Quote Originally Posted by JohnL View Post
The design engineers may have a minimum clearance they never go under as a matter of principle or policy (?).

If other geometries have been altered to address any tramlining issues, I do wonder just what they might be. The only thing that springs to mind might be decreasing scrub radius (associated with wheel offset relative to the steering axis, so could be changed more easily with offset than suspension component alteration), but I'd imagine scrub radius would probably be minimal in the first place (?).

Honda may then choose a wider tyre with a relatively soft sidewall to pre-empt complaints about excessive tramlining, even if this might mean the OEM wider tyre offers relatively little dynamic improvement over the narrower OEM tyre with the taller but stiffer sidewall (??).
I agree. I expect that the Honda design engineers probably do have minimum clearances. They probably designed the Euro to be fitted with 225/45R17 tyres on 7" wide rims at some stage. I think that they even come with 18" rims on some European models (if not optional).

They did alter the suspension of the Luxury compared to the Standard when they introduced the 17" wheel on the Luxury. Who knows to what extent they altered it.

I'm no suspension expert and certainly you sound like you know what you're on about. I've read some of your other posts. I could not begin to know what else they might have altered or what they could alter to counteract tramlining.

One thing is known; wider tyres and straight/hard/square sidewalls = tramlining.

As far as I know, the Bridgestone RE030 fitted to the Luxury is a high performance tyre with straight/hard/square sidewalls. But Luxury owners don't seem to report severe tramlining whereas my Standard fitted with the Honda 17" wheels and 225/45R17 tyres tramlines to a such an extent that I'm driven to distraction.

Honda should not just tell people that the 17" wheel is not to be fitted to the Euro Standard as suggested in another thread. They should say why.