With the current clamp,
It's possible to increase the inner diameter on the lower half, to enable it to fit over the seat tube.
Problem arises with trying to secure the seat post by clamping from the front. Slot/cutout is at the rear.
From just looking at, yes. However you're then clamping the seat tube from the front.You think we could make the clamp wide enough to fit over the seat tube?
Have a chat either to JD Tandems in Yorkshire or to SJS in Somerset.
Hi CathrynSuperb advice - I chatted to the Yorkshire guys last week and have contacted SJS today. We're much closer to SJS so that's more feasible.
Hi Cathryn
On our Thorn tandem the clamp on the seat post is 30 mm deep, much smaller than your 2 and 1/2 inches or about 62mm so half the size of yours.
So I suggest that you remove the seat post with the clamp and the stokers bars and take the whole assembly with you on your visit to SJS Cycles.
Make sure that you have plenty of money on your credit card as the Thorn kit is not cheap!
Before starting to ride explain to your son that the handlebars are only there to rest his hands, you do all the steering and he just sits and pedals.
Mike
Hi CathrynHi Mike. Thank you for the info - that clamp sounds really useful and gives me hope. We're actually in email contact with SJS, they've been really helpful and sent me a link to a clamp, it might be that one! I would LOVE to go and visit but I'm not sure they're welcoming customers at the moment, which is sad but useful for my bank balance.
Hi Cathryn
I read somewhere that even before Choina Virus SJS preferred you to make an appointment rather than just walking in.
How far are you allowed to travel atm and how far are you in Wiltshire from SJS?
Anyway I am sure that SJS will have a solution for you.
Mike