Saddle fitting - Adapter ? Bolt & Rail ?

[HumpTdumpty]

Hi my 1996 purchased old bike has a single bolt attachment re saddle fitting - if I purchase a new Rail based saddle - any suggestions how I attach it ? Is there an adapter available or something? Pictures attached of existing saddle and just a basic box standard rail type I’d like to fit ?
Any suggestions most welcome thanks in advance regards Humpty

 

[fossyant]

You need a new seatpost.

You also need to check the post's diameter before ordering. Now it looks like the top clamp is a separate part, many cheap seatposts are like this and you may be able to get a replacement clamp, but I recon a new seatpost will be about the same price.

 

[Cycleops]

Seatpost diameter may be stamped on your existing one.

 

[HumpTdumpty]

Thanks everyone sorry for being thick here - why do I need a new seat post as opposed to just a different clamp ?

 

[T4tomo]

Its unlikely that the rail clamp, if you can get it separate to a seat post for much less than a seat post and clamp costs, will fit the diameter of post at the top of your old seat post.

 

[HumpTdumpty]

Ok understand thanks for that 👍

 

[fossyant]

It will most likely cost you as much anyway. £10 should be enough. Lots of different diameters though. 27.2 is the 'norm' but plenty of other odd sizes are out there, 27.0, 26.8 etc. as well as larger on more modern bikes.

You definitely need to check.

 

[HumpTdumpty]

Thanks appreciate the heads up ! What a mine field for such (what I thought) was going to be a simple job 👍

 

[I like Skol]

If you have access to any bikes at a tip or scrapyard you might drop lucky and find a bracket that fits your existing post and new saddle. That kind of clamp is only found on cheaper bikes nowadays, the kind that often get thrown away after just a year or two.
Otherwise, as has been said already, get a new seat post/clamp combo. Just make sure you get exactly the right size/diameter post. 0.2mm might not sound much but it can make the difference between a nice fit or having to hammer it in (it's been done!) Or a post that slips down or damages the frame trying to clamp it enough.....