D211 GP-A N-Tec USA Made:
AMA Spec Tire for 2010 – 2014


• Developed from N-Tec D211GP series
• Multi tread; super grip on the sides, cool running center
• Zero growth; no need for major ride height changes
• Low pressure; for maximum contact patch
n-tec

D211

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120/70×17 D211GP-A

Fitment specs Front: 120/70×17 D211GP-A
Recommended Rim range
(3.50-3.75), Best Rim (3.50)
Width
(123mm/4.83″), Diameter (604mm/23.79″)

Available Compounds:  7455 Med, 8477 Med+
Suggested Pressures:
Hot on the warmers 33psi, or cold 31psi

Note: For street riding, follow the motorcycle owner’s manual for air pressure recommendations. For track or race use, optimal air pressures vary with track conditions but general suggested air pressures are above.

D211

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190/55×17 D211GP-A

Fitment specs Rear: 190/55×17 D211GP-A
Recommended Rim range
(5.50-6.00), Best Rim (5.50)
Width
(188.5mm/7.42″), Diameter (647.3mm/25.48″)

Available Compounds:
  7455 Med & 8477 Med+ 
Suggested Pressures:
Hot on the warmers 23psi, or cold 21psi

Note: For street riding, follow the motorcycle owner’s manual for air pressure recommendations. For track or race use, optimal air pressures vary with track conditions but general suggested air pressures are above.

D211

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190/60×17 D211GP-A

Fitment specs Rear: 190/60×17 D211GP-A
Recommended Rim range
(5.50-6.00), Best Rim (5.50)
Width
(191.3mm/7.54″), Diameter (657.4mm/25.92″)

Available Compounds:
2662 Soft, 7455 Med, 8477 Med+
Suggested Pressures:
Hot on the warmers 23psi, or cold 21psi

Note: For street riding, follow the motorcycle owner’s manual for air pressure recommendations. For track or race use, optimal air pressures vary with track conditions but general suggested air pressures are above.

Tec Info:The next-generation Supersport race tire developed and manufactured in the USA to specifically meet the needs of American racers and sportbike riders.MT Multi-Tread compound gives the D211 GP-A rear tire unparalleled grip, excellent drive out of corners and superior on-track handling.Jointless Band (JLB) rear-tire construction reduces tire growth for cooler running and enhanced grip.AMA Spec Tire chosen for the 2010 – 2014 racing season. Excellent Track Day tire.
Construction: Dunlop’s N-TEC construction first appeared on early rear-tire prototypes late in the 2003 AMA pro season. Improvements continued throughout 2005 and 2006, and by the beginning of 2007 Dunlop was providing N-TEC tires to all of its supported factory and satellite teams, as well as privateer riders. Success was pervasive and Dunlop dominated the podiums and collected all four titles that year. 2008 was another stellar season, and the company’s record of achievement played a significant role in the selection of Dunlop as the sole tire supplier for AMA Pro Racing in 2009 and beyond. The development of the first N-TEC—a rear design—was one of the most complex motorcycle projects ever undertaken by Dunlop. Producing a continuously wound, multi-compound tire that delivered consistently fast laps was a major undertaking. Radial construction provided excellent straight-line stability and eliminated circumferential tire growth, which allowed the tire to run cooler. The challenge was to engineer sidewall stiffness to produce consistent feedback or “feeling” for the rider as the bike transitioned from upright to full lean and back again. Numerous carcass materials were evaluated both for riding feel and for their resistance to heat and stress. The engineers settled on a nylon carcass overlaid with two nylon breaker belts and a continuously wound JLB, aramid-fiber tread belt.

The N-TEC front also utilized radial construction with two nylon carcass plies and two aramid cut-breaker carcass belts.

For 2010, the Sportmax D211 GP-A employs a new stiffer nylon ply material. This stiffer material allows for steeper sidewalls and an entirely different tire profile. Dunlop’s Intuitive Response Profile (IRP)—first introduced in the Sportmax Q2 in 2009—is applied to both the front and rear D211 GP-A tires. These steeper angles improve steering and linearity response in transitions, rider feedback, and overall stability. Another benefit of the steeper sidewalls is increased cornering performance. Cross-sectional analysis reveals the intent of this design: creation of a larger contact patch when cornering. To achieve this larger contact patch, Dunlop engineers utilized three-dimensional computer modeling and FEA (finite element analysis) to scrutinize the many forces exerted on the Sportmax D211 GP-A at varying lean angles. Engineers used FEA to closely evaluate contact patch pressure distribution and the effect that different construction materials had on tire stiffness, especially at full lean angles. The D211 GP-A footprint peaks at around 50 degrees of lean and remains substantial up to 60 degrees, whereas the previous Sportmax GP-A footprint peaked at 40 degrees. The rear profile is visibly narrower and taller, while the front is slightly wider with a steeper tread edge drop. In keeping with N-TEC design, the rear tire features Dunlop’s Multi-Tread (MT) technology—multiple tread zones that are extruded simultaneously. Introduced in the Sportmax Q2 in 2009 and also incorporated into the Sportmax Roadsmart, MT technology combines a tough, cool-running compound placed in the center of the tread to provide enhanced straight-line stability and excellent traction under acceleration. On the left and right sides of the tire face, lateral-grip compounds developed specifically to enhance traction at moderate-to maximum lean angles flank the longer-wearing center section.

For the D211 GP-A rear tire, all-new, proprietary compounds are formulated from polymers and resins for the high-stiffness and high grip treads to significantly improve grip, stability and durability, with better resistance to repeated heat cycles. For AMA Pro Racing competition, racers can select from a “soft” front or a “medium” front, and a soft or medium rear (both rear choices are Multi-Tread).

Quality: No Dunlop tire enters the paddock or the marketplace without substantial testing, and the GP-A is no exception. Developed primarily by racers, including Danny Eslick, Martin Cardenas, Steve Rapp, Josh Herrin, Tommy Aquino, Shawn Higbee, Jamie Hacking, the Wood brothers, and former national road racers and current Dunlop test riders Rich Conicelli and Danny Roberts, the D211 GP-A began life at the 2009 AMA Pro Racing test at Auto Club Speedway, CA, and subsequently at top racing circuits across America. It entered competition in prototype form at CCS (Championship Cup Series)-sanctioned races at Homestead, FL, and WERA (Western Eastern Roadracing Association)-sanctioned events at Roebling Road, GA, and Las Vegas International Motor Speedway. Additional testing and development took place at the Dunlop Proving Grounds in Huntsville, Alabama.