Prohibited Positions and Setups

Anyone competing on the UCI calendar must not only meet the minimum weight – riding position and handlebar setup are equally decisive. The Union Cycliste Internationale (UCI) prohibits certain body positions and technical constructions because they either compromise safety, distort fair competition, or create aerodynamic advantages outside defined limits. What looks spectacular in training videos can lead to disqualification in a race.

This guide explains the most important UCI requirements for prohibited positions and setups – from saddle position to the supertuck to the strict rules for time trial handlebars.

Why the UCI Regulates Positions and Setups

The UCI Technical Regulations (Articles 1.3.013 ff. and 1.3.024 ff.) deliberately distinguish between permitted aerodynamic optimization and prohibited extremes. Four central objectives underpin the regulations:

• Safety – Unstable postures at high speed and in dense packs increase the risk of crashes
• Fairness – No race for the most extreme position or opaque constructions
• Enforceability – Commissaires must be able to identify and sanction violations from the roadside
• Tradition – Cycling remains a sport of athletic performance, not purely an engineering and biomechanics competition

More on the overall context: UCI Equipment Rules in Detail.

Prohibited Riding Positions in Road Racing

Since the early 2000s, the UCI has continuously tightened its stance on extreme body positions. Especially on flat terrain and descents, professionals had used positions that minimized air resistance but limited control over the bike.

The Supertuck (Sitting on the Top Tube)

As of April 1, 2021, the supertuck position is prohibited in all UCI road races. This refers to sitting on the top tube while keeping hands on the handlebars and lowering the upper body close over the frame. The UCI justified the ban with the increased crash risk: in bumps, corners, or braking maneuvers, the rider lacks the usual leverage and stability.

1. Prohibited: Buttocks on the top tube, feet on pedals, hands on the handlebars
2. Permitted: Descending position in the drops with normal saddle contact
3. Permitted: Standing on the pedals in technically demanding sections (when safe)

Puppy Paws and Forearms on the Handlebars

Since 2024, another position ban applies: riders may not rest their forearms or elbows on the handlebars or handlebar extensions while riding in an aerodynamic posture during road races. This position – colloquially called "Puppy Paws" or "Puppy Dog Paws" – mimics the time trial position without the required armrests and associated rules.

Other Prohibited Body Positions

In addition to the current headline rules, further prohibitions have applied for decades:

• Superman position – Lying stretched out with arms extended forward on the bike (historically made famous by Graeme Obree, still not permitted today)
• Positions without hands on the handlebars – Releasing the handlebars in critical race situations (sprint, corners, group riding)
• Dangerous maneuvers – deliberately obstructing others through extreme deviations from normal riding

Position Control During a Race – 5-Step Process

Saddle Position and Frame Setup

Saddle position is one of the most frequently checked parameters during UCI equipment inspections. It affects biomechanics, power transfer, and – indirectly – the permitted handlebar height.

Saddle Setback and Height

According to Article 1.3.013, the front tip of the saddle may lie a maximum of 5 cm behind the vertical plane through the bottom bracket axle. Exceptions exist for anatomically justified special approvals, which must be requested from the UCI commissaire before the race.

1. Measurement point: Front tip of the saddle (not the seating surface)
2. Reference: Vertical line through the bottom bracket axle
3. Tolerance: Strict compliance; no further setback without approval
4. Saddle tilt: Horizontal ± 2.5 degrees (measured along the saddle's longitudinal axis)

Prohibited Saddle and Frame Modifications

• Cut-down or modified saddles that manipulate the measurement
• Non-approved saddle shapes that create aerodynamic advantages beyond pure seating function
• Adjustable saddle clamps that can be adjusted during the race (locking systems must be secured)

More on frame geometry as the basis for setup: Frame Geometry.

Prohibited Handlebar Setups and Constructions

The UCI distinguishes between the road racing bike and the time trial bike. Different but precisely defined limits apply to each.

