Here’s the modifications I made to a Speedbone so I could use a Rohloff on a Chameleon and a Gary Fisher Rig.
The problem is that the outer face of the caliper mounting is not flat, the bolts are recessed.
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Picture 011[/url] by Vegan Graham[/url], on Flickr
I hacksawed, drilled and Dremelled the aluminium away, then made two steel spacers to locate in the recessed bolt holes.
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Picture 012[/url] by Vegan Graham[/url], on Flickr
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Picture 013[/url] by Vegan Graham[/url], on Flickr
Nothing special, but it may help someone else who’s faced with the same problem.