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Can I turn a clamp on FD into a braze on?

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Can I turn a clamp on FD into a braze on?

Old 08-22-13, 05:41 AM
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Can I turn a clamp on FD into a braze on?

My bike has a Shimano FD-1050 braze on front derailleur which is in need of replacement. My buddy has an FD-1050 in the clamp on version. Is it possible to just remove the clamp and use it as a braze on? Will the bolts line up? Sorry for the noob question, I just don't know a lot about this topic. Thanks.

Tom
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Old 08-22-13, 06:02 AM
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I don't think that with the FD1050 it is possible to convert from braze on to clamp on. If I remember correctly, it is riveted to the clamp.
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Old 08-22-13, 06:04 AM
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Tom, Short answer is yes as long as the clamp is the correct size. Maybe not a good plan if the frame is carbon fiber and on some bikes the clamp may interfere with the rear tire.

Brad
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Old 08-22-13, 06:36 AM
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In looking at several pictures of the clamp on version, it looks like the clamp is an integral part of the derailleur. The pivots mount to the clamp and the limit screws index against it, so it can't be removed.
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Old 08-22-13, 06:39 AM
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Not the answers I was hoping for, but thanks for the info!

Tom
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Old 08-22-13, 06:43 AM
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No, the clamp cannot be removed from the derailleur and be used as a brazed on type.

Yes, if you have a bike that uses 2 allen screws to attach the braze on mount onto the frame. You could remove this braze on clamp from the frame and clamp the derailleur over it.
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Old 08-22-13, 07:10 AM
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Originally Posted by bradtx
Tom, Short answer is yes as long as the clamp is the correct size. Maybe not a good plan if the frame is carbon fiber and on some bikes the clamp may interfere with the rear tire.

Brad
The real answer is no. You cannot convert a Shimano front derailleur to a braze-on configuration from a clamp-on configuration. In theory it is possible to make this conversion for some Campy front derailleurs if you can find the parts but not Shimano.

The only possible way to use the clamp-on fd is if all of the below conditions are met:

1. The clamp is the correct size
2. The braze-on tab can be removed with out damaging the frame
3. The seat tube is circular where the clamp will have to go.

Real short answer: buy a new braze-on front derailleur.
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Old 08-22-13, 08:22 AM
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Tom, I misread the original question. No, a clamp-on can't be converted to a braze-on. I also should have added that the braze-on tab needs to be removable.

Brad
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Old 08-22-13, 09:52 AM
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Originally Posted by Tpcorr
Not the answers I was hoping for, but thanks for the info!

Tom
Tom, I have a new-in-box braze-on RX100 front derailleur if you're interested in swapping.
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Old 08-22-13, 10:05 AM
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Since you can always use a separate conversion clamp, I've always wondered why they don't just make all FDs braze-on, and then just sell you the appropriate sized clamp if you need it.
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Old 08-22-13, 10:51 AM
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Originally Posted by caloso
Since you can always use a separate conversion clamp, I've always wondered why they don't just make all FDs braze-on, and then just sell you the appropriate sized clamp if you need it.
+1 It would certainly simplify the inventory requirements.
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Old 08-22-13, 02:22 PM
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Originally Posted by ThermionicScott
Tom, I have a new-in-box braze-on RX100 front derailleur if you're interested in swapping.
Thanks Thermionicscott, but the derailleur I have is not new, just less rusty than my current one. And thanks for all the thoughtful responses. The bike I'm putting it on is a 1987 Cannondale SR500 105. It has a lot of miles on it, and I just started riding it again. It's a boneshaker for sure, but every time I look at it I want to jump on and ride it! I'm sure I'll eventually find a FD 1050 braze on. And Thermionicscott, if you need that clamp on 105 derailleur, I'm sure my buddy would give it to me, and I could send it to you for whatever the shipping cost is. Just let me know using this thread, I don't have enough posts to pm someone.

Tom

Tom
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Old 08-22-13, 02:49 PM
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Originally Posted by Tpcorr
Thanks Thermionicscott, but the derailleur I have is not new, just less rusty than my current one. And thanks for all the thoughtful responses. The bike I'm putting it on is a 1987 Cannondale SR500 105. It has a lot of miles on it, and I just started riding it again. It's a boneshaker for sure, but every time I look at it I want to jump on and ride it! I'm sure I'll eventually find a FD 1050 braze on. And Thermionicscott, if you need that clamp on 105 derailleur, I'm sure my buddy would give it to me, and I could send it to you for whatever the shipping cost is. Just let me know using this thread, I don't have enough posts to pm someone.

Tom
Right on. I bought the wrong type off eBay for peanuts without scrutinizing it, so I'm hoping to find a good home for it eventually. Maybe I just need to buy another frame.
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Old 08-22-13, 05:01 PM
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Another no, just in case there was ANY doubt.....
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Old 08-22-13, 05:14 PM
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Originally Posted by HillRider
The real answer is no. You cannot convert a Shimano front derailleur to a braze-on configuration from a clamp-on configuration. In theory it is possible to make this conversion for some Campy front derailleurs if you can find the parts but not Shimano.

The only possible way to use the clamp-on fd is if all of the below conditions are met:

1. The clamp is the correct size
2. The braze-on tab can be removed with out damaging the frame
3. The seat tube is circular where the clamp will have to go.

Real short answer: buy a new braze-on front derailleur.
I don't doubt what you've written about more current Shimano front derailleurs. But.... my old-ish 6500 series (Ultegra 9 speed) front derailleur clamp on and braze on are the same units. The clamp is simply what is probably accurately called an adapter - you can actually simply remove the FD from the clamp and it's a braze on. I had a frame with the clamp on unit and got a new frame with a braze on bracket. I bought a braze on unit not knowing this fact, but then when I was removing the one, I noticed that I could have simply taken the clamp off to put it on the braze-on frame. Turns out I had use for them both a couple of years later so no harm.

