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@johnQdarwin
cheers feller, after going from duranos to a 320 tpi with butyl tubes and noticing a huge difference in fatigue in my legs after 3 hours of pedalling , im gonna get 3 and stick a spare under my saddle with a co2 canister and some tools .
90+ quid really seems a lot to spend on tyres, but , i definatly noticed a massive difference in rolling resistance and comfort.