Saddle posts

次回この記事の日本語版を投稿します。

In the 12 part series on vintage sprung leather saddles, we looked at various saddle styles, their different suspensions, some of the tools used to maintain them, and trademarks.  It is only befitting that the series be followed up with a bicycle part that directly related to the saddle but often overlooked, the saddle post.

Shown below is a typical utility cycle saddle post from the 1950s.
Basically, 2 pipes welded together which enables the saddle to be adjusted vertically and horizontally.
Although this is the predominant profile, a closer look shows minor differences.

The left one has a hollow back.  The middle one has a closed back.  The right one has a closed back and the bicycle manufacturer's trademark.
 

A closer look.

The trademark is Mizutani.

Compare the above simple construction with a rare style saddle post from an early 1950s Bridgestone bicycle. 
This design has more than twice the number of parts than the above saddle posts.

Note the bolt that runs through the post.

The bottom is split and the construction is similar to a handlebar expansion bolt.

Tightening the bolt slides the two pieces in opposing directions against the inside of the seat tube thereby securing it in place.

Finally, here is a utility cycle saddle post from the early 1970s.
Basically, one pipe bent and strengthened with a weld on the inside of the bend.

Often overlooked, the saddle post can serve as a clue in helping to date a bicycle.  As we can see from the above, older ones are constructed from more parts and more solidly constructed.