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I'm not sure you need a sports bike to have fun. There are mountains in most regions so lots of the roads are very squiggly. They're like B roads, but usually without pot holes. And in the dryer parts there aren't hedges, so you can see through all the corners. The hard part is finding interesting things to do in the evenings.
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Spain is amazing for bikes, I've been all over the north and Pyrenees. Exactly as Nick describes, largely empty, well surfaced screamers. Not been there for 10+ years now but will add the cops can be fucking hardcore if they catch you up to no good. Generally, as long as you behave yourself around the villages and towns, you're golden. Best local food in Europe too.
Saw a video on youtube last week that looked like exactly that, some 600cc sport bikes going for it for around 10 miles between two towns, absolutely on it the whole way, thought nah they must get picked up somewhere, locals enraged etc, but saw a few folk say the same as you, basically no one left in these places to be worth enforcing/bothering them etc.
Might be off to spain end of summer then, might need a faster bike with smooth tyres though.