Chain kits
EVGATSAUTO 420 chain kit 37/17
A 420-pitch chain and sprocket kit with 17 front and 37 rear teeth, published for 17 mm countershafts on 50 to 125 cc dirt bikes, mini bikes, ATVs and go-karts.
Specifications
- Pitch
- 420 (from the title)
- Gearing
- 17 teeth front, 37 teeth rear (from the title)
- Front sprocket
- 0.235 inch thick, 17T; centre mounting holes 1.18 inch apart; compatible with 17 mm engine countershafts (maker’s bullet)
- Treatment
- Sprockets heat-treated, stated to increase strength and wear resistance (maker’s bullet)
- Stated vehicles
- 50 cc to 125 cc dirt bikes, mini bikes, ATVs, four-wheel go-karts (maker’s bullet)
- Supplied
- Front sprocket with mounting bolts (maker’s bullet)
- Amazon reference
- B0B2PVTNVP (one reference across 5 Amazon marketplaces)
What the seller commits to paper
420 pitch, 17 teeth front and 37 rear, for 50 to 125 cc dirt bikes, mini bikes, ATVs and four-wheel go-karts.
And for the front sprocket specifically: 0.235 inch thick, 17T, centre mounting holes 1.18 inch apart, compatible with 17 mm engine countershafts. Heat-treated for strength and wear resistance. Supplied with mounting bolts.
The countershaft diameter is the number that decides it
A front sprocket slides onto the gearbox output shaft. Get the bore wrong and it will not go on — that is the whole fitment, and almost no chain kit listing states it.
17 mm is a number a buyer can check against the sprocket already on the machine, with a vernier, before ordering.
The rows this seller leaves empty
The chain length in links. A chain kit is a chain plus two sprockets, and the chain has to be long enough to reach at the axle position the gearing produces. One kit in this family publishes 140 links; this one publishes none.
Reading the gearing
17/37. A smaller front or larger rear gives more acceleration and fewer miles per engine revolution. Changing either from standard changes the speedometer reading as well as the feel.
Availability
Between 31 € and 46 € across the German, French, Italian and Spanish Amazon stores, in the single reading behind this page.
An entry with nobody selling against it sits in the British Amazon catalogue.
Nothing whatever came back from the American Amazon store, so the buy button there opens a search instead of an empty page.
What Keepa returned in the single reading behind this page. Availability and prices move without notice.
Prices quoted in this text were read on 18 September 2026. The live price is at the top of the page.
