[Fot] How much tyre/wheel clearance on the rear tube shock conversion?

[Jim Prettyleaf]

  Jim,
   
  I have Koni shocks on the rear suspension of my TR-6 autocross car.  These shocks are mounted on the old three piece brackets that were available from Moss Motors in 1994.  The bracket sticks out from the inner surface of the wheel well by 2.15", which is a little bit further than the upper half of the Koni shock tube.
   
  A small amount of tire rub did occur when using the stock aluminum trailing arms and the stock rubber trailing arm bushings.  The rubbing stopped when I made my own three link independent rear suspension that uses spherical rod ends and does not move laterally.  The rear track width, the back-set of the rims, and the width of the tires did not not change when the stock trailing arms were taken off and the new three link IRS was installed.  Minimum clearance between the sidewall of the tire and the tubular shock mounting bracket is currently 1.6", so that means that with the stock setup the sidewall flex plus the lateral suspension motion allowed by the stock rubber bushings consumed the entire clearance.  The car was a handful with the stock rear suspension and the back end kept trying to pass the front; with the new IRS it can be thrown around and gathers up gracefully.  In retrospect I blame most of the bad characteristics on the soft stock rubber trailing arm bushings.
  If you are planning to vintage race or autocross your car I first recommend welding gussets to the mounting brackets for the trailing arms to reduce the probability of breakage and then recommend replacing the stock rubber bushings with solid Nylatron bushings.       
   
  Jim Prettyleaf
  

jim hearn <jimhearn1 at comcast.net> wrote:
  Mike, another way of communicating what I have for space is that right
now with the same wheel and spacers but a 205 tire, I have 3 inches of
clearance between the inside of the tire and the inside of the wheel
well. How much of this space is used up by the gusset mounted Koni? In
other words, how far does the gusset mounted Koni stick into the wheel
well as measured from the back of the wheel well at tire height?
Thanks, Jim


-----Original Message-----
From: fot-bounces+jimhearn1=comcast.net at autox.team.net
[mailto:fot-bounces+jimhearn1=comcast.net at autox.team.net] On Behalf Of
JOSEPH HUGHES
Sent: Saturday, February 23, 2008 4:12 AM
To: Friends of Triumph
Subject: [Fot] How much tyre/wheel clearance on the rear tube shock
conversion?

Not a lot. Depends on the offset of the wheel and the width and profile
of the 225 tyre you are intending using. I have had problems on my
racing TR5 which has this set up using 205 x 60 tyres let alone 225's
and finished up using a spacer to space out the wheel sufficently to
clear the shocker and bracket.
What size wheels are you intending using as the ideal wheel size for a
205 x 60 tyre is 7 inch. Do you need to go wider than that?

Mike Hughes


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