[TR] TR4 Compression and Wheels

[GHaynesTR4 at aol.com]

List,
In my experience, TR4 compression readings in the 185 to 200 psi range 
indicate some head milling has been done.   My own TR4A measured 210 after 
milling the head and I suspect my milling job was the second, making the 
compression too high.   For a few years, I used two head gaskets to reduce the 
compression to a point where reasonable ignition timing could be set without 
pinging.   Finally swapped heads.
Regarding the wheels:   the only 4.5" wide wheels I have ever seen on a 
Triumph were 60-spoke wires.
All TR3 and TR4 steel wheels were 4.0" wide.   Can't say that I've seen it 
all, but there's about 40 years' of tire changing to go by.   The 205/75R15 
tires were an absurd choice on such a narrow wheel, perhaps all that was 
available at the time.    Not looking for a p...g contest here, just sharing my 
experience.
George