Trail & family

Honda CRF450RX

Trail & family, 450cc 4T, 2026

Partly verified

Gearing

4 of 5 filled

Stock front sprocket: 13T; Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Stock rear sprocket: 50T; Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Chain pitch: 520; Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Stock chain links: Not yet verified
Stock final drive ratio: 3.85 : 1; Calculated from the stock sprockets (research-level inputs)

Wheels and tires

2 of 4 filled

Front rim: Not yet verified
Rear rim: Not yet verified
Front tire: 90/90-21; Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Rear tire: 120/90-18; Manufacturer spec sheet (research), checked 2026-09-25 (source 1)

Suspension

3 of 7 filled

Fork: 49mm inverted Showa coil-spring fork; Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Fork travel: 310 mm (12.2 in); Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Shock travel: 307 mm (12.1 in); Manufacturer spec sheet (research), checked 2026-09-25 (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

1 of 5 filled

Engine oil spec: Not yet verified
Engine oil capacity: Not yet verified
Coolant capacity: Not yet verified
Premix ratio: Not yet verified
Fuel capacity: 7.9 L (2.09 gal); Manufacturer spec sheet (research), checked 2026-09-25 (source 1)

Dimensions

3 of 3 filled

Seat height: 958 mm (37.7 in); Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Wheelbase: 1478 mm (58.2 in); Manufacturer spec sheet (research), checked 2026-09-25 (source 1)
Weight: 116.1 kg (256 lb); Manufacturer spec sheet (research), checked 2026-09-25 (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 2026-09-25. Rows marked not yet verified are blank on purpose.

What's missing

0 of 22 fields read off a manual page.

Not yet verified (10): chain links, front rim, rear rim, fork spring rate, shock spring rate, static sag, race sag, engine oil spec, engine oil capacity, coolant capacity.

From a spec sheet, awaiting a manual page (12): front sprocket, rear sprocket, chain pitch, front tire, rear tire, fork, fork travel, shock travel, fuel capacity, seat height, wheelbase, 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 520 Manufacturer spec sheet (research)
Sprockets: Stock front sprocket 13T Manufacturer spec sheet (research)Stock rear sprocket 50T Manufacturer spec sheet (research)
Tires: Front tire 90/90-21 Manufacturer spec sheet (research)Rear tire 120/90-18 Manufacturer spec sheet (research)

6 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
American Honda press release: 2026 Honda CRF450RX Specifications (May 20, 2025)Manufacturer web or spec sheet, research level. Covers stock front sprocket, stock rear sprocket, chain pitch, front tire, rear tire, fork, fork travel, shock travel, seat height, wheelbase, weight, fuel capacity; checked 2026-09-25.

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

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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