Shimano Bottom Bracket BB ES51 BB-ES51 113 x 73 Splined

Description

Shimano BB-ES51 Sealed Cartrige Bearing Splined BottomBracket

Description
-Octalink BB interface
-Oversized BB spndle
-113mm Spindle Length
-Hollow Chrome-Moly Steel Spindle Material
-OCTALINK splined axle crank arm interface
-Sealed cartridge assembly
-Threading: BSC English
-Mfg weight: 262g
-Shell Width: 73mm
– Spindle Length:113mm

UPC: 689228132184

Bottom Brackets:
A bottom bracket has to fit both your chainset and your frame. Thereare currently four chainset/bottom bracket interfaces that you’relikely to come across. If your chainset is made by Shimano and it hassplines, then you need an Octalink bottom bracket. If your chainset isNOT made by Shimano and it has splines, it’s almost certainly ISIS.There are a very few non-Shimano chainsets with Shimano Octalinkinterfaces so, to be sure, count the splines – ISIS has 10, Octalinkhas 8. No matter which brand of chainset you have, if it has a squareinterface, it will require a traditional square taper bottom bracket.If you have one of the new Hollowtech II systems, you will need tochoose the exact bottom bracket that matches your chainsets.

The other information you’ll need is the shell width and axle length.To find the shell width, measure the distance accross the outside ofthe bottom bracket tube on the frame. Correct axle length is crucial toyour chain line and the function of your front derailleur. It is veryhard to determine without reference to the bottom bracket supplied withthe frame. In short, the easiest way to work out what shell width andaxle length you require is to choose the same as was originally fittedto the frame although, if you’re changing chainset at the same time,this may not be perfect! Stick to the same interface type and brand andyou should be OK.