Some of our wider saddles with springs come with an additional clamp and are not compatible with the modern, micro adjust seat post, but instead with an old-style seat pillar. These saddles have a double or triple rail system. For saddles such as these, the clamp is first affixed to the saddle rails and then attached to seat-post. These are more common on older classic bikes.
Most modern bikes however, will have a seat-post with a micro adjustable clamp. For this type of seat post there are many single-railed Brooks options. Brooks saddles with this type of undercarriage are the B17, B67, and Flyer as well as all of the sportier, racing models like the Swift and Swallow. In addition, all Cambium models and single rail and therefore should only be used with a micro adjust seat post.
If you have a double- or triple-rail saddle, but no clamp, the appropriate clamps can be purchased from our website.
Special note: the B67 and the B66 models are the same, but the B67 is has a single rail for a micro adjust seat post and the B66 a double for use with the clamp. Depending on what seat-post you have on your bike, you would choose accordingly.