Advice Needed - Biker Chicks

Oh dear. that's a bit inconvenient, even if fascinating! You've got a month or so by the looks of it, a couple of weeks sat on eggs (once they're all laid), then a couple of weeks to fledge. That's going to be the time you'll have to be careful - the male Robin will continue to feed the fledged youngsters whilst Mrs starts a new nest, so your window of opportunity for action will be small. Not sure if she'd re-use the old nest or not, but she's certainly likely to use a similar spot (ie maybe elsewhere on the bike), so you may have to leave the bike outside for a few days until she's set up home elsewhere in the garage.
www.rspb.org.uk/.../