amoryns Posted January 26, 2008 Posted January 26, 2008 ok so while riding this morning I saw the weirdest thing ever..tandem came past me...(not so weird), but when I looked t how they were pedalling I saw that the cranks were not connected..sorry this sounds stupid..dont know the technical naming....but anyway..the person in front's pedal strokes were not in unisan with the guy at the back. I have never seen this before...so reckon the guy at the back is driving the whole tandem forward???? How does this work?
fandacious Posted January 26, 2008 Posted January 26, 2008 ok so while riding this morning I saw the weirdest thing ever..tandem came past me...(not so weird)' date=' but when I looked t how they were pedalling I saw that the cranks were not connected..sorry this sounds stupid..dont know the technical naming....but anyway..the person in front's pedal strokes were not in unisan with the guy at the back. I have never seen this before...so reckon the guy at the back is driving the whole tandem forward???? How does this work?[/quote'] shhhhht!!! the pilot is making the stoker do all the work, and you're giving away his game!
Azonic Posted January 26, 2008 Posted January 26, 2008 I have seen something on the net before where the two riders can coast independently from one another... Probably ok for a social tandem on a flat route, but when you start cranking and especially standing it won't work at all. I've got a tandem and its tough enough getting a good 'stand' going.
Sammajoor Posted January 26, 2008 Posted January 26, 2008 I have seen something on the net before where the two riders can coast independently from one another... Probably ok for a social tandem on a flat route' date=' but when you start cranking and especially standing it won't work at all. I've got a tandem and its tough enough getting a good 'stand' going. [/quote'] and its tough enough getting a good 'stand' going this is just asking to be hi jacked
Guest Big H Posted January 26, 2008 Posted January 26, 2008 Antie Amoryntjie ekke hoop jy sal nou verstaan. Hoekom mense dit wil doen kan ek nie verstaan nie. Dit maak dit net meer complicated!!!!!! da Vinci's Independent Drive? The Independent Coasting Advantage da Vinci Designs? Independent Coasting System (ICS) offers you a riding experience both on and off road that equals or surpasses the best you?ve had on a single or tandem bike. The ICS makes for a far more intuitive, comfortable and efficient ride. This newfound ability to independently or collectively coast, pedal and position your cranks at will offers these advantages: Starting, stopping and going through corners are as easy as on a single bike. Captain and stoker can independently relax, take a drink, adjust seat position, stand for a few seconds to relieve weary sit bones, even take a moment to gaze at scenery, while the other keeps pedaling. Traversing obstacles is easier and more efficient because the captain and stoker can coordinate avoiding the obstacles while maintaining forward momentum. Asynchronous pedaling decreases strain on the final drive train.The main component of da Vinci Designs? ICS is an intermediate drive shaft six inches in front of the rear bottom bracket. The intermediate shaft has two single-speed freewheels on the left side that are independently driven by the cranks at twice the rotating speed and half the torque. On the right side of the shaft, four Hyperglide? cogs drive the bike. The chain rings are half the size as those on a conventional tandem because of the double rotation of the intermediate shaft. The combination of 12-, 18-, 24-, 30-tooth driving gears equals 24-, 36-, 48-, 60-tooth chain rings. The combination of the small 6-tooth gap, doubled rotation and the Hyperglide cogs gives da Vinci Designs? tandems these technical advantages: Smooth and fast front shifting ? The closer the chain rings are to the same size, the easier it is to shift. Other tandems, and even single bikes, are forced to use a 12-tooth gap between chain rings. Unprecedented range of gears ? Four chain rings and eight rear sprockets mean 32 gears that range from 18 to 140 gear-inches. No other tandem gives you that many gears or that kind of range. More ground clearance ? Nice when you lift your tandem over a curb, out of a truck, or when you are off road. Stronger, lighter chain rings that are less prone to bending Less strain on the chain while shiftingClick on the thumbnail for full size photo http://www.davincitandems.com/images/Drive-tn.jpghttp://www.davincitandems.com/images/drive2-tn.jpgBig H2008-01-26 08:09:41
lowracer Posted January 26, 2008 Posted January 26, 2008 vision also had something like that = IPS - Independant pedaling system. sadly they are no more.
Mauritzvw Posted January 26, 2008 Posted January 26, 2008 I have seen something on the net before where the two riders can coast independently from one another... Probably ok for a social tandem on a flat route' date=' but when you start cranking and especially standing it won't work at all. I've got a tandem and its tough enough getting a good 'stand' going. [/quote'] and its tough enough getting a good 'stand' going this is just asking to be hi jacked Maybe it is easier if you are the stoker
Azonic Posted January 26, 2008 Posted January 26, 2008 Standing on a tandem works wonders on a hill if you and the stoker are in sync with how you 'throw' the tandem sideways. If you get it right you rocket forward. Get it wrong, and you are riding a limp noodle. 2.... 1... UP.
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