Specs compared
KTM 125 SX 2027 vs KTM 150 SX 2025
Motocross, stock specs side by side. Each value names the page it came from; a blank on either side stays blank.
Printed differently: engine, stock gearing and weight. The same on both: chain pitch, front tire, rear tire, fork travel, shock travel, premix ratio, coolant capacity and seat height. Checked 25 Sep 2026 and 16 Oct 2026.
| Spec | KTM 125 SX 2027 | KTM 150 SX 2025 |
|---|---|---|
| EnginePrinted differently | 125cc 2T | 150cc 2T |
| Stock gearingPrinted differently | 13T / 50TOwner's manual p. 146 | 13T / 48TOwner's manual p. 134 |
| Final drive ratio | 3.85 : 1Calculated from the stock sprockets | 3.69 : 1Calculated from the stock sprockets |
| Chain pitchSame | 520Owner's manual p. 146 | 520Owner's manual p. 134 |
| Front tireSame | 80/100-21 TTOwner's manual p. 146 | 80/100-21 51M TTOwner's manual p. 135 |
| Rear tireSame | 100/90-19 TTOwner's manual p. 146 | 100/90-19 57M TTOwner's manual p. 135 |
| Fork travelSame | 310 mm (12.2 in)Owner's manual p. 145 | 310 mm (12.2 in)Owner's manual p. 134 |
| Shock travelSame | 300 mm (11.8 in)Owner's manual p. 145 | 300 mm (11.8 in)Owner's manual p. 134 |
| Premix ratioSame | 40:1Owner's manual p. 146 | 40:1Owner's manual p. 33 |
| Coolant capacitySame | 1200 ml (40.6 fl oz)Owner's manual p. 145 | 1200 ml (40.6 fl oz)Owner's manual p. 133 |
| Seat heightSame | 958 mm (37.7 in)Owner's manual p. 146 | 958 mm (37.7 in)Owner's manual p. 134 |
| WeightPrinted differently | 92 kg (203 lb)Owner's manual p. 146 | 92.1 kg (203 lb)Owner's manual p. 134 |
Each value shows where it came from. The bike pages list the document, page and date checked. “Printed differently” only says the two documents print different figures; it is not a judgement of either bike.
Stock sizes at MotoSport. KTM 125 SX: 520 chains · Front tires 80/100-21 · Rear tires 100/90-19. KTM 150 SX: 520 chains · Front tires 80/100-21 · Rear tires 100/90-19. These are affiliate links: we may earn a commission, at no cost to you, and it never changes the specs. Affiliate disclosure.