When: Wednesday, September 14, 2011
ITV4 highlights: 8-9pm
The general classification is likely to get another shake-up after stage four, which features two first-category climbs as well as several short and sharp tests along the 183.7km route.
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The race reaches its highest point when it scales the Brecon Beacons 126km in, although the racing should come alive on the Caerphilly Mountain, which comes just five kilometres from the finish.
With its 12 per cent sections we’re likely to see several attacks on the ascent before those left behind will have to be fearless on the descent into the finish.
Even if this stage changes little on the GC, the battle for the victory in Caerphilly should be fascinating.
0km Start: Welshpool, Powis Castle 10.15am
23.7km Sprint: Newtown 11.00am
67.8km Sprint: Llandrindod Wells 11.57am
100.3km KoM: Llyswen Hill  12.38pm
126km KoM: Brecon Beacons  1.12pm
153.9km Sprint: Mountain Ash 1.50pm
178.8km KoM: Caerphilly Mountain  2.19pm
183.7km Finish: Caerphilly, Crescent Road 2.26pm