Owner's manual p. 116, checked 2026-09-28 (source 1)
Stock rear sprocket: 48T; Owner's manual p. 116, checked 2026-09-28 (source 1)
Chain pitch: 420; Owner's manual p. 116, checked 2026-09-28 (source 1)
Stock chain links: Not yet verified
Stock final drive ratio: 3.43 : 1; Calculated from the stock sprockets

Wheels and tires

4 of 4 filled

Front rim: 14 x 1.60; Manufacturer spec sheet (research), checked 2026-09-27 (source 2)
Rear rim: 12 x 1.60; Manufacturer spec sheet (research), checked 2026-09-27 (source 2)
Front tire: 60/100-14 M/C 30M TT; Owner's manual p. 117, checked 2026-09-28 (source 1)
Rear tire: 80/100-12 41M TT; Owner's manual p. 117, checked 2026-09-28 (source 1)

Suspension

5 of 7 filled

Fork: WP XACT AER (air fork); Owner's manual p. 117, checked 2026-09-28 (source 1)
Fork travel: 215 mm (8.5 in); Owner's manual p. 116, checked 2026-09-28 (source 1)
Shock travel: 253.5 mm (10.0 in); Owner's manual p. 116, checked 2026-09-28 (source 1)
Stock fork spring rate: Not yet verified
Stock shock spring rate: Not yet verified
Static sag, bike only: 30 mm (1.2 in); Owner's manual p. 118, checked 2026-09-28 (source 1)
Race sag, rider on: 80 mm (3.1 in); Owner's manual p. 119, checked 2026-09-28 (source 1)

Fluids and capacities

3 of 3 filled

Coolant capacity: 550 ml (18.6 fl oz); Owner's manual p. 114, checked 2026-09-28 (source 1)
Premix ratio: 60:1; Owner's manual p. 117, checked 2026-09-28 (source 1)
Fuel capacity: 4.5 L (1.19 gal); Owner's manual p. 117, checked 2026-09-28 (source 1)

Maintenance

2 of 3 filled

Tire pressure (off-road): 1.0 bar (14.5 psi) front and rear; Owner's manual p. 117, checked 2026-09-28 (source 1)
Chain slack: Not yet verified
Spark plug and gap: BRISK AR12C, gap 0.70 mm; Owner's manual p. 114, checked 2026-09-28 (source 1)

Dimensions

3 of 3 filled

Seat height: 730 mm (28.7 in); Owner's manual p. 117, checked 2026-09-28 (source 1)
Wheelbase: 1142 mm (45.0 in); Owner's manual p. 116, checked 2026-09-28 (source 1)
Weight: 54.3 kg (120 lb); Owner's manual p. 117, checked 2026-09-28 (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 2026-09-28. Rows marked not yet verified are blank on purpose.

What's missing

18 of 24 fields read off a manual page.

Not yet verified (4): chain links, fork spring rate, shock spring rate, chain slack.

From a spec sheet, awaiting a manual page (2): front rim, rear rim.

See coverage for every bike

Use this bike

Tools for this bike

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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 420 Owner's manual p. 116
Sprockets: Stock front sprocket 14T Owner's manual p. 116Stock rear sprocket 48T Owner's manual p. 116
Tires: Front tire 60/100-14 M/C 30M TT Owner's manual p. 117Rear tire 80/100-12 41M TT Owner's manual p. 117
Coolant: Coolant capacity 550 ml (18.6 fl oz) Owner's manual p. 114

3 part specs not yet verified; see data coverage.

Garage tool 01

Sprocket calculator

Put your current gearing in Setup A and the setup you are considering in Setup B. Everything updates as you type.

Start from a bike's stock gearing

Pick a bike to fill both setups with its stock sprockets.

Front sprockets 10–16 teeth, rear 34–60. Values outside that range are brought back to the nearest limit.

Setup A — what you run now

Front teeth

Rear teeth

Setup B — what you are thinking about

Front teeth

Rear teeth

Final drive ratio

— — : 1

—

Pull at the wheel—

Top speed—

Chain (est.)—

A —

B —

Taller · more speed Shorter · more pull

—

Ratios are exact. The chain figure is an estimate of roughly one link per two teeth of change — confirm against your manual before ordering.

Sources

1
GASGAS Owner's Manual 2027 MC 65, Item no. 3215283en (03/08/2026); owner-supplied copy from the KTM Group print-on-demand portalpp. 114, 116, 117, 118, 119Manual page, verified. Covers stock front sprocket, stock rear sprocket, chain pitch, front tire, rear tire, fork, fork travel, shock travel, static sag, bike only, race sag, rider on, coolant capacity, fuel capacity, premix ratio, tire pressure (off-road), spark plug and gap, seat height, wheelbase, weight; checked 2026-09-28.
2
GASGAS 2027 MC 65 technical specifications (gasgas.com, US)Manufacturer web or spec sheet, research level. Covers front rim, rear rim; checked 2026-09-27.

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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