I'm in training for my first century in around 4 months.I have a quick question. As a percentage of (your best understanding of) your lactate threshold HR, what would you expect as an average HR for a 'max effort century'?

I have this problem where, when I ride, I just can't slow down (until I wear out). On my last (intended to be) easy ride I ended up riding for 2 hours at an average of 95% of my LTHR (as measured by average HR in a best effort 30 min TT). I was pretty well done in at the end. I seem to have the opposite problem when I train indoors on my spinner bike.

Thanks.

dave