I'm thinking of using an extra wheel trailer but it says you need different nuts from them but can't find what size and tpi they are. Any guidance much appreciated.

Found it, 3/8.

but are they 24 or 26 tpi?

the nuts i got from edinburgh bikes to fit my ebc trailer thread on fine if its those you're getting? maybe different if they're bob ones tho. dont know any more details mind they dont come with any info

edit: just realised extra wheel are a brand, maybe ebc can help if they know the thread detail for their nuts?

Thanks for that. I'll have a go!

26 tpi

Thanks!