RE: [ST] Front Tire Wear

["Ken Mitchell" <kp.mitchell@xxxxxxxxxxx>]

I'm not implying that pressure has anything to do with cupping, quite the
opposite in fact.

In my experience, tire pressure DOESN'T affect life of the tire nor cupping.
I used to get bad cupping on fairly new Dunlop K70's on my '73 Bonneville,
but never saw it again until Bridgestone BT-020's on my RS.

Damned if I know what really causes it, but my suspension guy (P. Kates at
GMD Computrack Boston) says it's caused by tire design, and worsened by poor
damping of the forks. I know this was true of my cars back when I was poor,
driving well-used sh*tboxes that desperately needed new shock absorbers.

I might theorize that a lower pressure would help in damping tire bounce,
reducing cupping. I really think it's more a characteristic of a particular
tire design, and BT-020's are one of those.

Purely anecdotal analysis, with no basis in fact. ;)

Ken M.
'00 RS
Spencer MA USA

- -----Original Message-----
From: Neil Lindsey
Subject: Re: [ST] Front Tire Wear

Ken,

Would you mind elaborating a bit on how to tire pressure affects cupping?

It  sounds a little like you are suggesting that lowering the pressure a bit
can help stretch front tire life expectancy.

Or does lowering the pressure actually improve how a cupped front tire
behaves (and not necessarily the mileage you'll get)?

I've always kept the front pressure at the recommended 36 psi to the bitter
end.

Neil


- ----- Original Message -----
From: Ken Mitchell
Subject: RE: [ST] Front Tire Wear


> <snip>

> The front may not be down quite to the wear bars, but it will continue 
> to cup worse and worse no matter what pressure you run. (Assuming you 
> keep in in the safe zone of 32-38 psi.)
>
> <snip>




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