thirdcrank wrote:IME, even the eventual sub 20 miles each way is more than a no brainer. This isn't simply a matter of how far/ fast you can ride a bike: they are relatively minor factors; it's more about the time involved on the same route day after day. Particularly in winter, when rain seems to multiply the punctures and salt grinds away at everything else, there's also quite a commitment to maintenance and a bit like feeding the horses before you do anything else, unless you sort everything for your bike immediately, you'll end up forgetting it till it's time to wheel it out.
It's almost 20 years since I retired but until I did so I was a keen and regular commuter by bike. There's loads to be said for it, not least the way that after the first few pedal turns on the way home, the cares of the day disappear but there's a limit. I'm not so daft as to say that 20 miles each way daily is impossible, just that it's not a no-brainer. From the few people I know who have tried something like that long-term, rather than just for a week or two, it becomes to be less about cycling and more a search for ways to get round it eg sleeping overnight at a friend's house, making an exception and catching a train, which becomes less of an exception and more the rule.
This in absolute spades. Mine is 14 miles each way, relatively hilly (can't do less than 600' ascent inwards, 800' homewards). Especially during the winter I tend to take the train for most of it, leaving a total of 10 miles to ride at each end of each train. The full 30 takes a toll. You wake up not wanting to do it. You don't get out at the weekends for leisure rides because you're sick of the sight of the thing. Sick of the same roads over and over again. Rotten choice of the same bloody roads or a more interesting route that might be over 1000' of climbing over the same distance or more.
The irony. I got into cycling again to do this commute, and it's the thing most likely to make me give up.
As regards the proposed 100 mile a day commute? Stark staring bonkers, unless you're some kind of super-athlete, frankly.