I have always thought that the 185-15's Redlines were equivalent to a
185-78-15.
Bob Kramer, Austin TX
Hill Country Triumph Club
TR6x3, TR250 x3, TR3A vintage race
rgk@flash.net
----------
> From: Darrell Leach <Triumph_TR4@ridgecrest.ca.us>
> To: triumphs@autox.team.net
> Subject: Re: Tyres for TR6
> Date: Wednesday, May 13, 1998 8:12 PM
>
>
> >several snips included
> >>And a couple of things about speedo error. I don't know the
original
> >>tire (tyre) size for the TR-6 but if it was a 185/80/15 the
following
> >>shows the speedo errors for some other sizes. These are
aproximates,
> >but
> >>they should be close.
> >
> >>The formula for this is:
> >>(Original Tire Diameter/Replacement Tire Diameter) x Indicated
Speed
> >
> >Is this formula backwards?
>
> Yes the formula is backwards, A slip of the keyboard.
> But the Chart shows correct numbers, note that the shorter tire
> has a higher speed indicated.
>
> >>Speed at
> >>Indicated Approximate
> >>55 MPH. Tire Diameter (inches)
> >
> >>55 185/80/15 26.6
> >>60 185/65/15 24.5
> >>56 205/70/15 26.3
> >>59 205/60/15 24.7
> >>54 215/70/15 26.9
> >>57 215/65/15 26.0
>
>
> So Long,
>
> Darrell Leach, KD6LRC DM-15, Ridgecrest, Ca
> email: Triumph_TR4@ridgecrest.ca.us
> http://www.ridgecrest.ca.us/~token/PAGE1.html
> 1962 TR-4 (CT5368LO) Everyday
> 1962 TR-4 (CT13108L)
> 1965 Spitfire Mk 2
> 1967 Spitfire Mk 3 In work, lots of 1500 stuff
> Keeper of the TR-4 List, Version 2.0 availible.
>
>
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