Our Premium Cyclocross 110/4(bolt pattern) oval chainrings are designed for new Shimano cranks like Dura-Ace 9000, Ultegra 6800, Shimano 5800 and others. Ideal for 1X conversion of your road crank. Narrow-wide chainring. Advantages of our special CX Oval chainrings: *Finest design to provide excellent weight to strength ratio *One of a kind special oval shape (Patent Pending) *Unique Patent Pending narrow-wide teeth profiles to keep your chain in place for minimum 12 months! *Designed to handle mud and grass with ease *Superb quality and great look *You will ride faster using ovals. If you keep using round ring then others will get quicker *Reduces stress on knees and helps to maintain your legs fresher for longer *You will not "feel" the oval shape at all What size should I choose? Most CX riders choose 38T as it is the most versatile option. * 38T Oval ring will suit best someone who uses 37 or 38T chainring currently. While pedaling, you will feel similar effort to the one riding round 37T ring, but you will gain the speed similar to riding 40T chainring. Why our oval chainrings work Our premium Oval chainrings work because a rider does not produce power evenly through a pedal stroke; they maximize the part of the stroke where power is produced and minimize resistance where it isn't. Oval rings make the spin cycle a lot smoother and are easier on legs while climbing. Believe it (or not), but a round chainring doesn't transfer torque to your rear wheel as smoothly as an Oval one. You will actually feel your stroke to be more "round" with an Oval shape than with a round chainring. Why it matters Traction, Traction and Traction. With oval rings rear tire traction improves greatly on loose and slippery terrain. Smoother power delivery to your rear wheel means that you will be able to maintain better, constant cadence; get less stress on the joints (knees) and therefore be able to keep certain level of effort for longer. This results in higher average speed. Moreover, 11 studies made by various Universities in the World show that using oval chainrings human legs utilize more muscle groups (compared to round one), but each of them to lesser degree. Load from pedaling an oval chainring is spread over greater muscle mass which in effect gives you the feeling of fresher and more relaxed legs. It is world's finest oval chainring backed by tens of thousands of customers. How to mount 110/4 Oval chainring: First you need to remove crank from the bike. Once removed, unscrew 4 bolts that hold two rings together with T-30 torx key. Take off both original rings. Position Absoluteblack oval chainring in place where the small chainring was (inside position). Please note that small indicator on the chainring Must sit behind crank arm - same way as original chainring indicates its position. You will need new SHORT bolts to mount your new ring. Close back those four bolts with force of about 5-7Nm. Mount your crank back to the bike. Done.