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Cheers. That confirms that one tooth less on the front sprocket is exactly the same result as 3 more on the rear
I'd rather go that way too if the alternative rear sprockets are available. That option should give the chain an easier life too.
I feel that 1100 is way over geared, I rarely get above 4th gear unless on a dual carriageway or motorway (which I avoid) so I'm thinking...