Well the good news is it’s neither a Redback nor a Funnel Web Spider, so it’s extremely unlikely to have a serious effect if you’re bitten. I can’t tell exactly what it is, but it’s not a deadly spider. You can use a stick and ice-cream container to get it off and reposition the spider in your yard. If you want to prevent spiders from nesting on your bike again, use a residual crawling bug spray (you can find these at Bunnings or Colesworth) every six months or so in the affected areas. That should keep them at bay.