**Competition Rules**:
– Bike trials involve riding pre-marked sections to accumulate the fewest points.
– UCI and BIU enforce official competition rules, with a maximum of 5 points per section.
– Points are gained for actions like putting a foot down or exceeding time limits.
– UCI penalizes touching objects, crossing boundaries, and walking through sections.
– BIU rules allow bike parts to rest on objects without penalties.
**Bike Design**:
– Trials frames lack seats for lighter weight and better rider movement.
– Frames prioritize low height, high BB spindle positioning, and reinforced disc brake mounts.
– Materials used for trials frames include aluminum, steel, titanium, magnesium, and carbon fiber.
– Trials brakes emphasize stopping torque over smooth halts, with options like hydraulic rim brakes and disc brakes.
– Rim grinding is common to enhance rim brake performance, offering better wheel control and customization options.
**Competition Categories**:
– UCI hosts the Mountain Bike & Trials World Championships annually, offering mod and stock categories.
– BIU rules are specific to bicycle trials competitions.
– Interscolar competitions follow BIU rules and are limited to club or school members.
– Participants in Interscolar events aim to teach lower-level students how to compete.
**Trials Bike Components**:
– Trials bike wheels feature wide rims for lower tire pressure, heavy plastic rim strips, and thicker tires to resist punctures.
– Trials hubs have cutouts for weight savings, snail cams for chain tension, and modern 135mm hubs with high torque capacity.
– Gear ratios in trials bikes typically have one gear, varying based on wheel size and rear cog size selection.
**Bike Models and Course Design**:
– Different bike models like 20′ Mod Bikes, 26′ Stock Bikes, and 24′ Street Trials Bikes cater to specific riding styles.
– Course design for trials riding includes UCI regulations specifying course requirements, obstacle jump heights, and section completion order.
– Street Trials, a non-competitive variant, focuses on urban features, precise bike control, and balancing skills inspired by riders like Ryan Leech.
