From the WB website:
"Revo 2" tubular front track disc.
£529.00 (Sold out)
The Revo 2 track disc wheel has been developed with cost in mind, to give the best performance gains per £pound, unlike our Revo 1 disc where the highest possible performance is the ultimate goal regardless of cost. This wheel is ideal for riders looking to still make big gains in speed over non disc wheels but at a more affordable price. The Revo 2 still has great performance properties that would match many known brand disc wheels. Please note that this is designed for track use only and is not meant for use with brake calipers.
http://www.ebay.co.uk/itm/Walker-Brothers-Revo-2-Track-Disc/192340381532
Walker Brothers Revo 2 Track Disc (Tub).
Cheaps
From the WB website:
"Revo 2" tubular front track disc.
£529.00 (Sold out)
The Revo 2 track disc wheel has been developed with cost in mind, to give the best performance gains per £pound, unlike our Revo 1 disc where the highest possible performance is the ultimate goal regardless of cost. This wheel is ideal for riders looking to still make big gains in speed over non disc wheels but at a more affordable price. The Revo 2 still has great performance properties that would match many known brand disc wheels. Please note that this is designed for track use only and is not meant for use with brake calipers.
Specifications:
Alloy tubular rim
Weight: approx 1250g
Miche Primato 7075 alloy hub
6091 sealed bearings
Hollow lenticular construction
True tolerance +/- 0.5mm
Round tolerance 1mm
120mm rear spacing