LOOK at this...drive shaft bike
#1
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LOOK at this...drive shaft bike
wen i saw that yesterday i went.......
mabe some off you no that stuff but i am sher a lot dont.
wow.no shain or belt..a drive shaft.
https://dekrabike.com/ddrive.htm
love it.
joco
mabe some off you no that stuff but i am sher a lot dont.
wow.no shain or belt..a drive shaft.
https://dekrabike.com/ddrive.htm
love it.
joco
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The concept has been around since the late 1800's and there was a commercial shaft drive bike put on the market by the Pope Bicycle Company in 1897. Nothing new.
The problems are weight, cost and lower efficiency.
The problems are weight, cost and lower efficiency.
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Sure, but D-Drive has a Shimano internal gear mechanism which arguably could be a benefit.
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If you do a search there have been a number of discussions on current shaft drive bikes, primarily Dynamic and Incline as I recall. Enough reported problems from some owners that I would be leery of buying one but that is just my personal opinion. It sounds to me like there are design/assembly problems that can cause failures in some instances on the current bikes.
Any shaft drive setup requires two bevel gear sets and these are much less efficient than a chain. Add in the losses in a internal gear hub and efficiency is going to suffer. I personally like IGH bikes but will stick with chain drive for them.
Any shaft drive setup requires two bevel gear sets and these are much less efficient than a chain. Add in the losses in a internal gear hub and efficiency is going to suffer. I personally like IGH bikes but will stick with chain drive for them.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
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Last edited by tatfiend; 04-26-09 at 12:31 AM. Reason: spelling error
#5
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As tatfiend noted, the shaft drive in inherently less efficient than a chain and a IGH is less efficient than a derailleur system. Double them up and the efficiency loss is appreciable.
A few months ago I got to briefly ride a Dynamic bike with a shaft drive and a Shimano 8-speed IGH. The resistance to pedaling was quite noticeable compared to a derailleur bike on the same road. Maybe it would have been ok if I hadn't been able to do an A-B test but the drag is there.