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Old 10-30-2009, 07:22 PM   #9
Paragon
Airhead Brit
 
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Joined: Nov 2003
Oddometer: 140
Simply put

If you fit the 747 - and if it fits, it will be 3.5% different, (less accurate), than the 773.

i.e. the rear wheel on a standard R80G/S turns 773 times per kilometer and that is why it needs a W773.
The normal R80 rear wheel turns 747 times per kilometer
Don't ask me why they are different

The correct Speedo for a standard R80G/S is W773 or W1244

You should be able to pick one up for under US$100 - used

BM Speedos are not particularly accurate - if you want complete accuracy, use something else
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