Because of all this discussion over the past couple of days while my GL was on the lift in the air I checked mine.  Got it undone and checked the tire - very old and shot.  BUT - the bolt head was 18mm.  Go figure.

Peter Marsh

On Mar 8, 2011, at 1:27 AM, David Beierl wrote:

> At 12:57 AM 3/8/2011, Karl Wolz wrote:
>> Pretty much normal 19mm.
>
> All except it's a much larger (wider) head than usual for the
> diameter of bolt - so that the lug wrench will fit it.  Wish I had one.
>
> Yrs,
> d