Advantages: Light, Strong, twice as strong as competitors, isis Disadvantages: non
The Evolve Series of BottomBracket from RaceFace Have an amazing Spec for the Price, There Retailing at Around £45 for something that is twice as strong as the competitors.
When I say Twice as strong this is because the The whole case has been shot penned to harden it and There are two sets of bearings in the drive side of the bottombracket to allow for great strain to be put on it, as your drive side takes the power to the chain. Plus a few other tricks to make it the strongest BB on the Market.
This makes it ideal for trials as the bash ring, when used pushes a lot of force onto the drive side arm of the bottombracket, causing pits in bearings in most BB. Raceface have gone a step further though as the bearing have been bought in and disassembled and the grease replaced with there own mix that is said to increase the life ...
I have had three or four of these because they were cheap, it turned out that in the long run it was cheaper to save up and buy a decent bottombracket. Everyone of these that I bought broke in under a month, the same two faults occured each time. 1) Mud and grit easily get past the seals and wear out the bearings causing them to cease or rattle. 2) The ends of the tapered arms round off very easily, even during light XC and commuting use I have rounded them off. Steer clear and buy a decent bottombracket, or even better get the new external type, or if your into jumping and DH get some 3piece cranks. ...
Advantages: Cheap, extremely durable, abuse tolerant Disadvantages: Poor crank choice, may not be suitble for extreme use
the others, and now the latest big thing are external bottombrackets. X-type from RaceFace, Hollowtech II from Shimano, and GXP from Truvativ. While they have different names they are all interchangeable, as they are all made to similar specifications and similar dimensions.
Each "improvement" has led to stiffer and lighter BB's, with a marked decrease in durability. The latest BB's can last as little as 3 months on a mountain bike, if ridden in wet and muddy conditions. ISIS are particularly bad in this regard, but the new external BB's are in a class all of their own. Mounting the BB outside of the frame, makes them extremely vulnerable to water penetration and early failure.
The UN54 will give you an average service life of around 18 months to 2 years, and this reason alone may be enough to persuade you to stick with square taper. My ...
Product Information for "Race Face XC/AM Bottom Bracket Cups" »
Product details
Long Name
XC/AM Bottom Bracket Cups
Type
Bottom Bracket
Genre
Bracket Cups
Manufacturer
Race Face
Manufacturer's product description
Race Face Deus/Atlas X Type BB Cups Specifications: Designed to be used with your Deus, Atlas or Evolve XC X-Type cranksets. Manufactured from high strength aluminum and featuring twice the number of ball bearings than our competitors, the Atlas BB cups are also compatible with Shimano\'s external system, making for a great upgrade. Forged and CNC Machined from 7050 aluminum. Tapering wall construction minimizes weight. Massive external bearings have 35% larger ball bearings than internal systems, yielding vastly improved durability. Double sealed cartridge bearings feature a special full-complement construction. This doubles the amount of ball bearings in the cartridge and effectively doubles the load carrying capacity of the bearing. Interchangeable with Shimano\'s XTR, XT and Saint BB cups. BUILT FOR: XC and All Mountain WEIGHT: 110g WARRANTY: One Year COLOUR: Black
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