![The o-ring found between the chainring and lockring on Bosch G4 systems is missing with my e*spec ring. Is that correct? – ethirteen support The o-ring found between the chainring and lockring on Bosch G4 systems is missing with my e*spec ring. Is that correct? – ethirteen support](https://support.ethirteen.com/hc/article_attachments/360082068711/Bosch_o-ring.jpg)
The o-ring found between the chainring and lockring on Bosch G4 systems is missing with my e*spec ring. Is that correct? – ethirteen support
![Bosch Lock Ring Tool - BDU2XX (Active Line, Performance Line, Performance Line CX) - Electric Cyclery Bosch Lock Ring Tool - BDU2XX (Active Line, Performance Line, Performance Line CX) - Electric Cyclery](https://www.electriccyclery.com/wp-content/uploads/2019/03/bosch_lock-ring-tool.jpg)
Bosch Lock Ring Tool - BDU2XX (Active Line, Performance Line, Performance Line CX) - Electric Cyclery
![Amazon.com : Full Speed Ahead FSA Bosch Boost148 E-Bike Lockring - 32700034000010 : Sports & Outdoors Amazon.com : Full Speed Ahead FSA Bosch Boost148 E-Bike Lockring - 32700034000010 : Sports & Outdoors](https://m.media-amazon.com/images/I/41iiHj-f8kL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : Full Speed Ahead FSA Bosch Boost148 E-Bike Lockring - 32700034000010 : Sports & Outdoors
![Amazon.com : BOSCH Outil de vélo électrique lockring Spider Tool Active et Performance moteur : Sports & Outdoors Amazon.com : BOSCH Outil de vélo électrique lockring Spider Tool Active et Performance moteur : Sports & Outdoors](https://m.media-amazon.com/images/I/51qMESizReL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : BOSCH Outil de vélo électrique lockring Spider Tool Active et Performance moteur : Sports & Outdoors
![Park Tool Lockring Tool Bosch Gen 2 LRT-1 - Reviews, Comparisons, Specs - Tools & Tool Kits - Vital MTB Park Tool Lockring Tool Bosch Gen 2 LRT-1 - Reviews, Comparisons, Specs - Tools & Tool Kits - Vital MTB](https://p.vitalmtb.com/photos/products/32711/photos/1882136/LRT-1_001.jpg?VersionId=SHYI1ttGg390.Jrbne.fFRWIHYejjm4O)
Park Tool Lockring Tool Bosch Gen 2 LRT-1 - Reviews, Comparisons, Specs - Tools & Tool Kits - Vital MTB
![Park Tool Lockring Tool Bosch Gen 2 LRT-1 - Reviews, Comparisons, Specs - Tools & Tool Kits - Vital MTB Park Tool Lockring Tool Bosch Gen 2 LRT-1 - Reviews, Comparisons, Specs - Tools & Tool Kits - Vital MTB](https://p.vitalmtb.com/photos/products/32711/photos/1882156/LRT-1_005.jpg?VersionId=w1uNeFmE7ek1kcC5pZJC96Q9R.9u0oOO)
Park Tool Lockring Tool Bosch Gen 2 LRT-1 - Reviews, Comparisons, Specs - Tools & Tool Kits - Vital MTB
![Amazon.com : TB-1067 Lockring tool for Bosch Active and Brose, 1/2" Socket/24 mm wrench : Sports & Outdoors Amazon.com : TB-1067 Lockring tool for Bosch Active and Brose, 1/2" Socket/24 mm wrench : Sports & Outdoors](https://m.media-amazon.com/images/I/61AAqEGlikL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : TB-1067 Lockring tool for Bosch Active and Brose, 1/2" Socket/24 mm wrench : Sports & Outdoors
![eBike Motor Centre (Performance Line Bearings) - Bosch Gen 3 Lockring tool, sprocket nut tool. Part No PLA00929 eBike Motor Centre (Performance Line Bearings) - Bosch Gen 3 Lockring tool, sprocket nut tool. Part No PLA00929](https://www.ebikemotorcentre.com/wp-content/uploads/2021/11/Bosch-Brose-Spider-Tool-3-600x400.jpg)