Lawn Bowls Bias Guide and Trajectory Charts

Trajectory guides for the most popular lawn bowl brands: Drakes Pride, Taylor, Henselite, Aero, and Biased Bowls.

In this guide we hope to give you some insight into the different bias profiles for some of the most popular bowls models on the market. We currently have guides for the biggest makers in the UK today: Taylor, Drakes Pride, Henselite, Aero, and Biased Bowls.

Each guide will show the amount of bias through the size and depth of the curve. All guides are colour coded to help compare models within each brand; however, these are just a guide and individual green conditions will affect the exact path.

The guides currently do not consider the subtle line profile differences in turn timing. For example, Aero bowls often start to turn earlier than other makes.

Trajectory guides are essential to help make an informed decision on what model to buy. It can be quite confusing when you have so many models to understand which one best fits your needs.

Many bowlers have a preference for a specific brand, so we have split our charts accordingly. Below you will find a chart for each of the major UK brands - Aero, Drakes Pride, Henselite, Taylor, and Biased Bowls.

Before we look at the different charts, let's review what bias is and how it works.

Lawn bowls bias explained

Lawn bowls are not perfectly round. One side is shaped differently to create a bias, causing the bowl to curve gently towards that side as it slows down. A bias is engineered by a manufacturer to produce a specific trajectory tailored to different greens and player positions.

Aero bowls bias chart

Aero produces precision-engineered models suitable for both indoor rinks and outdoor greens. The chart below illustrates the relative draw line and bias curves for popular models such as the Quantum, GrooVe, and Sonic.

Trajectory guide and bias chart for Aero lawn bowls (Quantum, GrooVe, Sonic)

On the draw shot, Aero models begin turning approximately halfway between the mat and the jack. Aero also provides specific outdoor recommendations categorised by green speed tolerance:

Trajectory guide and bias guide for Aero lawn bowl outdoor models (MaXim, Sonic, GrooVe, Quantum)

Drakes Pride bowls bias chart

Drakes Pride models can be played both indoor and outdoor, with the exception of the XP model.

The wider trajectory makes the XP model perfect for play as a skip, or for playing on heavy early-season greens. The Professional remains an industry standard all-rounder, while the D-TEC offers a tighter line for indoor carpets and faster outdoor greens.

Trajectory guide and bias chart for Drakes Pride lawn bowls (D-TEC, Professional, PRO-50, XP)

Henselite Bowls bias chart

Henselite are one of the most trusted and historic brands of bowls in the world.

Their Tiger and Tiger II models can be seen on almost every club green across the UK. Their range also caters to slick indoor rinks with the tighter Tiger TX, up to the broader-swinging original Tiger.

Trajectory guide and bias chart for Henselite lawn bowls (Tiger TX, Tiger II, Tiger Pro, Tiger EVO, Tiger)

Taylor Bowls bias chart

Taylor offer a comprehensive line of models covering every surface speed and position. Whilst models are versatile across indoor and outdoor greens, narrower models like the Lazer and Vector VS excel indoors, the Ace and Blaze provide dependable all-round versatility, and the Legacy SL and Lignoid deliver generous draw arcs for heavier greens.

Trajectory guide and bias chart for Thomas Taylor lawn bowls (Lazer, Vector VS, Blaze, Ace, International, Legacy SL, Lignoid)

Biased Bowls bias chart

Biased Bowls is a contemporary manufacturer bringing modern engineering and motorsport-inspired design to lawn bowls. Manufactured in partnership with Taylor, their models feature distinctive bias trajectories engineered specifically for modern game situations.

Their two flagship models are the Racing Line, offering a tighter, highly controllable arc suited for lead play and fast surfaces, and the Torque, a versatile mid-biased bowl engineered with a smooth, predictable finish across both indoor rinks and outdoor greens.