theres a smallish, but still descernable, pic of a TA quad at:
http://www.bikecult.com/
its described there as a "tandem triple".
granted, not 4 drive chainwheels (tandem, right side linkage), but its still a quad...
cant tell if its set up with 2 outers or 3 inners...
-joel
>Roy Drinkwater wrote:
>>
>> Steve Kistler commented:
>>
>> >His [Bob Freeman] vast expertise advised me against trying to
>> >build a Quad TA crank! out of the Paramount's exising TA triple.
>> >How to make a TA quad crank??? Bob said expensive and rare
>> >parts? Suggestions?
>>
>> Well, it's just long bolts and spacers. Harvey Sachs has
>> probably done one. The major problem is that the smallest ring is
>> 26T.
>
>Not even extra long bolts, just two sets of regular TA triple bolts. I did
>one in about '77 for a front-drive tandem. I used two outer rings, which
>attached to the front and back of the 5-pin "spider" with double chainring
>bolts. Then two inner rings of course. One set of triple bolts went
>through the outer three rings at the 36-tooth bolt circle (sorry I don't
>know the BCD); the other set of triple bolts went through the inner three
>rings at the 26-tooth bolt circle. Made a very rigid and useful 26-56 tooth
>quad - the 56 was nice to have due to the 650b wheels on this bike. Had to
>do some drilling of course, the only tricky part.
>
>
>Mark Bulgier
>Seattle, Wa
>USA
>_______________________________________________
--
joel metz : magpie@messengers.org : http://www.blackbirdsf.org/
bike messengers worldwide : ifbma : http://www.messengers.org/
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==
i know what innocence looks like - and it wasn't there,
after she got that bicycle...