The Garage

Motocross

Stock-size parts in stock at MotoSport

Husqvarna TC 125 2026

Motocross, 125cc 2T, US version

Verified

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

From the owner’s manual: premix 40:1, p. 141; coolant 0.95 l, p. 140; front tire 80/100-21 51M TT, p. 141; rear tire 100/90-19 57M TT, p. 141. Checked 16 Oct 2026.

No CPSC recall found for the 2026 Husqvarna TC 125, checked 2026-10-15. Recalls

Spec card PDF

Gearing

4 of 5 filled

Stock front sprocket
13T
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 source [1]
Stock rear sprocket
50T
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 source [1]
Chain pitch
520
Calculated, not printed: The trade name of the printed size 5/8 x 1/4" · Manual p. 140 · checked 2026-09-27 source [1]
Stock chain links
Not yet verified
Stock final drive ratio
3.85 : 1
Calculated, not printed: Calculated from the stock sprockets, printed on manual p. 140

Wheels and tires

2 of 4 filled

Front rim
Not yet verified
Rear rim
Not yet verified
Front tire
80/100-21 51M TT
Verified, read off the manual page: Manual p. 141 · checked 2026-09-27 source [1]
Rear tire
100/90-19 57M TT
Verified, read off the manual page: Manual p. 141 · checked 2026-09-27 source [1]

Suspension

6 of 7 filled

Fork
WP XACT AER
Verified, read off the manual page: Manual p. 142 · checked 2026-09-27 source [1]
Fork travel
305 mm (12.01 in)
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 source [1]
Shock travel
293 mm (11.54 in)
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 source [1]
Stock fork spring rate
Not yet verified
Stock shock spring rate
39 N/mm
Verified, read off the manual page: Manual p. 143 · checked 2026-09-27 source [1]
Static sag, bike only
35 mm (1.38 in)
Verified, read off the manual page: Manual p. 143 · checked 2026-09-27 source [1]
Race sag, rider on
105 mm (4.13 in)
Verified, read off the manual page: Manual p. 143 · checked 2026-09-27 source [1]

Fluids and capacities

3 of 3 filled

Coolant capacity
0.95 l (≈ 32.1 fl oz, converted by MotoXSports)
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 source [1]
Premix ratio
40:1
Verified, read off the manual page: Manual p. 141 · checked 2026-09-27 source [1]
Fuel capacity
7.2 l (≈ 1.90 gal, converted by MotoXSports)
Verified, read off the manual page: Manual p. 141 · checked 2026-09-27 source [1]

Service specs

6 of 6 filled

Gearbox oil
0.8 l (0.21 liq. galUS); Engine oil (15W/50), Partially synthetic
Verified, read off the manual page: Manual p. 140 · checked 2026-10-16 source [1]
Fork oil
Fork oil (48601166S1) (SAE 4): left outer assembly 240 ml (8.12 fl. ozUS); right outer assembly 240 ml (8.12 fl. ozUS); right cartridge 370 ml (12.51 fl. ozUS)
Verified, read off the manual page: Manual p. 142 · checked 2026-10-16 source [1]
Brake fluid
DOT 4 / DOT 5.1
Verified, read off the manual page: Manual p. 154 · checked 2026-10-16 source [1]
Coolant type
COOLANT M3.0, recommended supplier MOTOREX®
Verified, read off the manual page: Manual p. 154 · checked 2026-10-16 source [1]
Fuel octane
Super unleaded (98 octane)
Verified, read off the manual page: Manual p. 152 · checked 2026-10-16 source [1]
Idle speed
1,400 rpm … 1,500 rpm (23.33 Hz … 25.00 Hz)
Verified, read off the manual page: Manual p. 139 · checked 2026-10-16 source [1]

Maintenance

3 of 3 filled

Tire pressure (off-road)
1.0 bar (14.5 psi) front and rear
Verified, read off the manual page: Manual p. 141 · checked 2026-09-27 source [1]
Chain slack
55-58 mm (2.17-2.28 in)
Verified, read off the manual page: Manual p. 77 · checked 2026-09-27 source [1]
Spark plug and gap
NGK BR10 ECMVX, gap 0.80 mm
Verified, read off the manual page: Manual p. 139 · checked 2026-09-27 source [1]

