The northwest section of Miami-Dade County, bounded by the Palmetto Expressway, Florida's Turnpike, and Interstate 75, is an urban cyclist's paradise. From Palm Springs North to Doral, you can cover 20-plus miles of rugged terrain that takes you through a suburban utopia, a concrete jungle of industrial warehouses, and patches of sensitive wetlands overflowing with melaleuca and palm trees. The die-hard riders who tackle these roads rely on the services of GM Bikes to keep their spokes well lubed and in tip-top condition. You can trust head bike mechanic Yulien Rodriguez and his crew to provide topnotch service, whether it's fixing a simple flat tire or a complete overhaul of your two-wheeler. The prices are reasonable. A new tire runs less than $30, and a tune-up is $45. Shop owner Isabel Rodriguez makes sure GM is always stocked with top-of-the line cruisers and road and mountain bikes from Giant, Fuji, Jamis, Intense MTB, and Felt, to name a few. Prices for a new cycle range from $200 to $5,000. The staff takes the time to make sure customers find a bicycle that fits their needs. And once you've purchased a new bike or fixed up your old one, join the GM folks for their weekly Saturday-morning runs to Dolphin Mall, one of the more adventurous tours in Miami-Dade.