Smoker Performance #219 Ultra-Light One-Piece Sprocket (full & half tooth)

This one-piece #219 sprocket from Smoker Performance is machined from 7075 aluminum and is a full 1 mm thinner than standard sprockets. The thinner profile cuts rotating mass and reduces chain-side friction while the lightening holes drop weight even further. Beginners will notice quicker acceleration and easier gear-ratio changes. Experienced racers get a measurable drop in unsprung weight for faster lap times.

Do you need anodize?

High RPM 2 Stroke, recommended.. but hard anodizing grows a dense aluminum-oxide layer into the gear surface. That oxide is much harder than bare 7075, so tooth flanks and hole edges resist chain rub and handling marks. On 7075 the same process also changes the color from natural silver aluminum to a light gold tint. Unfinished 7075 stays silver. Choose anodize if you want the harder surface and the gold look.

Browse the full Smoker Performance sprocket & gear lineup.

Designed exclusively for the Smoker Mini Sprocket Hub and 200 mm or 220 mm carbon-fiber guard, it delivers a complete rear-drive assembly weighing just 415 g (14.65 oz). Full-tooth sizes run 67T to 85T. Half-tooth sizes run 67.5T to 84.5T. Pick either in the dropdown above.

• Chain Pitch: #219
• Material: 7075 aluminum
• Thickness: 1 mm thinner than standard #219 sprockets
• Full-tooth range: 67T to 85T
• Half-tooth range: 67.5T to 84.5T
• Full system weight: 415 g (14.65 oz) with hub and guard
• One-piece design for simple install
• Optional hard anodize: light gold tint vs natural silver 7075

How half-tooth gears work

There is no missing half of a tooth. A 72.5T gear is a full ring of teeth whose rolling diameter sits between a 72T and a 73T. The tooth profile is laid back a small amount so a standard #219 chain still seats in each valley. The result is a true half-step in ratio without changing the clutch driver.

That extra precision matters. One full rear tooth is a big jump in acceleration and top speed. A half-tooth lets you add drive off a tight corner without killing the straight, or take a little drive out without going slack on exit. Keep the same front sprocket. Swap only the rear. Example: if 72T is a little short and 73T is a little tall, run 72.5T.

Asking again, Do you need anodize?

Yes on high rpm 2 stroke.. but also not if the chain stays clean and nano-coated. Tungsten disulfide (WS2) is a dry-film lubricant first developed for NASA space hardware. Race shops later used factory WS2 coatings on engines, gears, and bearings because the film is only about half a micron thick and handles high load. We sell the same chemistry as a 90 nm powder you can wax into a #219 chain at home. Use our 1 oz (28 g) 90 nm WS2 nano lubricant and follow the #219 / #35 chain wax tutorial. Once the chain is waxed with WS2, we do not even spray lube on our 4-cycle chains. It works that well.

Gears do not need anodize hardening if you keep the chain WS2-waxed and clean. Add anodize if you let the chain run dirty, gunky, and turn very high rpm. If the wax method feels like too much, use HP Chain Lube 12 oz aerosol. That is the simple favorite.

One last comment

You will be amazed at how good the WS2 chain wax works, especially for 4-cycle racing. Actual watt savings and HP gain come from a lower coefficient of friction. Don't believe us? Read it yourself. Plenty of studies are out there for bicycle racing and chain lubricants.