I think that my old Ladies’ Speedwell Popular is the perfect shape of bike for this new saddle, as the bars are quite high relative to the seat and all of the rider’s weight is on the sit bones. As an upright single speed with coaster brake only, the Speedwell is most suited to comfortable shorter distance rides on flattish terrain.
The broader saddles from Brooks have been designed for this upright seating position. The lower the bars relative to the seat and the more the rider’s weight is on hands and feet the narrower the saddle that is required, at least in my experience, because broad saddles may interfere with the free movement of the legs on longer, faster, “leaning forward” rides – so it’s worth thinking about what your bike will be used for when buying a Brooks (or any saddle), as well as considering your riding position. Narrow saddles are generally less comfortable on upright bikes, as I noticed after converting my Road King bars to “North Road” style.
In the true spirit of the Speedwell Popular, the B18 “Lady” saddle or the unsprung B68 would perhaps have been the right aesthetic choice for “Her Ladyship” as I think the Popular models may have originally been fitted with an embossed unsprung or semi-sprung broad leather saddle. Never mind, I have been anxious to replace the old white “Royal” Italian white vinyl saddle, as it was out of character with the rest of the bike, and much too softly sprung (worn?).
Incidentally, the “S” on a Brooks saddle number like B66S refers to a shorter version of the (e.g.) B66 that is said to be more suited to the female build. This “S” is only around 20mm shorter than the standard B66 on the road king.
I did also want a black saddle for this bike so as not to clash with the bright colours and black grips, and as far as I know the B18 only comes in brown.
On a recent ride I became aware that the gearing is too high for grades at 48x18T, and have ordered a larger rear track cog for it to improve low speed flexibility. A 2-speed hub would have been perfect with this current gearing as the second one – ah, well.
Problems with the substitute used left hand pedal have also led me to order some new MKS3000R rubber platform pedals – although larger than the original pedals and not-quite-right aesthetically for this bike, they are at least very well made replacements for classic bikes, the best I’ve seen recently of this “hard to find” pedal style.
Here is a close up detail on this bike – and can you see why I would not re-paint this frame ?