Seat bolt question

[argonsixar]

Just out of curiosity what frame is it

its a Vic Edwards, apparently built for Buck Cycles as a TT frame for a customer

 

[argonsixar]

Could be of the BSF variety as my Dave Russell has BSF threads…

You were bang on! Just fitted a 5/16th BSF straight in.
Many thanks for your kindly suggestion !

Terry

 

[argonsixar]

I had a similar issue with a 1961 Holdsworth.

From Doug Fattic https://www.bikeforums.net/21585236-post12.html


Advice was 5/16" BSF 22 tpi.
But it turned out I needed 5/16" BSCy 26tpi, which is an older standard.
Late 70s is probably metric, or possibly BSF, just thought I'd mention there is another 'standard'.

Maybe try a bolt with a torque wrench and stop turning if the torque gets too high.

deffo BSF. Just fitted a 5/16th no problem.

 

[Nob]

You were bang on! Just fitted a 5/16th BSF straight in.
Many thanks for your kindly suggestion !

Terry

Glad you got in sorted