[IndyIan]

Drafting on bikes is huge! My buddy and I in highschool used to draft cubevans or other big vehicles on a windy road near our place on our mountain bikes. We'd "ambush" them at a slow corner and then sprint to get in the wake... We could hold it to about 55km/h if they didn't accelerate too fast. Higher speeds than that, we would tire and get dropped on any slight uphill. Good fun when you are young and invincible!
We would also be dumbasses to lone roadies on the bikepath, drafting together we would pass them and then could beat most of them over a mile or 2... Not many reacted to really race but some would. Usually together we could stay ahead but I don't think we ran into any real serious riders, a sustained 30 mph sprint would've left us way back... No one got mad, it was just some impropto street racing!