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new size 140/75 R17 and 200/55 R17 can be used now  from the  Harley-Davidson Fat Boy
Especial for the new Modells Fat Boy Special and Screaming Eagle Fat Boy.

Metzeler ME 880 Marathon is a reliable tyre designed for cruiser and heavy touring bikes. The customised carcass construction ensures excellent riding comfort and high speed stability even under heavy loads. The soft rubber compound assures high grip and total control. Technically designed tread pattern with unique groove arrangement ensures high mileage, low noise and uniform tread wear. With excellent water displacement ability, the tread pattern of this tyre gives enhanced performance. Smooth riding, neutral steering and high stability under hard braking are the highlights of this tyre. Metzeler ME 880 Marathon maintains larger contact patch with the surface for additional stability and traction.

Metzeler add to their innovative range of tyres using the latest Interact™ technology with the introduction of the ultimate Sports Touring tyre, the Roadtec Z8 Interact.

Developed with Sports Touring and Naked bikes in mind, the new Roadtec Z8 gives unmatched feedback, consistent performance and great stability at high and low speeds. The new tyre retains good comfort even over long distances and when loaded with a passenger and luggage. The Roadtec Z8 Interact utilizes the most advanced technological solutions developed by Metzeler, such as its variable tension Interact™ multi zone structure, new composite compounds,  new profiles with larger contact areas and an exclusive tread design inspired by Greek Pi (p).

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Get a free fitment or a jacket from Dunlop Motorcycle if you by a set of Dunlop Roadsmart !!
more information >> http://www.dunlopmotorcycle.eu/

New Metzeler Racetec - With InteractTM Technology

Advances in evolution are something you can’t stop, above all in the motorcycle racing world. Tyres must lead the process of evolution in order to match the increasingly sharp precision and demanding behaviour of the latest racing bikes. Metzeler’s answer is based on technology: the new Racetec adopts INTERACT TM technology, the latest evolution of the patented 0° steel belt. The main target of this new development was the desire to make one step forward in the PURE LAPTIME project, designing what we call the new PURE RACETIME project: regardless the skill of the rider, the aim is to shave seconds not only off his best lap times but also the overall race times, thanks to a very constant performance all the way to the end. The New Racetec design is tremendously effective, and it’s cool to look at. It is characterized by the concept of controlling the distribution of land/sea ratio from the crown to the shoulder, following an optimized tread distribution (patent pending). It makes the ride more linear at every lean angle, reducing the tread’s influence on the tyre’s behaviour on track and reducing any overheating effects, to ensure maximum duration of full-on performance.

PRODUCT CHARACTERISTICS

ROADTEC Z6 INTERACT represents Metzeler way of innovation. Instead of pushing on a single element of the tyre like the compound which is then subjected to wear, Metzeler established that is more effective to improve the whole tyre system. Making the tyre elements interact to the maximum level means improving the interaction between the tyre and the ground, the tyre and the bike, the tyre and the external environment. This is the key of the new INTERACT technology. ROADTEC Z6 was perfection, ROADTEC Z6 INTERACT is the evolution, the fine tuning which guarantees it to be the perfect tyre for the new generation of bikes and riders.

For every motorcyclist who loves enduro, Metzeler is a brand which represents a particular value, an image of excellence and a tradition of success. Street enduro riders view the Metzeler TOURANCE as the product which sets the standard. Metzeler technicians have pressed on with their development work and have come up with a new product in response to the increasing specialisation of bikes in this class.

This was the origin of the TOURANCE EXP, which stands out for its delivery of maximum performance in the sports touring which modern maxi-enduros allow, without sacrificing the possibility of taking light off-road detours in its stride. To ensure the level of excellence which Metzeler has always offered its enthusiasts, and to put Metzeler once again in lead position with this innovative product, the new TOURANCE EXP is the first tyre to equip not just the rear but the front as well with Metzeler’s patented solution of the zero degree spiral wound steel belt. With an aggressive design and world-class performance, the TOURANCE EXP is being launched to meet the characteristic requirements for this kind of riding – stability, long tyre life and grip in the wet – thanks to the advanced Metzeler technology applied to the various components of this product. Compound, structure, tread design: all the elements have been designed to offer the maximum performance.
 

Metzeler Racetec will continue as the official tyre supplier and presenting sponsor of both the National Superstock and National Superstock Cup championships in a two year contract announced today by Dorna UK, the commercial rights holder of the Bennetts British Superbike Championship.

Metzeler Racetec has been the official control tyre of these two heavily subscribed production racing championships since 2005 and the partnership will continue through both the 2007 and 2008 seasons.

The Metzeler Racetec National Superstock Championship and Metzeler Racetec National Superstock Cup will each be decided over 13 rounds held alongside the country’s premier motorcycle racing series, the British Superbike Championship.
The agreement with Metzeler Racetec confirms that they continue as the Official Tyre Supplier to the championships, providing all competitors with a tyre package throughout, and at a significantly subsidised rate. Additionally Metzeler Racetec will also reward performance on track with the provision of free of charge tyres for podium-placed riders against their season package.

Tony Partis, managing director of Dorna UK, commented: “We are very pleased that the competitive nature of the Superstock series has attracted so much support from Metzeler Racetec. With the packages that they have put in place we are maintaining the key values of the Superstock series, of terrifically close racing at a very affordable price.”

Managing Director Business Unit Moto Pirelli Ltd, Gianmarco Spigolon, added: “We have watched as the British Superbike Championship has gone from strength to strength and wanted not just to be part of it, but to add to the spectacle. The Superstock series always sees full grids and full-on racing so Metzeler Racetec are very exited about our association and look forward to seeing it develop even more throughout the next two seasons.”
(Nick Harris Media Communications)  

Motorcycle Tires Under Extreme Load: A Look at the Physics of Grip

This text dives into the extreme stresses placed on motorcycle tires at high speeds, highlighting the impressive performance of these seemingly simple components.

Forces at Play:

  • < 200 HP: The engine's immense power needs to be transferred to the road through the tire, posing a huge challenge for grip.
  • < 270 km/h (168 mph): At this speed, the tire rotates 1.5 times per second and travels 4.5 km (2.8 miles) further than the front tire due to "spin" caused by slippage.
  • Torque: The engine's gearing amplifies torque at the rear wheel, resulting in strong pulling force.
  • 1450 Newtons: This immense force pushes the motorcycle and rider through the wind, with the tire providing the frictional force necessary for forward movement.
  • 150 kg (330 lbs) Wheel Load: The motorcycle's weight rests on the tire, further increasing friction and wear.
  • 4.5% Slip: At high speeds, some slippage is unavoidable, leading to heat generation and wear.
  • 100 Degrees Celsius Rubber Temperature: Frictional heat can significantly raise the rubber temperature, affecting its properties and grip.
  • 270 Newtons Centrifugal Force: The centrifugal force on each individual belt thread within the tire is enormous and can lead to structural damage.

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