If you"re rolling with a Mavic Yksion Pro Griplink on your front wheel, you"re going to need the Yksion Pro Powerlink Clincher Tire for your rear. Though you may wonder why you would need a rear specific tire, Mavic has engineered the Pro Powerlink to speed up your bike through smooth rollers, hard corners, and inclement weather. You probably already knew this, but your rear wheel serves a different role on your bike than your front wheel. With the majority of your weight over the rear wheel, you need less rolling resistance. So, with this in mind Mavic engineers designed the tire to be highly responsive by using the harder 70a rubber compound down the middle. And since you still need grip on your rear tire while cornering, the soft and grippy 60a durometer rubber cases the side walls. The rubber isn"t the only piece of technology that makes the Pro Powerlink Clincher a great rear tire. A high density casing lines the tire, improving its flex to prevent rolling it at a lower PSI. Flat protection is also important while you"re training and racing. Mavic uses a 127 TPI casing throughout the tire -- tough enough to stave off flats on the worst roads and cobbled streets. An additional Kevlar breaker is used under the tread for extra protection. Surprisingly, this addition only adds a superficial amount of weight to the construction. The Mavic Yksion Pro Powerlink Clincher Tire weighs around 190 grams. It is available in the color Black/white and in 23 and 25mm sizes.