I am new here and hoping I can find some answers. Both my boyfriend and I are overweight. I have a Raleigh hybrid bike that I have had for years and never had any issues with it. My boyfriend is a big guy....6'3 and 340 lbs. I want him to start riding with me for exercise. I just purchased a cheap bike from Target because I want to make sure he enjoys this before putting any real money into a bike. I ended up getting a Shogun HIgh Roller 29" because I read online that big people should have bigger bikes, with wider tires. The reviews on Target for this bike were few. 2 of 3 reviews claimed there were issues with tires almost immediately and issues and time delays in dealing with the manufacturer (Kent) and getting replacement tires. I want to purchase some back up tires just in case and not sure how to go about it. I searched online and had no troubles finding tubes for 29 x 2.125 but unable to find actual tires that size. I do see tires that are 29 x 2.1...is this the same size?! I have a feeling this is a stupid question!! LOL! Also, any tips on particular bikes or bike parts for big people would be much appreciated! Thanks in advanced.