Also don't be tempted to go too thin on the tyres. If you think the roads are bad on a motorbike, try riding in the gutter on a push bike! Thanks to the buses there are loads of jumbo pot holes, dodgey ironworks and road markings. In traffic you can't always avoid them or dive round them. I also run Michelin puncture proof tyres. They are a bit heavier, but never punctured and means I don't have to carry any tools.
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