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Shimano SIS Derailleur Spacer Bolt?

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Shimano SIS Derailleur Spacer Bolt?

Old 08-23-20, 03:45 PM
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Shimano SIS Derailleur Spacer Bolt?

What is the secret to get the rear spacer and bolt that holds a shimano SIS rear derailleur to the frame of the bike? I have one that when installed, keeps the axle from going far enough into the drop-outs of the frame. It looks straight forward enough, but when I installed the tire after a flat repair I noticed one side was barely in the drop-out, don't want to ride it like that. Much appreciated.
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Old 08-24-20, 07:15 AM
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A picture would help. My brain is not picturing your problem. Roger
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Old 08-24-20, 10:51 AM
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Sounds like a claw type hanger. I believe that the axle will move forward in the dropouts when a claw type hanger is used.

John

Edit added: I’ll let the real mechanics offer the workarounds.

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Old 08-24-20, 02:37 PM
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Originally Posted by rhenning View Post
A picture would help. My brain is not picturing your problem. Roger
The derailleur is installed with the spacer as shown, it seems it does not leave enough room on the other side of the axle for it to drop in properly, I can't think of any other way that spacer goes in. The wheel is true and not dished as well.


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Old 08-24-20, 06:37 PM
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Sometimes there is a tapped hole behind the DO slot that the screw on the claw threads into. YOu could drill & tap the DO farther back for the screw or even eliminate it, but if eliminated the RD comes off every time you remove the wheel. Basically the screw is just there to hold it in until the wheel is tightened.
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Old 08-24-20, 08:17 PM
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The first photo shows the mounting plate (claw as others poorly term it) not fully slid into the drop out by enough. Note the sliver moon shaped gap at the plate's back edge where the securing bolt is located. remove the wheel. Loosen and slide back fully into the drop out slot the plate, tighten the plate's bolt (and specially shaped nut) so the plate and der don't slide forwards and reinstall the wheel. Andy
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Old 08-25-20, 04:29 AM
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Originally Posted by Andrew R Stewart View Post
The first photo shows the mounting plate (claw as others poorly term it) not fully slid into the drop out by enough. Note the sliver moon shaped gap at the plate's back edge where the securing bolt is located. remove the wheel. Loosen and slide back fully into the drop out slot the plate, tighten the plate's bolt (and specially shaped nut) so the plate and der don't slide forwards and reinstall the wheel. Andy
That's the rub with this set-up, the spacer is all the way back preventing the DR hangar from being moved back. I put the wheel in without that spacer and everything is fine, and the wheel fits in the drop-out. I suspect there is something about the orientation of that spacer (I have the flat toward the front of the bike). I'm sure there is an orientation or installation trick to these, I'm just not seeing it. Thanks for the replies.
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Old 08-25-20, 06:28 AM
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Can you provide photos of the plate (claw) face that contacts the drop out? Also the mounting bolt with it's special nut? Also the drop out slot? If the sliver of drop out slot I think I see is real then somehow the plate and nut are not being slid all the way up into the slot. We see this often enough hence my thinking about what's happening. Andy
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Old 08-25-20, 08:36 AM
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Make sure the fixing bolt for the claw is as far back in the dropout slot as possible. If it worked before, it should be able to work again.
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Old 08-25-20, 09:28 AM
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I see a gap. Pull the wheel off, loosen that spacer and move the crescent side all the way back and then tighten it down. You can also get spacers for the other side.
https://northwestbicycle.com/product...gaAnJyEALw_wcB
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Old 08-25-20, 04:45 PM
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Originally Posted by curbtender View Post
I see a gap. Pull the wheel off, loosen that spacer and move the crescent side all the way back and then tighten it down. You can also get spacers for the other side.
https://northwestbicycle.com/product...gaAnJyEALw_wcB
Thanks, thought I had this one figured out with the help of the pics, but no luck. Even with the spacer in its home position, it moves the rim too much forward in the DO. I'm sure someone has been stumped on these before, with these type set-ups. The only thing left to do to make this thing safe to ride is remove that hangar bolt, but I hate to cobble stuff like that.


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Old 08-25-20, 07:28 PM
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So I have to ask, was this frame equipped with a rear der OEM? Andy
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Old 08-26-20, 04:21 AM
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Originally Posted by Andrew R Stewart View Post
So I have to ask, was this frame equipped with a rear der OEM? Andy
All stock parts, I bought the bike new. I also checked the axle, it's straight. Very perplexing?
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