One thing I have learned in LSR is that there are no
absolutes. Your rain tires worked well on your car, but would
they have done the job on a roadster? Prollly not, based on
opinions/experience from other racers. When I referred to
treaded tires, I meant FULL tread (like street tires) not
grooved tires. While I don't understand all the physics
involved, I know from experience that they won't as well as a
treadless tire (and Joe did understand what I was trying to
say about treads leaving more exposed areas of rubber) Look
on the back of my Vette & you will see 7" Short-track tires
with 3 wide, deep grooves running the circumfrence. I would
have preferred slicks, but Mr. Goodyear doesn't make my
application in a treadless design. I know when I tow to the
line, the grooves pack with salt. Do they clean themselves out
at speed? I don't know, been too busy to look back there & see
if my tires are clean ;-) If the grooves do stay "open" I
would guess that it would be a factor in directional
stability. BTW Mayf, I haven't seen section width running
through your calculation either. That is prolly because nobody
considers it important, but to me it is an aero issue.....
ed (yeah, I know I am rambling again........)
---- Original message ----
>Date: Sat, 2 Mar 2002 00:47:26 -0500
>From: "rgribble" <rgribble@carolina.rr.com>
>Subject: RE: Tires
>To: "'Ed Van Scoy'" <ed@vetteracing.com>, "'DrMayf'"
<drmayf@teknett.com>
>Cc: "'gary baker'" <lsr350@hotmail.com>, "'Rick Byrnes'"
<Rick@rbmotorsports.com>, "'Dave Dahlgren'"
<ddahlgren@snet.net>, "'list'" <land-speed@autox.team.net>
>
>ED,
>I had good results with the treaded tires on the Salt and at
Maxton, but
>that was only up to 226. That was both with rear wheel
traction and with
>front steering control. I don't know if you saw the NASCAR
Rain Tires I
>used buy they had fairly wide open grooves and didn't pack
with salt. Of
>course everything else on the car did!
>
>Am I picturing this wrong or don't you have less rubber in
contact with
>the surface if you have treaded tires (i.e. air spaces in
between)
>thereby decreasing surface area? I guess what I see is the
Rain Tires
>are about 11" wide but have two parallel groves about 1.5"
wide and 1/8"
>deep each. It's almost like having three 2.5" wide tires.
>Grib
>
>"Do what others Won't and you'll do what others Can't for the
rest of
>your life"
>
>
>-----Original Message-----
>From: Ed Van Scoy [mailto:ed@vetteracing.com]
>Sent: Saturday, March 02, 2002 12:02 AM
>To: DrMayf
>Cc: gary baker; Rick Byrnes; rgribble; 'Dave Dahlgren'; list
>Subject: Re: Tires
>
>Mayf,
>Haven't heard any comments about treaded VS slicks (tires) in
>your calculations..... treaded tires increase surface area
>(thus resistance) so that will affect your final numbers. BUT,
>what happens when the treads fill with salt & how do you
>figger that variable in????
>ed (been there with treaded tires - didn't work well)
>
>---- Original message ----
>>Date: Fri, 1 Mar 2002 17:09:54 -0800
>>From: "DrMayf" <drmayf@teknett.com>
>>Subject: Re: Tires
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