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Material: 7075-T6 Aluminium
Finish: Hard Anodised
Chain Size: 420
Tooth Counts – Regular Wheel: 36T, 37T, 38T
Tooth Counts – Big Wheel: 41T, 42T, 43T
Colours: Blue, Green, Gold, Red, Silver, Purple
Fitment: Cobra CX50 JR / SR / FWE
Installation: Direct bolt-on, no modification required
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ART - Racing Parts rear sprockets for the Cobra CX50 JR, SR and FWE —
precision-manufactured replacement and upgrade sprockets for the most
competitive 50cc motocross race bike platform in the world. This is the
420 chain version. Art of Racing designs and machines these
in-house, which is why you will not find them anywhere else.
Each sprocket is CNC-machined from high-strength aluminum and hard anodized in
your choice of color. Hard anodizing does more than look good — it hardens the
aluminum surface against wear and holds color through a season of roost and
pressure washing. The sprocket is drilled and machined to Cobra factory
dimensions for a direct bolt-on fit, no modification required.
420 or 415? Both chains use the same 1/2 inch pitch, so tooth
spacing is identical. The difference is roller width — 415 is the narrow chain
(1/2" x 3/16"), 420 is the wider one (1/2" x 1/4"). A 420 sprocket will not
run correctly on a 415 chain, or the other way around. Check the marking on
your chain sidewall before you order. We build both: the 415 version is
here.
Rear sprocket tooth count is the primary way to tune gear ratio on a CX50.
More teeth gives faster acceleration and stronger drive out of corners; fewer
teeth raises top speed. Tight, rutted tracks reward going up. Fast, open
tracks reward going down. Keeping two or three tooth counts in the pit box is
the cheapest real performance change available on a 50.
Key Specifications:
Made by ART - Racing Parts and shipped worldwide from Europe. DHL to the US
typically takes 3-5 business days.
| Nr. of tooths | 42, 43, 36, 37, 38, 41 |
|---|---|
| Bike make | Cobra Moto |
| ART Parts Color | Silver, Blue, Green, Red, Gold, Purple, Black |
We ship worldwide every day. Delivery within the EU is typically 2–3 business days.
Orders shipped to EU destinations qualify for free shipping once the cart subtotal reaches €150. Orders shipped elsewhere are charged carrier rates, calculated automatically at checkout.
You have 30 days from delivery to return any item in original condition. Full policy →
Art of Racing designs and manufactures its own line of CNC-machined motocross components under the ART Racing Parts label. The manufacturing operation is backed by ALFA TEH, a precision CNC company with production experience in aerospace and demanding industrial sectors. Every ART Racing Parts component is designed, machined, and finished in Europe under one roof.
The first prototypes were developed in 2019 by a professional racer and technician working directly with the engineering team. Each design was tested in competition, refined through successive iterations, and not released until it performed in real racing conditions. ART Racing Parts components have contributed to race wins and championship results across European junior motocross competition.
The current product range includes CNC-machined anodised aluminium rear sprockets for Cobra CX50 and CX65, available in multiple tooth counts for gear ratio tuning and multiple anodised colour options. Additional components including triple clamps are produced to the same standard. ART Racing Parts are exclusively available through the Art of Racing dealer network.
| Make | Model | Years | Notes |
|---|---|---|---|
| Cobra | CX50 | 2016–2027 |
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