I'm 30 year old. I don't see 20mph average as excellent. HRM arriving today / tomorrow. 20mph average comes from traffic lights, roundabouts and cruising at 23-24mph on the flat and dropping down to 16-18mph into the wind and uphill.

My mtb only weighs 17lbs and I'm running slicks - Can't see that would give any more of a penalty than 1mph over a racing bike.

Been riding pretty much the same route mon-fri for 18 months. Started increasing my mileage and the results are amazing. Last night went out for a 28 mile ride (usual length is 13.5miles). Averaged 19.2mph. Training for a sub 5 century.

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"Ride it like you've just stolen it!"