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Old 07-20-07, 10:40 AM   #1
JosephLMonti
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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)???
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Old 07-20-07, 11:28 AM   #2
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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.
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Old 07-20-07, 11:56 AM   #3
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It's a little easier for me to remove and install the wheel with vertical dropouts, but not by much.
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Old 07-20-07, 12:38 PM   #4
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Originally Posted by Loch View Post
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):

Problem with a Xootr Swift

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.
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Old 07-20-07, 10:26 PM   #5
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Originally Posted by JosephLMonti View Post
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...?
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Old 07-21-07, 06:47 AM   #6
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I suppose you mean horizontal...?
oops, thanks for catching that...I do mean HORIZONTAL.
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Old 07-21-07, 02:48 PM   #7
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Originally Posted by rhm View Post
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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