BH RS1 Derailleur Hanger: Match the 2026 Model Code to the Part Reference
A BH RS1 derailleur hanger search needs the bicycle’s model code. The 2026 RS1 manual shows different part references within the family: LA556 is paired with 391780000, while LA506, LA456, LA406 and LA356 are paired with 391780100. The RS1 name alone does not select one of them.
Use the BH RS1 derailleur hanger model list
Page 12 places both references beside the hanger drawing and the applicable model codes. Read the reference and model label together. A parts search that returns a photograph with “fits BH” has not yet answered the model-specific question shown by the manufacturer.
Have the seller or workshop identify the original bicycle code from its records. Record the frame identity as well as the currently installed derailleur. Changing a rear derailleur during ownership does not, by itself, identify which frame attachment belongs to the bicycle.
Distinguish the hanger from the front derailleur bracket
The manual treats the rear hanger and front derailleur bracket as separate assemblies. They occupy different locations and have their own parts records. Include a photograph of the affected area in a replacement enquiry so that the dealer knows which component you need.
Ask it to confirm the actual replacement reference against the frame, its version and the existing part. Keep the packaging or invoice after fitting. That makes the next enquiry more precise and avoids repeating the search from the brand name alone.
Check the bicycle after the incident that prompted the search
A replacement hanger enquiry often follows an impact or a shifting problem. Matching a part number does not establish whether other parts require attention. Explain what happened and have the workshop assess the complete affected assembly before returning the bicycle to use.
This is a guide to reading the manufacturer’s reference split, rather than an installation or alignment procedure. The two listed references are not presented here as interchangeable. An RS1 from another year needs its own document and a fresh check of the actual frame.
FAQ
Which reference is shown for LA556 in the 2026 manual?
The drawing pairs LA556 with 391780000.
Which listed models use the other reference?
LA506, LA456, LA406 and LA356 are paired with 391780100.
Does the RS1 family name identify a universal hanger?
No. The manual itself makes a model-code distinction.
Put the model code beside the hanger reference in your parts record. Further BH equipment reading and the brand background help place the RS1 within its wider road range.
Primary references: BH manufacturer manual 1 (https://www.bhbikes.com/download/bancorecursos/manuales/ENG/2026/2026_RS1_ENG_USER_MANUAL.pdf).
Photograph credits and permissions
Photograph 1
Original title: BH G6
Creator: Glory Cycles; creator URI: https://www.flickr.com/photos/glorycycles/
Original source URI: https://www.flickr.com/photos/glorycycles/14245137842/
License / permission: CC BY 2.0
License / permission URI: https://creativecommons.org/licenses/by/2.0/
Modification notice: Original JPEG bytes unchanged.