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-   -   Derailleur with horizontal dropouts (http://www.bikeforums.net/folding-bikes/323172-derailleur-horizontal-dropouts.html)

JosephLMonti 07-20-07 10:40 AM

Derailleur with horizontal dropouts
 
Question - if you can use both a derailleur and a hub gear system with horizontal dropouts, then what is the point of vertical dropouts (that don't allow the use of a hub gear system)???

rhm 07-20-07 11:28 AM

One drawback of horizontal dropouts is that if the QR or axle bolts aren't tight enough, the torque of pedaling can pull the right side of the axle forward, so the tire hits the frame on the left side. It is thus possible to ride a bike with vertical dropouts even if the rear wheel isn't properly installed. By some twisted logic, perhaps, this is intended as a safety feature.

But I don't know if that's the reason for them.

Loch 07-20-07 11:56 AM

It's a little easier for me to remove and install the wheel with vertical dropouts, but not by much.

JosephLMonti 07-20-07 12:38 PM

Quote:

Originally Posted by Loch (Post 4894412)
It's a little easier for me to remove and install the wheel with vertical dropouts, but not by much.

I assume that you say this b/c we generally use quick releases w/ vertical dropouts but not with horizontal dropouts...probably b/c a quick release is not strong enough to hold the axle in place against the force of pedaling. But what if someone were to put the axle all the way forward in the (horizontal) dropouts like this (post #10):

http://www.bikeforums.net/folding-bikes/315914-problem-xootr-swift.html

By doing this, there is no concern about the axle slipping forward b/c it in the most forward position already.

It just seems to me that vertical dropouts offer "the best of both worlds"...as in, hub gear system and derraileur option, like on the xootr swift.

jur 07-20-07 10:26 PM

Quote:

Originally Posted by JosephLMonti (Post 4894735)
It just seems to me that vertical dropouts offer "the best of both worlds"...as in, hub gear system and derraileur option, like on the xootr swift.

I suppose you mean horizontal...?

JosephLMonti 07-21-07 06:47 AM

Quote:

Originally Posted by jur (Post 4898074)
I suppose you mean horizontal...?

oops, thanks for catching that...I do mean HORIZONTAL.

nickbtoo 07-21-07 02:48 PM

Quote:

Originally Posted by rhm (Post 4894194)
One drawback of horizontal dropouts is that if the QR or axle bolts aren't tight enough, the torque of pedaling can pull the right side of the axle forward, so the tire hits the frame on the left side..

Something like a Surly Tugnut should solve that problem. It is also handy for removing the cap from your cold beverage.

Nick


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