Mike ,
What brand Taxi tyres are currently fitted ?
What shock absorbers are currently fitted ?
What tyre pressure do you use?
Over many years I have used the following tyres on my 400 fitted with 4.5 inch wide 401 wheels (the same width as standard 406 wheels)
Pirelli 185/80 x 16 (really too wide for a 4.5 inch rim)
Michelin 175/80 x 16 XC (commercial probably 8 ply)
Bridgestone 175/80x 16
Falken 175x 80 x 16 ( probably 4 ply , very soft and needed high air pressure)
Austone 175/80 x 16 Taxi 6 ply
I have not noticed any difference in the ride/harshness when I changed tyres.
My pick of the above list is the current Austone Taxi , the cheapest , they handle well , quiet , I assume will wear slowly and the 6 ply makes the car stable in strong cross winds.
I would not choose a cross ply tyre for one of my cars ,unless it was destined to sit in a Museum .
My GUESS is that your problems with 406 harsh ride is not the tyres unless they are very old and hard . If so they will need replacement .
I suggest you check the shock absorbers .
Geoff
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