Here is a photo of a mates Sigma taken in the Early 90's I'd say 91/92.
It featured in the then famous fast fours and rotaries but it didn't have Simmons wheels on it instead it had some sort of Centreline wheels.
Sigma with Simmons
Re: Sigma with Simmons
If it's the same car I'm thinking of it featured in "Fast Fours and Rotaries" with the Simmons wheels on it. It made the cover with the heading "Look Who's Torqueing", the car launching on a drag strip (I've got that issue - you reckon I can find it? ) If I come across it I'll scan and post it up.