But I have absolutely no knowledge of any other Shimano FD's though. Now I'm curious- I should look at my wife's Tiagra 9 speed FD to see if it's the same as the Ultegra 9 speed (6500).
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Old 08-22-13, 05:35 PM
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Originally Posted by Camilo
I don't doubt what you've written about more current Shimano front derailleurs. But.... my old-ish 6500 series (Ultegra 9 speed) front derailleur clamp on and braze on are the same units. The clamp is simply what is probably accurately called an adapter - you can actually simply remove the FD from the clamp and it's a braze on. I had a frame with the clamp on unit and got a new frame with a braze on bracket. I bought a braze on unit not knowing this fact, but then when I was removing the one, I noticed that I could have simply taken the clamp off to put it on the braze-on frame. Turns out I had use for them both a couple of years later so no harm.

But I have absolutely no knowledge of any other Shimano FD's though. Now I'm curious- I should look at my wife's Tiagra 9 speed FD to see if it's the same as the Ultegra 9 speed (6500).
You had a braze-on with a separate clamp. It was manufactured as a BO, even though Shimano made clamp on versions of the same derailleur. For one of several reasons, one of which was likely parts availability to the OEM bike company, your bike was fitted with a BO/adapter clamp set up.
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Old 08-22-13, 06:38 PM
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Originally Posted by Camilo
I don't doubt what you've written about more current Shimano front derailleurs. But.... my old-ish 6500 series (Ultegra 9 speed) front derailleur clamp on and braze on are the same units. The clamp is simply what is probably accurately called an adapter - you can actually simply remove the FD from the clamp and it's a braze on. I had a frame with the clamp on unit and got a new frame with a braze on bracket. I bought a braze on unit not knowing this fact, but then when I was removing the one, I noticed that I could have simply taken the clamp off to put it on the braze-on frame. Turns out I had use for them both a couple of years later so no harm.

But I have absolutely no knowledge of any other Shimano FD's though. Now I'm curious- I should look at my wife's Tiagra 9 speed FD to see if it's the same as the Ultegra 9 speed (6500).
As BikeWise1 explained, you have a braze-on front derailleur that was already mounted on an adapter clamp. True braze-on and true clamp-on versions of Shimano front derailleurs are not convertible with each other.
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Old 08-22-13, 06:53 PM
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Originally Posted by BikeWise1
For one of several reasons, one of which was likely parts availability to the OEM bike company, your bike was fitted with a BO/adapter clamp set up.
When I was building up my Klein, Shimano didn't offer the 1-3/8" clamp-on derailleur, so the only choice was the adapter. I think they only had two sizes of clamp-ons but several more versions of the adapters. It's a good system, but the clamp on and braze on derailleurs are the same price so the braze on derailleur plus adapter was about $15 more.
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Old 08-22-13, 07:31 PM
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Originally Posted by DiabloScott
When I was building up my Klein, Shimano didn't offer the 1-3/8" clamp-on derailleur, so the only choice was the adapter. I think they only had two sizes of clamp-ons but several more versions of the adapters. It's a good system, but the clamp on and braze on derailleurs are the same price so the braze on derailleur plus adapter was about $15 more.
When I bought my '96 Litespeed which has a 1-3/8" seat tube, Shimano, as you noted, didn't offer a suitable clamp-on fd since at the time the only cataloged clamp-on derailleurs were 1-1/8" and 1-1/4".

However they did make 1-3/8" clamp-on fd's as special parts exclusively for Trek. Fortunately my LBS was a Trek dealer and was able to finagle the special 105 8-speed triple I needed. At the time I also had them get me a spare which came labeled as an RX-100 part and I still have it in brand new, never installed condition.
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Old 08-22-13, 08:24 PM
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Why Bodge one up, when you can just buy a New one already done. for pretty cheap ..
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Old 08-27-13, 11:29 AM
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Originally Posted by BikeWise1
You had a braze-on with a separate clamp. It was manufactured as a BO, even though Shimano made clamp on versions of the same derailleur. For one of several reasons, one of which was likely parts availability to the OEM bike company, your bike was fitted with a BO/adapter clamp set up.
Originally Posted by HillRider
As BikeWise1 explained, you have a braze-on front derailleur that was already mounted on an adapter clamp. True braze-on and true clamp-on versions of Shimano front derailleurs are not convertible with each other.
yea, that's what I was trying to explain - that the clamp was a braze on adapter. It was a total Shimano unit though, fwiw. I guess I didn't know that they sold true clamp on units that weren't convertible. I'm just lucky I guess.
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Old 08-27-13, 11:48 AM
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Originally Posted by Tpcorr
Thanks Thermionicscott, but the derailleur I have is not new, just less rusty than my current one. And thanks for all the thoughtful responses. The bike I'm putting it on is a 1987 Cannondale SR500 105. It has a lot of miles on it, and I just started riding it again. It's a boneshaker for sure, but every time I look at it I want to jump on and ride it! I'm sure I'll eventually find a FD 1050 braze on. And Thermionicscott, if you need that clamp on 105 derailleur, I'm sure my buddy would give it to me, and I could send it to you for whatever the shipping cost is. Just let me know using this thread, I don't have enough posts to pm someone.
I'm fairly certain I have an extra braze-on 105 derailler from around that vintage (came off a 7 speed Cannondale road bike too which got a 9 speed specific FD to match its new chain/crankset). I'll check my parts bins tonight to confirm. We can figure out a deal then.
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