BEARINGS
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A BRIEF GUIDE TO BEARINGS
http://faq.ninja250.org/wiki/A_brief_guide_to_bearings
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HOW TO MEASURE A BEARING ;
INFO FROM BEARING KING .CO.UK
http://www.bearing-king.co.uk/how-to-measure-a-bearing.php
Info below was copied from the excellent website ;
How to measure a bearing
Sometimes you may need to identify a bearing due to general wear and tear.
Most bearing references now are laser stamped but these wear and rub off more quickly than the previous method, which was engraved deep in the bearing's metal.
Bearing Sizes
Each bearing has an inside diameter, outside diameter and width diameter in that order.
Most bearings are metric in size, but can also be imperial.
On our site, each bearing shows its principal dimensions.
d = Inside diameter
D = Outside diameter
B/T = Width diameter
You can search for a bearing entering this information on the home page in the boxes provided.
Once you have identified the bearing's code some bearings come complete with seals or shields. This is known as the suffix in the bearings reference.
Bearing Example
6205 2RS1C3
The bearing type design that you need is a single row deep groove ball bearing with the following dimensions and suffix.
d = 25mm
D = 52mm
B/T = 15mm
Result = 6205
The bearing also has a seal either side of the bearing.
2RS1 = 2 Rubber seals
2RSR = 2 Rubber seals
DDU = 2 Rubber seals
2Z = 2 Metal shields
ZZ = 2 Metal Shields
Result = 6205 2RS1
And the internal clearance being C3 means that the bearing has room for expansion if needed between the races of the bearing, whilst holding the outer ring and moving the inner ring in a radial movement you will detect a little amount of play between the 2 rings. All standard clearance bearings have this movement, it may only be a small amount of movement but is controlled by international standards.
C3 means the bearing has more clearance than standard.
For example we may use C3 clearance on bearings where a cold start up application my cause the balls to heat up quickly, the heat needs to go somewhere. Some of the heat gets passed through the outer race to the housing and the inner race to the shaft, this causes expansion which closes up the clearance in the bearing. If you did not allow for this clearance the bearing would not have room for expansion and lead to bearing failure.
C2 = Clearance less than normal
C3 = Clearance greater than normal
C4 = Clearance greater than C3
Result = 6205 2RS1C3
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BEARING DATA CODES ;
INFO FROM BEARING KING .CO.UK
http://www.bearing-king.co.uk/bearing-data.php
Info below was copied from the excellent website ;
Bearing Data
Bearing codes need not be a puzzle
Here we will try & explain some of the bearing data that could help you have a better understanding of what at first might just look like a bunch of numbers,
We will start with the most common asked questions,
Bearing Suffixes:
Suffixes are used to identify designs or variants which differ in some way from the original design, or which differ from the current standard design, each bearing manufacture have there own suffix & this is where it becomes a little confusing,
The most commonly used suffixes are listed below,
Suffix ; ....... RS , LU , DU , RSR , E
Type ; ........ Bearing with one rubber seal
Example ; .. 6205 LU
Suffix ; ........ 2RS , 2RSH , 2RS1 , LLU , DDU , 2RSR , EE
Type ; ........ bearing with two rubber seals
Example ; ... 6205 LLU
Suffix ; ........ Z , ZR
Type ; ......... bearing with one metal shield
Example ; ... 6205 ZR
Suffix ; ........ 2Z , 2ZR , ZZ
Type ; ......... bearing with two metal shields
Example ;. .. 6205 2Z
Suffix ; ........ NR
Type ; ......... bearing with snap ring groove & snap ring
Example ; ... 6205 NR
Suffix ; ........ RSNR
Type ; ......... bearing with one rubber seal & snap ring groove with snap ring
Example ; ... 6205 RSNR
Suffix ; ....... 2RSNR , 2RS1NR , 2RSHNR , 2RSRNR , LLUNR , DDUNR , EENR
Type ; ........ bearing with two rubber seals & snap ring groove with snap ring
Example ; ... 6205 2RS1NR
Suffix ; ........ 2ZNR , ZZNR , 2ZRNR
