Join Date: Aug 2010
Motorcycle: 2009 GSXR750, 2012 Yamaha R6, 2011 Ninja 250
The 190/55 was made for the 5.5 inch wheel or 6 inch wheel. The Tire spec books list it as a recommended size for those wheels. A mechanic who says anything different is an idiot and shouldnt be touching bikes. He obviously isnt keeping up with current product applications. The 190/50 is not specified for the 5.5 inch wheel and shouldnt be mounted on a 600/750. Not to mention that the 190/50 is the most worthless tire profile ever invented unless you ride slab 24/7.
It will change the geometry of the bike. The brand of tire will also change the actual size of the tire. The Bridgestone S20 in a 190/55 is taller than a Dunlop or Michelin. The change in geometry will make the bike steer faster.
We went to the 190/55 in 2006 or so and havent looked back. Much better profile and the bikes handle much better. I dont like to put them on R6's because they eat power and the R6 steers quickly enough but on anything else it's a huge improvement.
Having chicken strips after a trackday with a 190/55 is really nice. Knowing that there was a little tire to spare is really good for confidence.
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