Burgtec Thick Thin Oval Chainring — Shimano DM 12 Speed

Oval chainrings split opinions, but Burgtec's research landed on 115% ovality — and the results speak for themselves. Through extensive prototype testing, they pinpointed the sweet spot where the dead spot at the top and bottom of your pedal stroke shrinks just enough to get you back into the power phase sooner, without the awkward lunge that plagues poorly tuned ovals. The physics works in your favour: your downstroke generates the lion's share of your power, and the oval profile gives you a bigger effective gear right when you're pushing hardest, then spins the crank back around quickly through the dead spot. More drive, no extra effort — and the same flawless chain retention Burgtec's thick-thin tooth profile is renowned for. All rings run ±2 teeth: a 30T oval delivers a 32T effective gear in the power phase and 28T through the dead spot. Stick to your current round ring size when sizing your oval.

Design Features

• 115° optimised ovality targets the dead spot at the top and bottom of the pedal stroke, returning you to the power phase sooner with no awkward lunge
• Increases your effective gear ratio during the downstroke — where up to 80% of pedalling power is generated — for more drive with zero extra effort
• Thick-thin tooth profile locks the chain in place across 10, 11, and 12-speed drivetrains without needing a chain guide
• Fully CNC machined from 7075 aluminium for a lightweight, stiff ring that holds its shape under hard, repeated pedalling loads
• Shimano Direct Mount interface delivers a clean, secure fitment with no movement or slop
• ±2 tooth design means a 30T oval runs 32T/28T effective range and a 32T runs 34T/30T — size to your current round ring
• Available in nine signature Burgtec colourways to suit any build

Specifications

• Mount: Shimano Direct Mount
• Compatibility: 10, 11, and 12-speed chains
• Ovality: 115 degrees
• Material: 7075 aluminium, fully CNC machined
• Sizes: 30T, 32T
• Weight: 84g
• Colours: Burgtec Black, Race Red, Deep Blue, Purple Rain, Kash Bronze, Iron Bro Orange, Rhodium Silver, Burgtec Bullion Gold, Toxic Barbie Pink