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Is there a front derailer type that can be mounted on a frame without braze on or fitting on the seat tube, or clamping?


Dia Compe Brakes for 1991 Bridgestone RB-TSRAM Rival front derailleur throws chain to the outside, even after professional adjustmentReplaced chain, bike makes grinding noise?Adding front derailleur vs upgrading the rear one on a (ladies) bicycleHave some new parts on hand but need new frame - frame swap reasonable? or sell and purchase new bike?What is wrong with my Shimano 105 5800 front derailleur?Is SLX FD 675-B front derailleur appropriate for my bike?Can and should I sell a bike without wheels?Is there a front derailer clamp diameter that is near 29.6 or 29.7mm?













3















As the question says, is there a front derailer type that can be mounted without having a fitting or braze on on the seat tube, or without clamping to the seat tube (because it's a weird shape, or made from a material that one cannot safely clamp too)?



To my knowledge there are clamp on derailer that expect a seat tube that is circular in cross section and braze on derailers that expect a brazed on fitting on the seat tube.



Finally there are derailers that are clamped on by the right hand bottom bracket cup/ring, but as far as I can tell they also require an additional fastening method on the seat tube to prevent them from rotating around the bottom bracket. I think these are sometimes called E-Type or Bottom Bracket derailers.










share|improve this question
























  • @Argenti Apparatus Derailer is fine: sheldonbrown.com/derailer.html

    – maxf130
    Mar 29 at 12:35












  • Roll my edit back if you wish

    – Argenti Apparatus
    Mar 29 at 12:51















3















As the question says, is there a front derailer type that can be mounted without having a fitting or braze on on the seat tube, or without clamping to the seat tube (because it's a weird shape, or made from a material that one cannot safely clamp too)?



To my knowledge there are clamp on derailer that expect a seat tube that is circular in cross section and braze on derailers that expect a brazed on fitting on the seat tube.



Finally there are derailers that are clamped on by the right hand bottom bracket cup/ring, but as far as I can tell they also require an additional fastening method on the seat tube to prevent them from rotating around the bottom bracket. I think these are sometimes called E-Type or Bottom Bracket derailers.










share|improve this question
























  • @Argenti Apparatus Derailer is fine: sheldonbrown.com/derailer.html

    – maxf130
    Mar 29 at 12:35












  • Roll my edit back if you wish

    – Argenti Apparatus
    Mar 29 at 12:51













3












3








3








As the question says, is there a front derailer type that can be mounted without having a fitting or braze on on the seat tube, or without clamping to the seat tube (because it's a weird shape, or made from a material that one cannot safely clamp too)?



To my knowledge there are clamp on derailer that expect a seat tube that is circular in cross section and braze on derailers that expect a brazed on fitting on the seat tube.



Finally there are derailers that are clamped on by the right hand bottom bracket cup/ring, but as far as I can tell they also require an additional fastening method on the seat tube to prevent them from rotating around the bottom bracket. I think these are sometimes called E-Type or Bottom Bracket derailers.










share|improve this question
















As the question says, is there a front derailer type that can be mounted without having a fitting or braze on on the seat tube, or without clamping to the seat tube (because it's a weird shape, or made from a material that one cannot safely clamp too)?



To my knowledge there are clamp on derailer that expect a seat tube that is circular in cross section and braze on derailers that expect a brazed on fitting on the seat tube.



Finally there are derailers that are clamped on by the right hand bottom bracket cup/ring, but as far as I can tell they also require an additional fastening method on the seat tube to prevent them from rotating around the bottom bracket. I think these are sometimes called E-Type or Bottom Bracket derailers.







