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I'm thinking of doing one...
Kona A, had a pivot concentric with the bottom bracket therefore no chain growth. If there's any left, it was a few years back...
Kona ?Cowan? does the concentric pivot too
You could go for a frame that pivots around the BB like a Kona Bass or A Cove somethingorother. With these theres no chain growth(?) so tensioning the chain isnt a problem
I've seen it done on an orange patriot too, theres a topic on SDH about it. Think he used a rear mech and part of a chain guide to tension the chain.
Cant be arsed writing anymore now but if theres more questions, fire away
just needs a bouncy fork
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Had a couple of Cowan DS frames (predecessor to the Bass) and a Kona A. Shock with lock-out is a godsend (used RP3 and RP23 on the Cowan and Vanilla RL on the A).
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I've got a mate who runs a Kona A with a manitou SPV air shock which seems to work for him. It goes up hills faster than my inbred anyway....
Why?
ignore the "why's" i loved my "A"
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i miss it, i love the 05 version of the A frame shame no one imported it.
your best option is the Cowan frame above.
If the why is directed at me...
Its because I want another bike.
What about tensioners? Yess??
I always fancied ssing a trek y bike - one if the carbon ones. Or a Klein Mantra
Surely if you run a tensioner chain growth isn't an issue (as long as it's adjusted right), so you could use any frame. Probably a tensioner with two wheels (like a non-shifting derailleur) would be better.
On the A and Cowan there is no chain growth as it rotates around the BB..
no need for a tensioner.
Nor on the trek or Kleins I mentioned which are urts