This is cross posted from the SS forum, where the posts for this eBB started out. (Review: Forward Components eBB for conventional BB shells)
Forward Components made an eBB that is retrofittable into most 68mm BB shells, which allows ~15mm of motion. I've been eyeing the similar Tr!ckstuff Exzentriker eBB for my FS Rohloff project, but had been bulking at the price - and in retrospec, I'm not sure the Exzentriker would clear the link on this frame.
I've had a Rohloff hub on my Haro Sonix without a tensioner using a magic ratio, but I'm stuck with a higher gear range than I like, and no way of adjusting for chain wear (except replacing the chain). The Sonix is one of the few suspension frames that have a fixed BB to dropout distance, allowing tensionerless setups with SS and IGHs. It also has a 73mm BB shell, which is recessed inside the concentric links:
The ID of the link is just shy of the Forward Components eBB cup, so to make the cup clear, I had to remove about 0.5mm from the base of the non-drive side cup.
The Drive side is not recessed, so that cup fits as is.
After installation, the cup looks like it actually belongs there:
Again, I'm using a FC-M532, which has an interface that can clear the larger cups without extra spacers, allowing this to be installed on a 73mm BB shell (FC only specs this eBB for a 68mm BB shell). The chain stays on this frame have lots of clearance around the cups to access the set screws, even if the setscrew lines up with the cs.
Original Post from Forward Components announcing the eBB:
Another eccentric bottom bracket for standard frames.
Original post for Haro Sonix with Rohloff:
Sonix and Rohloff
On another note, I recommend that you check the credentials of the mechanics tuning your suspension.
"...you have too much rebound..."
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Thread: Rohloff, Haro, retro-fitted eBB