Elliptical 110 BCD Assymétrique 4-Vis pour Pédaliers Shimano – WolfTooth Components

More power? Check. Better traction? Definitely. Less shifting? Yup. Funky uneven pedal stroke? Not with Wolf Tooth’s PowerTrac Elliptical™ (PTE) Couronnes. Our proprietary design means a slightly less ovalized ring (10%) with less aggressive timing (112°) than competitors’ versions; any change to your pedal stroke is unnoticeable pour most riders, but they still provide the POWER and TRACTION benefits inherent to oval Couronnes.  It’s like having two Couronnes in one! With PowerTrac Elliptical rings, the larger-diameter section of the ring engages with the chain at the optimal point on the downstroke, or “Power Zone,” – between 1-5 and 7-11 on a clock face – to take advantage of your body’s natural biomechanical POWER: pour example, during this section, a PTE 34t ring is equivalent to a 36t round ring. Similarly in the “Recovery Zone” (11-1 and 5-7), the smaller section on the PTE ring engages, maximizing EFFICIENCY in the weakest part of the pedal stroke; here the PTE 34t ring is equivalent to a 32t round ring. Additionally, the above provides a smoother, more efficient pedal rotation, which means better TRACTION. Steadier torque on the rear wheel means less spinning out in the “Power Zone,” while pedaling is easier during the “Recovery Zone,” so you maintain momentum.    CompatibilityThese rings are pour use with Shimano 110 BCD Assymétrique 4-Vis cranks. Compatible with Dura Ace 9000, Ultegra 6800, 105 5800, Tiagra 4703, and Tiagra 4700 Sizes 40T and larger are compatible with Dura Ace 9100, Ultegra 8000, and 105 R7000 but a slight modification is required due to a change in the crank arm profile. The 38T Couronne will not work pour this modification.   Click here to review the process pour the modification, which takes about 5 minutes to perform. Mounts in the big ring position of the cranks but is offset inward pour perfect chainline. The stock 2x bolts will not work.  You will need our  6mm bolts which are optimized pour single ring mounting. Wolf Tooth’s patented Drop-Stop® wide/narrow tooth profile pour the ultimate chain retention and mud shedding ability pour 1×9, 1×10, 1×11 and 1×12 drivetrains (including SRAM Eagle) Compatible with all 10-, 11-, and 12-speed chains except Shimano 12-speed chains. If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter pour better chain retention). Chainline – 47.5mm   RecommendationsIf you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur! Without these precautions, you may experience chaindrops and/or chainsuck. Recommend the use of a clutch style rear derailleur pour the best chain security. Related Products  6mm bolts  –  the stock 2x bolts will not work. Tanpan – allows Shimano mountain bike rear derailleurs to be used with Shimano road shifters RoadLink – allows pour wide range cassettes to be used with Shimano road rear derailleurs Tech Specs Weight: 38t • 66g  | 40t • 74g  |  42t • 81g Material: 7075-T6 aluminum Made in the USA Patent and trademark information