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Designed and manufactured in the United Kingdom and tried and tested in the Peak District; the Burgtec Thick Thin Oval Direct Mount Shimano Chainring is the perfect upgrade for your 1x drivetrain. Designed with 115% ovality, the Thick Thin Oval chainring reduces the dead spot in your pedal stroke, helping you lay down the power smoother, increasing efficiency as well as improving traction on technical and loose climbs. If you find yourself spinning the back wheel going uphill, you should check this chainring out! You won t need a chain device with the Thick Thin as your chain will be held perfectly in place, no matter how rough the trails get. The Thick Thin Oval Chainring is a perfect low-cost upgrade, offering exceptional durability and performance.All Chain Rings are + / - 2 Teeth so;30T Has a combination of 32T Increased Power Phase and 28T Dead Spot32T Has a combination of 34T Increased Power Phase and 30T Dead SpotWe would recommend sticking to the current sized round ring that you are currently using when selecting your Oval size.Thick Thin Tooth Profile10, 11 and 12 Speed Compatible115 Degrees of OvalityFully CNC Machined from 7075 Aluminium