[Spridgets] Am I running the wrong Speedo drive gear?

[WeslakeMonza1330 at aol.com]

What about the tyre size? 
 
In a message dated 22/06/2012 22:52:13 GMT Daylight Time,  
lists at dinospider.com writes:

If it  helps, my Bugeye with original tach, speedometer, 948, smoothcase,
>>  and 4.22 diff. indicates 4300rpms @ 65 mph.
>>
>> Dave  W.