NSK 6903 DD 17x30x7 61903 Fully Contacting Seal [GENUINE BEARING]
- CN normal clearance
- P6/P6 tolerances on inner and outer rings
- Excellent grease retention requires little maintenance
- Premium Tier 1 supplier
NSK are an OEM supplier to Shimano and SRAM. Their bearing technology and specifically material technology is high regarded and amongst the best in the world. NSK is the largest bearing manufacturer in Japan and second largest in North America.
These bearings are genuine NSK bearings sourced from NSK in Newark England. They are not counterfeit or B grade stock.
Q. What is the best bearing brand?
NTN, NSK, FAG and SKF are all quality bearing suppliers and their products meet ISO/JIS/DIN standards. When selecting a bearing it is important to ensure that the bearing fits correctly within the enclosure. Far eastern bearings sold on ebay or amazon are often out of specification in one or multiple parameters, these fit issues manifest themselves as creak or poor bearing life. Some sellers have been known to sell fake bearings which are very difficult to spot without specialized measuring equipment, fitting these usually presents the same problems. In short, fitting genuine branded bearings is recommended
Q. Which seals do you recommend?
For road racing, NTN LLB series, SKF RZ series and NSK VV series are recommended. For inclement weather or extended life, NTN LLU series, SKF 2RS series, NSK DD series or FAG 2RS series are recommended
Q. Which bearings have the lowest friction?
NTN LLB series followed by NSK VV series, SKF RZ series and then FAG BRS series
Q. How many bearings is this listing for?
All bearings on this website are sold in Singles unless otherwise stated
|Inside Diameter (mm)||17|
|Outer Diameter (mm)||30|
|Alternative Part Numbers||6903 2RS 6903 LLU 6903 LLB 6903 2RZ 6903 VV 6903 DD 6903 2RSR 6903 HRS 61903 2RS 61903 LLU 61903 LLB 61903 2RZ 61903 VV 61903 DD 61903 2RSR 61903 HRS|