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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,084
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Shouldn't affect the speedo as that is driven off the rear wheel and that doesn't change.
It's only equivalent to a couple of teeth at the rear anyway but you need to watch that you don't make the chain run too tight and also that it doesn't rub on anything either.
Have a search on here as I'm sure someone will have done it!