What bikes do you use? I just made my first with a very cheap bike that I got with the kit free and have had problems with bad quality wheels and rear derailleur cogs. I guess I would go to Walmart and get a bike that I premeasured to fit the kit on it if I were to buy a bike for my next build. I can get a bike with disk brakes, shocks and many speeds there for about $100. Then I might change the rear derailleur cogs or the whole thing and possibly change out the rear wheel to something more heavy duty.