I'm considering upgrades to the tandems we use for riding with the kids, and wondering about my crank length options. I might have to buy another pair of crank shorteners, but I'm not crazy about them as a solution because the space the pedals out so far for an already short rider. Who sells stoker cranks in short lengths? Are there any inexpensive options out there? Sometimes I think it might be cheaper to buy two inexpensive road cranks and go single side drive.
650B tandem converted from Santana Arriva, Santana Noventa, Boulder Bicycle 700C, Gunnar Sport, Trek TX700,
This is a wild idea but I would look into Mini BMX cranks. They are made from 135mm maybe even shorter and some run on Square taper BBs. If you can find some with removable spiders then you can add a spyder to the sync side.
Also look at the recumbent forum because some of those guys like really short cranks.
2015 Apollo Syncro tandem, 2006 Scott CR1 SL (still a beastie race bike), 1993 Trek T200, 2006 Fuji Absolute Le, 2000 Thorn Club Tour
St John St Cycles/Thorn in the UK sometimes have a good range. I have seen short double-drilled stoker triple cranks for sale on their website over the last couple of years. The prices are not hideous but in my experience they do not normally choose the most cost-effective postage options available.
This is a wild idea but I would look into Mini BMX cranks.
Actually, I'm already using BMX cranks on the rear of my Bike Friday tandem, and they are a great solution. In particular, there's a crank made by Sinz that comes in sizes from about 130 to 170mm for square taper and ISIS bottom brackets, they fit 110 mm BCD chainrings, and they can be found for $60 or less online. They are great for tandems on which you don't have a front derailleur (mine uses SRAM DualDrive). In the case of a bike with a front derailleur, I'm not sure whether the BMX cranks would work or not, but it looks like Origin8 makes a 155mm triple that's inexpensive. Unfortunately on many newer tandems, I probably also have to buy a bottom bracket to go with it, but it may be a good option until the kids' legs get a little longer.