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@hippy
http://www.cyclingtimetrials.org.uk/Information/Procedure/Regulations/tabid/79/Default.aspx
14. Competitor's Machine[B][/B]
Every competitor must ensure that his machine is so constructed, equipped and maintained as to be capable of being ridden on the road safely at all times and in all conditions. The riding position shall be set so that the competitor has good forward vision when in a competitive position. In particular but without prejudice to the general principles of this regulation:
(a) Brake levers must be secured to the handlebars in such a position as to enable the competitor to readily apply both brakes whilst holding the handlebars at their widest point. The width of handlebars shall be no less than 35 cms.
(b) On tricycles and tandem tricycles, two brakes may operate on the front wheel but otherwise the braking systems must operate independently on both front and rear wheels.
(c) Bicycles with a fixed wheel shall have a left hand threaded locking device securing the fixed sprocket. Similarly, tricycles with a fixed wheel shall have a suitable locking device or alternatively shall include an integral system as part of the design. Machines with fixed wheel require only a brake operating on the front wheel(s).
(d) Machines fitted with triathlon handlebars and derivations thereof which have forearm supports, or Spinacci type handlebars without forearm supports, may be used provided that when the rider adopts a competitive position on these bars:-
(i) The wrists are no lower than the elbows.
(ii) The point of the elbow joint is no more than 3cm in front of a line extended through the centre of the machine's head tube.
(iii) The height from the ground to the forearm resting position is no less than 80% of the height of the saddle from the ground.
(e) Tyres shall be in good condition and tubular tyres shall be securely attached to the rims.
(f) Disc wheels or spoked wheels fitted with covers may be used only on the rear of a machine.
(g) Deep section rims, tri-spoke and wheels of a similar design may be used. The front wheel must have at least 45% of the surface area open.
(h) The use of recumbent machines, protective shields, windbreaks or other means of reducing air resistance is prohibited.
*N.B. The "tuck" position is banned because the National Committee believes that its widespread use will not be in the interests of the safety of riders and the welfare of the sport. *
N.B. Disabled riders who are unable to ride a machine that complies with this regulation shall apply to National Committee for dispensation.