Going this weekend to look at a Schwinn Twinn. All I have seen is a not too clear picture. It is green. The seller says it is a 1977 model.The tires look like knobby Mtn bike tires. I hope the wheels have not been changed.The fenders are included , but not installed. Probably because they won't fit over the knobby tires. The seller says it needs only a chain to be rideable. Photos will be coming if I buy it. Thanks.