Road Racing Bike: Handlebars and Width

The 3:1 rule states: No component on the bike (handlebar, seat post, fork, frame tube) may have an aspect ratio greater than 3:1 (depth to width). This is intended to prevent extremely shaped aero profiles that go beyond normal tube shapes.

Time Trial Bike: Armrests and Extensions

Individual time trials have their own detailed requirements for aerobars. These are closely linked to Article 1.3.023 of the Technical Regulations:

1. Elbow rests: Maximum 75 cm in front of the bottom bracket axle (measured horizontally)
2. Handlebar extensions: Maximum 75 cm in front of the bottom bracket axle, ends must not extend beyond the elbow rests
3. Minimum width: Elbow rests at least 18 cm apart (outside edge to outside edge), 30 cm between rest centers often recommended
4. Height adjustment: Armrests must be fixed during the race – no live adjustment

More on aerobars: Aerobars and Armrests. Discipline context: Individual Time Trial.

Prohibited Frame and Wheel Modifications

Road Racing Bike vs. Time Trial Bike – Setup Comparison

Inspections and Sanctions

UCI control of positions and setups takes place on several levels:

Parc Fermé and Equipment Check

Before the start or after the finish, commissaires can inspect bikes in the parc fermé:

• Saddle position with official measuring tool (plumb line at the bottom bracket axle)
• Handlebar width and profile shape (3:1 rule)
• Time trial setup: distances of elbow rests and extensions
• Visual inspection for non-approved fairings or modifications

Live Control During the Race

Position prohibitions (supertuck, Puppy Paws) are primarily monitored visually – via commissaire motorcycle, TV footage, or course marshals. This requires clear internal rules from riders and sports directors.

Checklist: Equipment Check Before a UCI Race

• Saddle setback checked with UCI measuring gauge
• Saddle tilt horizontal (± 2.5°)
• Handlebar width ≤ 50 cm
• No clip-on aerobars on the road bike
• 3:1 profile complied with on handlebar, fork, and frame
• Time trial setup: elbow and extension distances documented
• Team briefing on supertuck and Puppy Paws ban
• Spare bike configured identically to the main bike

Typical Sanctions

Practical Examples from the Professional Peloton

UCI rules have had direct impacts on race tactics and equipment development in recent years:

1. Supertuck ban (2021): Riders like Marco Pantani or Vincenzo Nibali had popularized the low descending position. After 2021, sitting on the top tube virtually disappeared from WorldTour broadcasts.
2. Puppy Paws (2024): Teams had to retrain riders who rested their forearms on the handlebars on flat sections – a position that had been widespread in the peloton until then.
3. Time trial rules: Manufacturers like Specialized, Canyon, and Trek develop frames and armrests to optimally use the 75 cm limit without exceeding it – millimeters decide approval.
4. Saddle setback: climbing specialists with extremely rearward saddle positions regularly apply for medical exemptions with the UCI.

Milestones of UCI Position Rules

Recommendations for Licensed Riders and Amateurs

The same rules apply in national championships and UCI cup races. Starting with non-compliant equipment risks subsequent disqualification – regardless of finishing position.

Season Preparation

• Document bike fitting: Record saddle position and handlebar setup in writing
• Two identical bikes: Main and spare bike with the same measurements
• Training discipline: Avoid prohibited positions in training to correct muscle memory
• Check time trial setup separately: Road bike and time trial bike differ – measure both individually

Common Mistakes Among Amateurs

• Clip-on aerobars mounted on a road racing bike (only permitted in time trials)
• Handlebar wider than 50 cm (the trend toward narrow handlebars is unproblematic)
• Saddle too far back without UCI approval
• Supertuck on descents out of habit – even if commissaires intervene less often in amateur fields, the ban still applies

More on the UCI as rule-making body: UCI – Union Cycliste Internationale. Supplementary to the weight limit: Minimum Weight and Measurement Procedure.

Last updated: July 3, 2026