Siku is a German manufacturer of scale model toys, including diecast vehicles.  By the late 70's to early 80's the cars were made 1:55 scale and were mostly all-metal.  The cars to focus on are the ones from the 1980's with the whitewall/deep dish tires.  See image.  These wheels react really well to graphite, and combined with the larger scale and nice weight, make the cars really fast.  Some of these cars though don't fit on the standard orange track, so I'll call out the models that are too wide.

Siku buying warnings;

• Important if you're purchasing these loose, is to avoid any with rust on the wheels.  Need the wheels to be free.
• There are similar looking wheels that have the whitewalls, but are not deep dish (aka flat).  These are not as good.

The whitewall/deep dish wheels is the distinguishing factor

Below you'll find my latest Siku rankings.  Updated as of January, 2023.   I have 18 different models, but there are many more to acquire and several I need to upgrade, so this list will only evolve. 

As of 2/22/23, I recently purchased the Opel Senator, Mercedes Benz 500 SE, the Nissan 300 ZX and an upgraded Camaro Z28.  Just need to arrive in the mail.  Excited to find some potential new elite speed.​

Key notes/considerations:

• I race on a two-lane, 27 foot Magic Derby track (equivalent to about one-third of a mile).  The Derby track is 22% wider than a typical Hot Wheels orange track, allowing me to race some of the wider Siku castings. 
• I categorize my cars into speed tiers with 5-Stars being the best. The 5-star performers all have times under 2.500 seconds. 
• I only count the fastest casting in my rankings for a specific car/brand.  
• I've applied graphite to the cars, which really brings out the speed of the Siku cars.

​Please see information on the home page for more details on testing method, speed tiers, etc.

See the Siku Inventory page for details on call the cars with the whitewall/deep dish wheels.

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My top 5 Siku cars.  Porsche 928 and the 1984 Corvette (both 5-Star performers) and the 4-star Mercedes Benz 190E, Opel Kadett SR and VW Caddy/Pickup.  Note that the Porsche 928 does not fit on a standard orange track. 

Rounding out the top 10:  the 4-star Mercedes 260E Ambulance and the Porsche 911 Turbo.  Plus the 3-star Mercedes 208 School Bus (at 96 grams), the Porsche 959 and the BMW 633 CSI.  Note that the Porsche 959 and Porsche 911 Turbo are too wide for the standard orange track.

The 99 gram VW LT28 Van, the VW 1303 LS convertible, the red Ferrari F40, Porsche 911 Cabrio and the McLaren M8F.  The VW Van, Ferrari and Porsche 911 Cabrio are too wide for the standard orange track.

The last entries are the Audi 100 Avant, the Ford Granada Turnier (with the flat whitewall wheels) and the Camaro Z28.

Fastest Siku Cars 
In-progress

Observations:

• Some great speed with this series with 2 cars as 5-star performers (Porsche 928 and 1984 Corvette) and 5 cars at 4-stars.  The Porsche 928 is tied for the 12th fastest overall car and 3rd fastest Light Heavyweight car.
• All the cars are ranked, so no average or slow models so far
• I purchased most of these new in the blister, but a few were loose.  Among the loose ones were the Mercedes Ambulance, Audi 100 Avant and Camaro.  I just purchased a new Camaro Z28, so anticipating that car to move up significantly.
• All of these cars have a metal base, with the exception of the BMW 633 CSI.  Still, that car was pretty quick regardless.
• The Ferrari F40 has the thicker versions of the fast wheels, which I don't believe as are good.

See the Siku Inventory page for a listing of the cars with whitewall/deep dish wheels.