Weight

[williaa68]

Please help me understand something. I was having dinner with a friend last night who is about to spend a lot of money on a new bike. One of the reasons was that it is about 2kg lighter than the old one. My friend is a big guy - I would estimate about 95-100kg. In good shape but he certainly could lose weight if he wanted to. I suggested dieting would be cheaper than a new bike but he seems convinced it isn't linear - is it isn't about (weight of bike + rider) but there is a multiplier on the weight of the bike - a bit like unsprung mass on a car used to sell carbon ceramics. Can someone please clarify / explain (or tell me this is BS, which is what it sounds like!). Thanks in advance,

[williaa68]

Thanks everyone. I've told him to lose 10kg and buy the bike as a reward! And yes, there was the odd glass or two involved in the dinner!