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 size 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 August, 2023.   I have 24 different models, but there are many more to acquire and a few I would like to upgrade, so this list will evolve. 

I just purchased the Jaguar XJ6, so anxious to test that casting.  ​

Key notes/considerations:

• I race on a two-lane, 27 foot Derby Magic 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 Siku cars.  All 5-stars.  The Porsche 928, Nissan 300 ZX, the Mercedes 208 van, Peugeot 505 STI, Ferrari 288 GTO and the 1984 Corvette.  Note that the Porsche 928 and Ferrari 288 GTO do not fit on a standard orange track. 

My next best Siku cars:  All 4-star performers.  The Mercedes Benz 190E, the Opel Kadett SR, VW Caddy pickup, Mercedes-Benz Ambulance, Opel Senator and the Porsche 911 Turbo.

Fastest Siku Cars 
In-progress

Observations:

• Some great speed with this series with 6 cars as 5-star performers and 6 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.  That is very impressive.
• There is big upside potential for the Mercedes 260E Ambulance, as this has model has been documented as among the fastest diecast cars.
• All of these cars have a metal base, with the exception of the BMW 633 CSI.  Still, that car was pretty quick regardless.

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