Dimensions

3 of 3 filled

Seat height
946 mm (≈ 37.2 in, converted by MotoXSports)
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 source [1]
Wheelbase
1490 mm (≈ 58.7 in, converted by MotoXSports)
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 source [1]
Weight (weight without fuel approx.)
92.2 kg (≈ 203 lb, converted by MotoXSports)
Verified, read off the manual page: Manual p. 140 · checked 2026-09-27 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 2026-10-16. Rows marked not yet verified are blank on purpose.

Buying parts

The stock sizes and specs this bike left the factory with, each with its source. Take them to any shop.

Retailer links below are affiliate links: we may earn a commission, at no cost to you, and it never changes the specs. Affiliate disclosure.

Chain
Chain pitch 520 Owner's manual p. 140520 chains at MotoSport520 master links at MotoSport
Sprockets
Stock front sprocket 13T Owner's manual p. 140Stock rear sprocket 50T Owner's manual p. 14013T front sprockets at MotoSport50T rear sprockets at MotoSport
Tires
Front tire 80/100-21 51M TT Owner's manual p. 141Rear tire 100/90-19 57M TT Owner's manual p. 141Front tires 80/100-21 at MotoSportTubes 80/100-21 at MotoSportRear tires 100/90-19 at MotoSportTubes 100/90-19 at MotoSport
Coolant
Coolant capacity 950 ml (32.1 fl oz) Owner's manual p. 140Coolant at MotoSport
Suspension springs
Stock shock spring rate 39 N/mm Owner's manual p. 143Suspension at MotoSport

In stock at MotoSport

Prices from MotoSport’s catalog of Oct 26, 2026; check today’s price before you buy.

Front tire, stock size 80/100-21

Rear tire, stock size 100/90-19

Prices and stock from MotoSport's product catalog on Oct 26, 2026; they change, so check the price at MotoSport before you buy. Products are chosen by exact stock size, code or oil viscosity from the specs above, known brands first, then price. We have not tested them.

2 part specs not yet verified; see data coverage.

Tools for this bike

Compare with

Comparisons with other bikes use the newest model year on file: Husqvarna TC 125 2027.

Other model years

2026 vs 2027, side by side

Service schedule

58 rows from the owner's manual schedule, pp. 34-36, counted in hours, at these intervals:

  • After one operating hour
  • After 15 operating hours / Every 15 operating hours
  • Every 45 operating hours
  • Every 90 operating hours
  • Every 24 months

Check what's due or track it in My Bike. Buying one used? The hours check lists what the schedule calls for by its meter reading.

Gearing calculator

Gearing for this bike

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 8–16 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—
Ratio change—
A —
B —
Taller · more speed Shorter · more pull

—

Changing the rear sprocket changes the chain length too. The chain length calculator works it out from the chain you have now, with where the axle ends up.

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

What's missing

26 of 30 fields read off a manual page.

Not yet verified (4): chain links, front rim, rear rim, fork spring rate.

See coverage for every bike

Sources

  1. 1
    Husqvarna Owner's Manual 2026 TC 125, Item no. 3402882en (19/08/2025); owner-supplied copy from the KTM Group print-on-demand portalpp. 77, 139, 140, 141, 142, 143, 152, 154Manual page, verified. Covers stock front sprocket, stock rear sprocket, chain pitch, front tire, rear tire, fork, fork travel, shock travel, stock shock spring rate, static sag, bike only, race sag, rider on, coolant capacity, fuel capacity, premix ratio, tire pressure (off-road), chain slack, spark plug and gap, seat height, wheelbase, weight (weight without fuel approx.), weight, as labelled, gearbox oil, fork oil, brake fluid, coolant type, fuel octane, idle speed; checked 2026-10-16.

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.

Your manual prints something different? Report a value with the page it is on; every fix is listed in the corrections log.

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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