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Horizontal dropouts different lengths

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Horizontal dropouts different lengths

Old 06-04-17, 12:43 PM
  #1  
robxcarlson
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Horizontal dropouts different lengths

So, I'm posting several questions about this vintage stump jumper I'm working on.

This question is about rear horizontal dropouts: when I set the wheel all the way back it is twisted towards the left and rubs the chain stay. The paint is worn away there so it may have been a problem for the previous owner.
I know I can center it, but I was wondering about this so I measured the dropout lengths and this isn't scientific but the drive side seems to be about 23mm and the left side 27mm... That would explain the wheel not aligning, but I flipped the wheel around and installed it with cogs to the left and it centers when I pull it all the way back in the dropouts.
Is this a problem with wheel dish? I know I need to get the wheel trued and I have a bent spoke on the drive side so I'm taking the wheel to the LBS, but is dish something they'll check as well? Will they need the bike for a reference?
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Old 06-04-17, 12:58 PM
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79pmooney
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When you go to the bike shop, mention the dish. They will not need your bike.

Sounds like your dropouts are not lined up fore and aft, ie that on is forward of the other. That matters very little with horizontal dropouts. With vertical it does as this relates to the wheel centering in the brakes and there is not much adjust (play) to correct poor vertical alignment.

It is normal to have the wheel roughly in the center of the dropout. This usually gives the best position of the gear cluster relative to the rear derailleur.

Tell us what kind of bike you have, pictures if you can and we can help you more.

Ben
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Old 06-04-17, 12:59 PM
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davidad
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The horizontal drop-outs on my Herons have adjustment screws that align the rear wheel with the chainstays.


https://www.modernbike.com/product-2126202851


It also sounds like you have a dish problem with the wheel.
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Old 06-04-17, 01:04 PM
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robxcarlson
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Originally Posted by 79pmooney View Post
When you go to the bike shop, mention the dish. They will not need your bike.

Sounds like your dropouts are not lined up fore and aft, ie that on is forward of the other. That matters very little with horizontal dropouts. With vertical it does as this relates to the wheel centering in the brakes and there is not much adjust (play) to correct poor vertical alignment.

It is normal to have the wheel roughly in the center of the dropout. This usually gives the best position of the gear cluster relative to the rear derailleur.

Tell us what kind of bike you have, pictures if you can and we can help you more.

Ben
It's an '88 stump jumper. I can take pics if you'd like. But I'm going to start with the wheel truing so that I know that's not a problem.
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Old 06-04-17, 01:59 PM
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I've seen a lot of bikes with the left dropout "deeper", including my 86 Rockhopper.
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Old 06-04-17, 02:06 PM
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Originally Posted by Bill Kapaun View Post
I've seen a lot of bikes with the left dropout "deeper", including my 86 Rockhopper.

+1... the horizontal rear dropouts are usually a different depth to ALLOW proper alignment of the wheel.

and get that wheel dish checked/corrected. have the front wheel checked, too.
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Old 06-04-17, 02:27 PM
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I got an old SJ Sport and replaced both because 1 was broken, with Campags longest horizontal dropout..

25 years ago ... its been fine ..

I have a left dropout deeper, vertical , for the Rohloff hub , on a different bike ...

axle drops in first, torque stop follows..





...
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