I've been riding for about 10 months, this is my first bike, and of course I feel comfortable just riding with me on the bike, but I've never had a passenger. The dilema is....my girlfriend :boob . She would love to go for a ride, but my contention is she's too tall, I'm 5'10" and so is she! I don't really want to learn how to ride with a passenger that 5'10", maybe 5', but not 5'10". What do I do and what's the best ideas?