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I enjoy tandems. I have owned a 1940's Schwinn Town and Country, purchased a New 1971 double men's Paramount tandem, and have a mint condition Schwinn Mini Twin.
Only a single hand full of all the tandems pictured in this 12-page topic, have crank arms that are NOT in sync. I'm wondering if any of you guys that are tandem fans have any experience riding tandems with the cranks both "in sync" and "out of sync". You can ride a tandem with NO HANDS if the cranks are adjusted so the power stroke comes staggered every 90 degrees. This observation was brought back to my memory from reading the Bill McCready (Mr. Santana Tandem) Bicycling Tandem article in this post. Several of the five tandems they road tested had the cranks adjusted "out of sync". There's a lot of good stuff in this article.
John
Sorry.........Not what I'm talking about.-----
wrt to chainset registration -
homebuilts constructed by joining two singles typically exhibit a measure of mis-registration due to the lack of an eccentric bottom bracket
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