Tires are one of the most important factors when it comes to the handling of your motorcycle. It’s what separates a great ride from just a good ride. So as a follow up to our last tire comparison, we’re putting 11 sets of the latest and greatest road rubber to the test by lapping them at The Fastest Road in the West, Willow Springs Raceway, during a two-day evaluation to find out which hoops are the best.
EIGHT BRANDS, 11 MODELS, TWO CATEGORIES
(Top) The 11 sets of test tires were split into A/B groups based on price and performance. (Bottom) Each set of tires were subjected to six laps around the big track and another seven around the Streets course the following day.
This time eight tire manufactures stepped up to the plate, including Avon, Bridgestone, Continental, Dunlop, Michelin, Metzeler, Pirelli and Shinko. We asked each to submit one or more samples of its current sport rubber designed for highperformance street riding (not racing) in 120/70-17 front and 190/55-17 rear fitment for a 2014 Suzuki GSX-R1000. We then divided the models into two categories: ‘A’ and ‘B’. The A group are the premium, top-of-the-line tires in each manufacturer’s respective line-up, while the B group represent a more affordable, but still capable sport tire solution.
English tire brand Avon supplied its 3D Ultra Xtreme 3 for the A group and the 3D Ultra Supersport for the B segment. Bridgestone followed suit, offering its Battlax S20 for the premium segment and an updated ‘Pro’ version of the successful and previous B-group leading Battlax BT-016s.
Continental is a new entry for our shootout, and as such, the German brand shipped its top-of-the-range Sport Attack 2 (A group), a tire that comes as OE fitment on some new BMW S1000RRs.
Reigning shootout champ, Dunlop, enters the competition with its new and improved Q3 shoes while French rubber powerhouse, Michelin, wished us to test the equally fresh Pilot Power 3s. Both were slotted into the A segment. Metzeler also joins the fray with its Sportech M5 Interact that features a new special ‘D’ compound rear for the B class. Its Italian sister company, Pirelli, submits a re-tooled Diablo Supercorsa SP V2 that come as standard equipment on both Aprilia’s RSV4 Factory APRC and Ducati’s 1199 Panigale superbikes.
Last but not least are highly-affordable options from Shinko, a Japanese brand with production based in Korea. The A group gets its more expensive Apex tire while it enters its Verge 2X donuts in the B group.
(Top) Chicken Hawk Racing tire warmers were fitted around the tires to conceal their identity to our Road Test Editor, however they weren’t powered ‘on’ to better gauge warm-up performance (Center) Temperature probes were drilled into the front and rear fender to measure the surface of the tire’s temperature which we used to calculate their warm-up time. (Bottom) Once again we recruited Kinelogix to help us record and analyze data from the motorcycle/tires and complement our subjective rider feedback.
Because it would take months of riding to put enough miles on each set on the street, we quite literally sped things up by conducting this exercise strictly at the racetrack. The first day was spent at California’s Willow Springs Raceway on the fast and flowing 2.5-mile main course. The big track is especially tough on tires because of 100-plus-degree summer pavement temperatures, highly abrasive asphalt and ultra-high-speed Turns 8 and 9. The following day we moved to the shorter 1.3-mile Streets course which emphasizes a different set of parameters, including heavy braking and acceleration, as well as quick transitions from left-to-right and vice versa, often over pavement irregularities and large bumps.
Beforehand, each tire was weighed and measured. Once mounted to the motorcycle, tire pressures were set according to each manufacturer’s recommendations. Continental, Dunlop, and Shinko didn’t submit a recommended pressure so those were set to our internal suggested baseline of 32 psi front, and 30 psi rear. Each tire was then wrapped with Chicken Hawk Racing tire warmers to conceal their identity to the rider (the warmers weren’t powered so we could gauge each tire’s warm-up performance). At the end of each day we used a durometer to measure the tire’s hardness, comparing it to when it was new.
After a quick warm-up on the GSX-R’s OE-fitted Bridgestones we employed our proven blindfold test methodology. Here’s how it worked:
The rider spun six laps on each set at random on the big track, and another seven (again in random order) on Day 2 at the Streets. Temperature and pressure sensors monitored the tires and were augmented by our trusty data acquisition partner, Kinelogix. The data helped us evaluate the Warm-Up Time scoring category. Other criteria including MSRP, Weight, and Lap Times made up the remaining objective components of the scorecard.
Each model was further rated on an equal number of subjective measures including Steering, Stability, Grip, and Overall Preference. Points were then assigned based on our long-time scoring system with 10 points for first, eight for second, seven for third, six for fourth, etc. We then tallied the points to arrive at a winner. Now it’s time to find out what’s the best motorcycle tire.
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