VG he probably does think you're wonderful, it's just he adores cycling too. It seems to easily become an obsession (another cycling widow here). My solution was to allow DH to get DS into cycling too, and now they go off together and leave me to do what I want. (I like time on my own, and don't get much, as DH and I both work from home!). I have it easy though, as only have one DC.
As for family time, I've instigated a non-negotiable movie and pizza night once a week (usually Fridays). It's not much, but it's better than it used to be, as I have the added problem that my DH is self-employed, so no cut-off for when to stop work, and he helps run several cycling clubs/organisations!!
As a compromise, I also go to watch DH and DS race sometimes, which is a 'if you can't beat 'em, join em' approach. If you are into cycling, can't you persuade your DH to do family rides? If DC are still little, a good tagalong bike works wonders. You could ride to a nice cafe and have lunch together.
Also, if we're going to my sisters or my mums, say, for lunch, he will often ride there (they both live around 20 miles away) while I drive, then he gets some miles in, and it doesn't really affect the family time bit.
I realise none of this addresses the fact that he disappears for 8 hours without bothering to tell you. You definitely need to play him at his own game and disappear off out early on a Saturday (without mobile) and leave him with the kids til you feel like coming back. That should open up a bit of a dialogue 