Type ; ......... bearing with two metal shields & snap ring groove with snap ring
Example ; ... 6205 2ZNR
Suffix ; ........ ZNR
Type ; ......... bearing with one metal shield & snap ring groove with snap ring
Example ; ... 6205 ZNR
Suffix ; ........ M , MA , MB , ML , MP , BR
Type ; ......... bearing with brass cage
Example ; ... 6318 MA
Suffix ; ........ ETN9 , TNH , TN , ETVP2 , TN9 , ETVP , TVP , ECP , E.G15 , ET , ETN , ET2X
Type ; ......... bearing with polymide plastic cage
Example ; ... N205 ETN9
Suffix ; ........ C2 , F3
Type ; ......... bearing with internal clearance smaller than normal
Example ; ... 6205 C2
Suffix ; ........ C3 , J30 , F4
Type ; ......... bearing with internal clearance greater than normal
Example ; ... 6205 C3
Suffix ; ....... C4
Type ; ........ bearing with internal clearance greater than C3
Example ; ... 6205 C4
Suffix ; ........ C5
Type ; ......... bearing with internal clearance greater than C4
Example ; ... 6205 C5
Suffix ; ....... GJN
Type ; ........ bearing with high temp grease -30 to +150 ºC
Example ; ... 6205 GJN
Suffix ; ........ HT
Type ; ......... bearing with high temp grease -40 to +150 ºC
Example ; ... 6205 HT
Suffix ; ........ WT
Type ; ......... bearing with high temp grease -40 to +160 ºC
Example ; ... 6205 WT
Suffix ; ........ VL0241
Type ; ......... bearing with aluminium oxide coated outside surface of the outer ring for electrical resistance up to 1000 V DC
Example ; ... 6317 MC3VL0241
Suffix ; ........ VL2071
Type ; ......... bearing with aluminium oxide coated outside surface of the inner ring for electrical resistance up to 1000 V DC
Example ; ... 6324 C3VL2071
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WHEEL BEARING ; SIZE and PART NUMBER ;
To Fit Earlier 10 inch wheel ROBIN / RIALTO models
RELIANT PART NUMBER ; 24170
BEARING IDENTIFIER ; LJ1 2RSJ C3 RHP
Where LJ1 is a Single Row Ball Bearing with the following Dimensions
Outside Diameter .. = 57.15mm { 2 and 1/4 inch }
Inside Diameter .... = 25.4mm { 1 inch }
Width ................... = 15.88mm { 5/8 inch }
Where 2RSR { or 2RS1 } means that the Bearing has a Rubber Seal on both sides
Where C3 means that the Bearing has More Clearance Than Standard
TYPE ............................ MANUFACTURER ..... PART NUMBER
LJ1 2RS C3 RHP ............................ RHP ................... LJ1 2RS C3 RHP
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WHEEL BEARING ; SIZE and PART NUMBER ;
To Fit Later 12 inch wheel ROBIN / RIALTO Mk2/Mk3 models
RELIANT PART NUMBER ; 29501
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BEARING IDENTIFIER ; 6305 - 2RSR - C3
Where 6305 is a Single Row Deep Grooved Ball Bearing with the following Dimensions
Outside Diameter .. = 62mm
Inside Diameter .... = 25mm
Width ................... = 17mm
Where 2RSR { or 2RS1 } means that the Bearing has a Rubber Seal on both sides
Where C3 means that the Bearing has More Clearance Than Standard
TYPE ................................ MANUFACTURER ..... PART NUMBER
6305 - 2RSR - C3 ................ SKF ....................... 6305 - 2RS1/C3
6305 - 2RSR - C3 ................ FAG ....................... 6305 - 2RSR - C3
6305 - 2RSR - C3 ................ KOYO ..................... 63052RSC3
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.FRONT HUB TAPER ROLLER BEARINGS
It would appear that the Front Hub Taper Roller Bearings fitted to the Robin and Rialto 3 wheelers are also fitted to the 4 wheeled Kitten models .
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LARGE BEARING CUP & CONE SET ; IMPERIAL
BEARING L44649 + CUP L44610
DIMENSIONS ........ IMPERIAL ........... METRIC
INSIDE DIAMETER ; ..... 1.0625 inch .............. 26.99 mm
OUTSIDE DIAMETER ; .. 1.198 inch ................ 50.29 mm
WIDTH ; ........................ 0.56 inch .................. 14.22 mm
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SMALL BEARING CUP & CONE SET ; IMPERIAL
BEARING LM11749 + CUP LM11710
DIMENSIONS ........ IMPERIAL ........... METRIC
INSIDE DIAMETER ; ..... 0.6875 inch .............. 17.46 mm
OUTSIDE DIAMETER ; .. 1.57 inch .................. 39.88 mm
WIDTH ; ........................ 0.545 inch ............... 13.84 mm
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