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Can confirm speeding tickets are costly. Car rental co apprised me that Iceland police had clocked offence (cost of letter €35). Was worried that I had been spotted maxing it out at 160 km/h on several stretches where we had to make back time. Fortunately was somewhere else where I was only ~10% over 90 km/h limit. Still the fine was something like €150.
Seriously, don't be riding the bike on the Ring. You are not going to enjoy it.
I think it’s because if you are caught speeding or being a dick - as a tourist anyhow - they are pretty strict and the punishments are spendy.