The Garage

Motocross

Honda CRF450R

Motocross, 450cc 4T, 2027

Partly verified

Illustration: a Honda motocross bike, not this exact model.

Gearing

4 of 5 filled

Stock front sprocket
13T
Manufacturer spec sheet (research), checked 2026-09-28 (source 1)
Stock rear sprocket
51T
Manufacturer spec sheet (research), checked 2026-09-28 (source 1)
Chain pitch
520
Manufacturer spec sheet (research), checked 2026-09-28 (source 1)
Stock chain links
Not yet verified
Stock final drive ratio
3.923 : 1
Owner's manual p. 74, checked 2026-09-28 (source 2)

Wheels and tires

2 of 4 filled

Front rim
Not yet verified
Rear rim
Not yet verified
Front tire
80/100-21 51M
Owner's manual p. 73, checked 2026-09-28 (source 2)
Rear tire
120/90-19 66M
Owner's manual p. 73, checked 2026-09-28 (source 2)

Suspension

3 of 7 filled

Fork
49mm inverted Showa fork
Manufacturer spec sheet (research), checked 2026-09-28 (source 1)
Fork travel
310 mm (12.2 in)
Manufacturer spec sheet (research), checked 2026-09-28 (source 1)
Shock travel
305 mm (12.0 in)
Manufacturer spec sheet (research), checked 2026-09-28 (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

4 of 4 filled

Engine oil spec
SAE 10W-30, JASO T 903 MA
Owner's manual p. 74, checked 2026-09-28 (source 2)
Engine oil capacity
1070 ml (36.2 fl oz)
Owner's manual p. 74, checked 2026-09-28 (source 2)
Coolant capacity
1080 ml (36.5 fl oz)
Owner's manual p. 74, checked 2026-09-28 (source 2)
Fuel capacity
7.1 L (1.88 gal)
Owner's manual p. 73, checked 2026-09-28 (source 2)

Maintenance

2 of 3 filled

Tire pressure (off-road)
15 psi (100 kPa) front and rear
Owner's manual p. 73, checked 2026-09-28 (source 2)
Chain slack
Not yet verified
Spark plug and gap
NGK SILMAR9A-9S, gap 0.80-0.90 mm
Owner's manual p. 75, checked 2026-09-28 (source 2)

Dimensions

3 of 3 filled

Seat height
953 mm (37.5 in)
Owner's manual p. 73, checked 2026-09-28 (source 2)
Wheelbase
1490 mm (58.7 in)
Owner's manual p. 73, checked 2026-09-28 (source 2)
Weight
108 kg (238 lb)
Manufacturer spec sheet (research), 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

10 of 25 fields read off a manual page.

Not yet verified (8): chain links, front rim, rear rim, fork spring rate, shock spring rate, static sag, race sag, chain slack.

From a spec sheet, awaiting a manual page (7): front sprocket, rear sprocket, chain pitch, fork, fork travel, shock travel, weight.

See coverage for every bike

Tools for this bike

Compare with

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 520 Manufacturer spec sheet (research)
Sprockets
Stock front sprocket 13T Manufacturer spec sheet (research)Stock rear sprocket 51T Manufacturer spec sheet (research)
Tires
Front tire 80/100-21 51M Owner's manual p. 73Rear tire 120/90-19 66M Owner's manual p. 73
Engine oil
Engine oil spec SAE 10W-30, JASO T 903 MA Owner's manual p. 74Engine oil capacity 1070 ml (36.2 fl oz) Owner's manual p. 74
Coolant
Coolant capacity 1080 ml (36.5 fl oz) Owner's manual p. 74

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.

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
Setup B — what you are thinking about
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. 1
    American Honda 2027 CRF450R specifications (preliminary)Manufacturer web or spec sheet, research level. Covers stock front sprocket, stock rear sprocket, chain pitch, fork, fork travel, shock travel, weight; checked 2026-09-28.
  2. 2
    Honda 2027 CRF450R/RX/HRC Works Edition Owner's Manual (31MKEA00); owner-supplied copy of Honda's PDFpp. 73, 74, 75Manual page, verified. Covers stock final drive ratio, front tire, rear tire, engine oil spec, engine oil capacity, coolant capacity, fuel capacity, tire pressure (off-road), spark plug and gap, seat height, wheelbase; checked 2026-09-28.

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
All bikes