/ Boardman Seat post clamp
I can't see why the depth would matter? Is it a road bike or a mountain bike?
Your best bet is going to be through boardman themselves as you are already limited by the carbon fibre to which clamp you can use, so to add another criteria to this you are really going to struggle.
Elsewhere on the site
In tonight's Friday Night Video, we see Alex Honnold soloing Heaven 5.12d in Yosemite Valley. The route starts 3000ft above the... Read more
This streamlined, midweight thermal layer has an incredibly speedy moisture wicking ability and dries ultra fast if it gets... Read more
October 21, 2014 – Textile Exchange, a global nonprofit dedicated to sustainability in the apparel and textile industry,... Read more