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I run with both 17" and 15" on my Cobra. Was also concerned which pressures to run as well. Figured would check with the expert, HRE Motors. Billy advised me if running my 17" tires (335 Rear and 255 Front) to go with 32in the Front and 34 in the rear Rear (in warmer weather) or 30 in the Front and 32 in the Rear (in colder weather). As to my 15" (295 Rear and 235 Front), I run 26 Front and 28 Rear.
Based upon the larger 17" tires was told you must run a little more pressure. Good luck.
Jim
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