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Hi, getting back to 19" wheels, I'm wondering if the PO did change the speedometer or not.
What's on the bike now is 15/12 ratio with with BG 5330/171.
Is it OK for a 19" rear wheel?
The 15/12 ratio can also be…
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The 15/12 ratio can also be presented as 1.25:1, which is the correct ratio for the Commando 19” rear wheel. So yes, your current speedo drive is okay to use.