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Wind resistance.
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If you're going to carry the 'cross tyres anyway (and going off-road) - I'd just stick them on and save yourself the bother!
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If I was riding 100 miles on roads, and wanted to off-road a bit somewhere once there, and riding a touring bike which you'll be carrying things on anyway I'm guessing - take the off-road tyres and use the slicks for the 100 road miles (cycling 100 miles back too?). A couple of tyres won't make a weight difference, and only takes a few minutes to swap them. Also depends how knobbly the cross tyres are. If you ride them loads on the road it might just wear them down needlessly. Make sure you've got the correct sized inner tubes if the tyres are different widths too. If you have time and money to spend on new tyres, a hybrid like miro suggested might be good too. Or just save £30-40 and take the spare set.
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miro_o
Ratty
Chris.
@William.
Tyre question:
Just choosing tyres for a 100 mile ride on the tourer tomorrow. Should I run my heavy but slick puncture proof touring tyres, or my light but knobbly 'cross tyres? What's more important, rolling resistance or weight? (I'll be going off road a fair bit once I'm there, so might carry the 'cross tyres with me anyway)