Why are the sprockets on the crank inverse from the sprockets on the cassette?
02-23-09, 03:18 PM
#26
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Well don't I feel like the schmuck for my chamois comment. Thats a very sweet picture (says I the father of 3 little girls).
02-23-09, 06:03 PM
#27
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If you start from the frame and count outwards, the cassette goes large gear, smaller gear, smaller gear, etc. On the crank, assuming you have a double or a triple, they go smaller, larger, larger.
I know there is a good and probably obvious reason, but I am not mechanical enough to figure it out by intuition. Could someone please tell me?
Thanks.
I know there is a good and probably obvious reason, but I am not mechanical enough to figure it out by intuition. Could someone please tell me?
Thanks.
On the rear, the larger tooth cog is lower gear and the lower tooth cog is high gear.
In other words:
INBOARD (front and rear) = Lowest gear ratio = straight(est) chain line
OUTBOARD (front and rear) = Highest gear ratio = straight(est) chain line
Flipping one over to "look" the same would cause cross chaining in the "normal" gear selections.
02-23-09, 06:06 PM
#28
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Co-Motion makes a conventional 700c wheel tandem frame that has a three piece telescoping stoker seatpost. It will compress and extend over a huge range and allow kids to stoke without a kidback but will also accomodate full size adults. Truly a "one size fits all" tandem.
02-23-09, 11:28 PM
#29
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Not germane to chain line but many old tandems from the 1890s or so did have the lady up front as the old rules of courtesy included "ladies first". Most such setups included remote steering so that the stoker could steer the bike. Many had both capable of steering so that the strongest presumably won! Usually set up so the stoker had a higher saddle to look over the head of the captain. Added complication to meet the requirements of Victorian etiquette.
Never had the guts to try it, though. I wonder if it's still there, considering the shop has moved around the corner: https://www.insiderpages.com/b/3711097983
Here's a picture of an 1896 version:
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