With my PR4s, (150/70X17), my GPS and speedometer are within 1mph of each other. Over 1,000 miles the odometer varies from the GPS by slightly over 1 mile.
Are you sure you are talking about Dunlops? The Roadsmart 4 is their newest tire. There is no 6 yet unless I've missed something. I think you may be referring to Michelins.Just installed Roadsmart 6 Tyres. They really handle well. In fact they are almost as sticky as the Pirrellis I used on my Ninja. They are quite different from the 4s they replaced.
We do that to justify in our minds the significant expense of new tires. Anyone who has been married for a while learns to justify toy expenses..... "but Hon, I will be safer....."Russ - That was the point I was trying to make earlier today. When you fit a new tire and it feels great, your condemnation of the old tire is of a worn unit with 8-10k miles! It's not exactly an apples-to-apples comparison.
Were your Shinkos 705?. The front is a bit funny at first but after a couple of hundred miles it feels better. It wants to fall into the turns at first. Ran them for years on my V-Stroms. I have just switched to Michelin Anakie threes for my V-Strom as I don't do as much off the pavement with it anymore and they are a bit smoother than the Shinkio 705s.When I first bought my NC700XD, it came fitted with either Metzelers. After they were in need of replacement, I bought a set of Shinko tires designed for 80% street/20% dirt. Iron Pony had them on sale and the package price for F & R was around $160 so I thought what the heck, I don't plan on riding distances so why not.
About 30-min into my first ride on these Shinkos, I knew they were terrible tires and ditched them after a few thousand miles. There are Shinkos that are OK but these weren't in that category!