UN/STOCKED
Parts catalog — section 13

Drivetrain

Chain, sprockets, and the 520 conversion — the cheapest 'feels faster' money in the catalog. Minus one front or plus two rear wakes up gearing that was chosen for a brochure top-speed number.

$200–$450chainsprockets520 conversion kits
Sec. 13.1

The decision

A 520 kit with a quality chain drops rotating weight and lets you pick gearing per track or per road. Steel rear sprockets last; aluminum saves weight and wears fast — a race consumable, a street compromise. If chain or sprockets are worn, replace all three as a set, always.

Dependencies. Gearing changes throw off the speedometer (and sometimes the gear indicator) on many bikes — a speedo corrector module from the electronics category fixes it.
Sec. 13.2

The brand ladder

Where each name sits on the shelf — market position, not endorsement. Brands appear because their catalogs cover this category.

BrandTierOriginNote
DIDpremiumJPERV-series race chains — what the paddock actually runs.
EK ChainmidJPThe chain half of the standard Vortex 520 kit, from SRX2 value X-ring to MVXZ2 race spec.
VortexmidUSGrippiest pegs in the business, value clip-ons, and the sprocket half of the standard 520 kit.
Sec. 13.3

Representative parts

Typical US street prices for the entries riders cross-shop. Every line is model-specific at checkout — verify fitment for your exact year and market before buying.

PartTierTypical priceFitment
DID ERV7 520 race chainpremium$180universal 520 pitch — cut to your bike's link count
Vortex + EK 520 conversion kitmid$280model-specific gearing — choose sprocket sizes and chain grade at order
EK MVXZ2 520 chainmid$110universal 520 pitch — cut to your bike's link count
Superlite RS8-R steel rear sprocketmid$90model-specific carrier fit — steel longevity at near-aluminum weight
Renthal Ultralight rear sprocketmid$90model-specific carrier fit — pick tooth count for your gearing
Driven EVO aluminum rear sprocketmid$85model-specific carrier fit — aluminum wears faster than steel; track favorite
DID 520VX3 X-ring chainbudget$90universal 520 pitch — cut to your bike's link count
Vortex steel front sprocketbudget$30model-specific spline — the -1 tooth acceleration trick lives here

Run the category search — “motorcycle chain and sprocket kit” — where you already shop:

RevZillaAmazonMotoSporteBay

Some links may earn Unstocked a commission at no cost to you. Prices shown are typical street prices — always verify fitment and price at the retailer. Model-specific parts (exhausts, rearsets, bodywork) can run 2–3× between platforms — the sheet shows a typical figure.

Sec. 13.4

Where it bolts on

These platforms carry drivetrain notes on their build pages — the brands that fit, the year splits, and the gotchas.

Honda

CBR1000RR / CBR1000RR-R

liter superbikeFireblade
Kawasaki

Ninja ZX-10R

liter superbike10R
Aprilia

RS 660

middleweight twin supersportRS660
Honda

Grom

125 minimoto
Ducati

Panigale V4

V4 superbikeV4
Kawasaki

Ninja 400

lightweight sport twinN400

Prices are typical US street prices at publish time and drift with sales and supply — verify at the retailer. Fitment is advisory: always confirm the exact part number for your year, generation and market before buying.