The invention of the trackday tire is the single greatest thing to happen to trackday riders since, well, trackdays. Being able to leave the tire warmers at home (or not own any at all!) has a trickle-down effect for those lazy riders among us – myself included. No warmers means the stands can stay home, and so can the generator. Better still, leaving all those things behind doesn’t compromise anything out on track; modern trackday tires provide plenty of grip and more longevity than your average race slick. (But let’s make one thing clear: if you’re actually racing, a slick is still the way to go.)
Dunlop Q5/Q5S Tires
Dunlop set out to improve upon the Q4 and the Q3+ for its most capable set of street/trackday tires to date. The results are mostly impressive.
+ HighsFast warm up times w/o tire warmersThe Q5 front is unrealThe Q5S rear keeps its composure better than the Q5 when worn | – SighsRears still tend to wear quickly, at least on big bikesCertain sizes are more prone to shelving (this applies to all tires, I suppose)Still need to try them on the street |
Dunlop was one of the first to introduce a trackday tire with the launch of the Q3 family as far back as 2013. It was soon followed by the Q3+. I was a fan of both tires when I tried them for the first time, impressed by the quick warm-up times and confident handling they provided. Dunlop followed that up with the Q4 – which, on paper, was supposed to be an even better trackday tire. In my opinion, however, it really wasn’t that great. To its credit, the Q4 came to working temperature very quickly, and the revised profile of the tire gave it nice handling characteristics with elbow-dragging lean angles very much within reach. What I wasn’t so impressed with was its outright grip on open-class sportbikes (it worked fine on smaller bikes). Worse yet, those big bikes would wear the Q4 quickly – one day of A-pace track riding was enough to wear the tire down to the wear bars, which was very surprising.
The Q4 was capable of some serious lean angle, but it lacked edge grip.
Anecdotally, it seems as though people I’ve talked to were mixed about big bike grip, but the wear issue was universal. “I got that feedback a lot,” says John Robinson, Dunlop’s Senior Tire Design Engineer (who was a junior engineer back in the Q3 and Q4 days). “At trackdays, I had to explain to the tech inspection folks that, even though a Q4 might be down to the wear bar on one or both sides, there was still at least 4mm of rubber left underneath. New York Safety Track, my local track, knows by now, but it’s something I deal with constantly.” The lesson? Out of the many technical innovations a tire design team constantly think about, they can’t forget the human element. Better placement of wear bars, for example, will more accurately tell an owner when it’s time to start considering new tires. And get tech inspectors off John’s back. Clearly, there was room for improvement with the Q4.
Something More
Obviously, simply moving the position of the wear bars isn’t a reason to develop a new tire. Every tire company is constantly striving to one-up the last thing they made, and Dunlop is no different. The march of time means new technologies emerge, and Dunlop’s involvement as the sole tire supplier to the MotoAmerica series means lessons learned when tires are pushed to the limits are able to trickle down to the tires you and I can buy at the local shop. We witnessed the fruits of that labor with the Q3, the Q4, and we’re about to experience it again.