Continental ContiProContact 235/55R17 99H vs Continental ProContact GX

Both are Continental all-season touring tires with silica compounds and interlocking sipes, so the real split is size and fit, not brand. The ContiProContact is a 235/55R17 with a 60,000-mile warranty and a 400 treadwear grade; the ProContact GX is a wider, taller 225/55R18 XL with a 500 treadwear grade, a 102 load index and a rim protection ring on some sizes. Buy the one that matches your wheel and load needs; neither is a step up in grip over the other. Owners rate the ContiProContact well for quiet ride and wet manners, and the GX carries the same reputation as an original-equipment tire.

• Choose the ContiProContact if your car runs 17-inch wheels on 235/55R17 and you want the longer 60,000-mile treadwear warranty.
• Choose the ProContact GX if you need 18-inch fitment, the higher 1,874 lb load capacity of an XL tire, or rim protection on your wheels.