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@Sanddancer
Maybe someone can help me before my head explodes. I have a bike with rigid forks with an IS mount and I'm running a Hope M4 caliper with a 203mm disc. All is well. Except I got a good deal on a bouncy fork and thought I'd see what all the fuss is about, but it turns out that the fork (RS Tora) has post mounts.
It seems that I'm in a tiny minority that have this problem whereas if I had it the other way round, I'd have adaptors up the ying yang to solve my issues.
The only thing I can find that seem to offer hope (pardon the pun) is this: http://www.activesport.co.uk/shop/article_569/Hope-Mount-Adaptor-Front-IS-to-Post-%2B20mm.html?shop_param=cid%3D1019%26aid%3D569%26
But I'm confused by the +20mm part. If the caliper mounts to a standard IS fork and takes a 203mm disc, would this adaptor move it out further so that it would want a 223mm disc? If so, why do they not make a regular adaptor that doesn't change the disc sizing?
I did come across this, http://www.discobrakes.com/?s=0&t=4&c=56&p=190, which seems to be what I need, but I'm in denial because of the fact it's almost 5 times more expensive than every other adaptor they have!