During a bike fit it might be necessary to change a stem or handle bar so we can find the correct size that provides optimal comfort and positioning on your bike. Having these product on hand allows me to provide greater customer service and convenience. BC Bike Fit carries reputable brands such as Ritchey, FSA, Selle Italia and Chromag. If these are not what you were looking for based on your brand of bike and model, I might be able to order in what you may need. If not, local bike shop will be able to source your components.