I have a Gary Fisher Piranha (26) and the other spot is for whoever I'm riding with.

I haven't had a 29er on the rack but it should work for it.

Not sure that tandem would fit though! May need a WIDE LOAD sign lol

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12 X5 M - 06 X5 4.8iS - 03 X5 4.4i - 03 M5 - 02 X5 4.6is - 99 M3 Dinan S3 - 98 M3 - 92 850i-6 - 92 850i - 91 325ix - 89 M3 2.5 - and a few parts cars