Burgtec Thick Thin Oval Chainring 104mm BCD

The Burgtec Thick Thin Oval Chainring puts physics to work for you. Through extensive prototype testing, Burgtec landed on 115° of ovality — measured from top centre — as the sweet spot that shrinks the dead spot, maintains flawless chain retention, and delivers a genuine mechanical advantage on every pedal stroke. The oval geometry effectively gives you a bigger gear through the power phase (downward stroke) and a smaller gear through the dead spot, so you get back into the power phase faster with less wasted effort. Fully CNC machined from 7075 aluminium and built for 104mm BCD cranks, this is an upgrade that works with your body, not against it.

Design Features

• 115° of ovality from top centre — optimised through real-world testing to maximise power phase advantage and minimise dead spot
• Oval geometry adds effective gearing: a 32T ring delivers 34T in the power phase and 30T through the dead spot for no extra effort
• Thick Thin tooth profile with mud bleed channels ensures reliable chain retention in all conditions without a chain guide
• 10, 11 and 12-speed compatible — works with your existing drivetrain
• Fully CNC machined from 7075 aluminium for a stiff, lightweight and durable construction
• 104mm BCD 4-bolt fitment suits a wide range of MTB cranks

Specifications

• BCD: 104mm (4-bolt)
• Available sizes: 30T, 32T
• Speed compatibility: 10, 11 and 12-speed
• Ovality: 115° from top centre
• Material: 7075 aluminium