derailleur parts derailleur-front






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Apr 1 at 9:21







maxf130

















asked Mar 29 at 12:23









maxf130maxf130

1586




1586












  • @Argenti Apparatus Derailer is fine: sheldonbrown.com/derailer.html

    – maxf130
    Mar 29 at 12:35












  • Roll my edit back if you wish

    – Argenti Apparatus
    Mar 29 at 12:51

















  • @Argenti Apparatus Derailer is fine: sheldonbrown.com/derailer.html

    – maxf130
    Mar 29 at 12:35












  • Roll my edit back if you wish

    – Argenti Apparatus
    Mar 29 at 12:51
















@Argenti Apparatus Derailer is fine: sheldonbrown.com/derailer.html

– maxf130
Mar 29 at 12:35






@Argenti Apparatus Derailer is fine: sheldonbrown.com/derailer.html

– maxf130
Mar 29 at 12:35














Roll my edit back if you wish

– Argenti Apparatus
Mar 29 at 12:51





Roll my edit back if you wish

– Argenti Apparatus
Mar 29 at 12:51










1 Answer
1






active

oldest

votes


















5














'E type' is a front derailleur attachment standard. Some frames provide an E type mounting point directly, some require a 'back plate' that provides the mount point that is clamped by the bb cup.



As far as I can tell, some back plates are clamped by the cup and have no other provision to prevent rotation. There is not very much fore or aft force on the derailleur so presumably this is not a problem. Other back plates have an additional hole that matches a threaded hole on the frame, so that an anti-rotation bolt can be fitted.






share|improve this answer























  • That makes sense. That would also explain the sometimes conflicting information about these things online.

    – maxf130
    Mar 29 at 13:02











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









5














'E type' is a front derailleur attachment standard. Some frames provide an E type mounting point directly, some require a 'back plate' that provides the mount point that is clamped by the bb cup.



As far as I can tell, some back plates are clamped by the cup and have no other provision to prevent rotation. There is not very much fore or aft force on the derailleur so presumably this is not a problem. Other back plates have an additional hole that matches a threaded hole on the frame, so that an anti-rotation bolt can be fitted.






share|improve this answer























  • That makes sense. That would also explain the sometimes conflicting information about these things online.

    – maxf130
    Mar 29 at 13:02















5














'E type' is a front derailleur attachment standard. Some frames provide an E type mounting point directly, some require a 'back plate' that provides the mount point that is clamped by the bb cup.



As far as I can tell, some back plates are clamped by the cup and have no other provision to prevent rotation. There is not very much fore or aft force on the derailleur so presumably this is not a problem. Other back plates have an additional hole that matches a threaded hole on the frame, so that an anti-rotation bolt can be fitted.






share|improve this answer























  • That makes sense. That would also explain the sometimes conflicting information about these things online.

    – maxf130
    Mar 29 at 13:02













5












5








5







'E type' is a front derailleur attachment standard. Some frames provide an E type mounting point directly, some require a 'back plate' that provides the mount point that is clamped by the bb cup.



As far as I can tell, some back plates are clamped by the cup and have no other provision to prevent rotation. There is not very much fore or aft force on the derailleur so presumably this is not a problem. Other back plates have an additional hole that matches a threaded hole on the frame, so that an anti-rotation bolt can be fitted.






share|improve this answer













'E type' is a front derailleur attachment standard. Some frames provide an E type mounting point directly, some require a 'back plate' that provides the mount point that is clamped by the bb cup.



As far as I can tell, some back plates are clamped by the cup and have no other provision to prevent rotation. There is not very much fore or aft force on the derailleur so presumably this is not a problem. Other back plates have an additional hole that matches a threaded hole on the frame, so that an anti-rotation bolt can be fitted.







share|improve this answer












share|improve this answer



share|improve this answer










answered Mar 29 at 12:51









Argenti ApparatusArgenti Apparatus

39k34097




39k34097












  • That makes sense. That would also explain the sometimes conflicting information about these things online.

    – maxf130
    Mar 29 at 13:02

















  • That makes sense. That would also explain the sometimes conflicting information about these things online.

    – maxf130
    Mar 29 at 13:02
















That makes sense. That would also explain the sometimes conflicting information about these things online.

– maxf130
Mar 29 at 13:02





That makes sense. That would also explain the sometimes conflicting information about these things online.

– maxf130
Mar 29 at 13:02

















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