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2001FZ1 02-19-2011, 06:30 PM I'm looking at putting a set of Continental Extreme Contact DWS tires on my stock wheels mainly because they rate so well at Tire Rack and my brother has a set on his Cobalt and really likes them. The OEM tire size is 215/60 R16. Continental does not make them in that exact size. They do make 225/55 and 215/55. Will I notice much of a difference with either size vs. the OEM tire? Thanks! Starship 02-19-2011, 06:45 PM The OEM tire has a 215mm tread and 215 * .6 or 129mm (5.08") sidewall. So, the total diameter for speedometer purposes is (215 * .6) / 25.4 * 2 + 16 = 26.2" or so. By the same token, 225/55 is (225 * .55) / 25.4 * 2 + 16 = 25.7" (~2% of OEM). The 215/55 is pretty far off as (215 * .55) / 25.4 * 2 + 16 = 25.3" (~4% of EOM). Go any thinner and the width of the rim may be too wide. Malo83 02-19-2011, 08:47 PM Try here ;) http://www.miata.net/garage/tirecalc.html baggedmaro 02-20-2011, 06:44 AM go with the 225/55 the overall diameter is really close to your factory size. those dws tires are great tires but do have weak sidewalls and are prone to impact breaks ( bubbles in side walls) Discount Tire 02-24-2011, 01:02 PM I'm looking at putting a set of Continental Extreme Contact DWS tires on my stock wheels mainly because they rate so well at Tire Rack and my brother has a set on his Cobalt and really likes them. The OEM tire size is 215/60 R16. Continental does not make them in that exact size. They do make 225/55 and 215/55. Will I notice much of a difference with either size vs. the OEM tire? Thanks! There are a lot of really great tires in the OE size if you want to stick with it. What are you looking for in a tire; life, comfort, quietness? Are you planning to use the tire year round? 2001FZ1 03-03-2011, 10:59 AM There are a lot of really great tires in the OE size if you want to stick with it. What are you looking for in a tire; life, comfort, quietness? Are you planning to use the tire year round? They need to have long life, quiet and be an all season tire. Grand Touring Tires are what I have been mainly looking at. Discount Tire 03-03-2011, 03:30 PM ^ I would take a close look at the Hankook H727. Here's the link with more details... http://www.discounttiredirect.com/direct/findTireDetail.do?pc=11318&counter=2&ar=60&rd=16&sw=false&cs=215 | ||