Whats your bike and speed?

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I have a San Remo right now but I will soon be getting a Giant SCR1. On my san remo I averaged about 18-20mph (maybe a bit faster on a good day) on a strait road with little or no wind. Downhill I have hit 42mph as indicated on my speedo. The san remo just doesnt have a high enough gear ration to go much over 35.

Also how much does wearing the skin tight clothing and aerodynamic helmets that racers wear make to your speed?