1. Prepare grill.
2. Lightly coat corn with cooking spray. Place corn on grill rack; grill 20 minutes, turning occasionally. Cool completely. Cut kernels from ears of corn; place in a medium bowl. Discard cobs.
3. Add bell pepper, tomatoes, onions, and chipotle chile to bowl; toss well. Combine juice and remaining ingredients in a small bowl, stirring with a whisk. Drizzle juice mixture over corn mixture; toss well. Cover and chill at least 30 minutes.